ºÝºÝߣshows by User: FabienLeonard / http://www.slideshare.net/images/logo.gif ºÝºÝߣshows by User: FabienLeonard / Mon, 16 Nov 2020 04:08:12 GMT ºÝºÝߣShare feed for ºÝºÝߣshows by User: FabienLeonard An Innovative Use of X-ray Computed Tomography in Composite Impact Damage Characterisation /slideshow/an-innovative-use-of-xray-computed-tomography-in-composite-impact-damage-characterisation/239274277 eccm16-201116040812
This study presents how X-ray computed tomography (CT) can be employed to obtain a more complete 3-dimensional description of damage in carbon fibre reinforced polymer (CFRP) composites. Impact damage was produced with energy ranging from 5 J to 20 J on coupon size (89 mm x 55 mm) composite laminates aimed for primary structures in aerospace applications. CT has been employed to characterise in 3D, non-destructively the impact damage generated. An innovative data processing methodology has been developed to obtain a better description of the complex damage structure. This data processing provides the through-thickness damage distribution of the full laminate and allows the individual ply-by-ply damage to be visualised and assessed.]]>
This study presents how X-ray computed tomography (CT) can be employed to obtain a more complete 3-dimensional description of damage in carbon fibre reinforced polymer (CFRP) composites. Impact damage was produced with energy ranging from 5 J to 20 J on coupon size (89 mm x 55 mm) composite laminates aimed for primary structures in aerospace applications. CT has been employed to characterise in 3D, non-destructively the impact damage generated. An innovative data processing methodology has been developed to obtain a better description of the complex damage structure. This data processing provides the through-thickness damage distribution of the full laminate and allows the individual ply-by-ply damage to be visualised and assessed.]]> Mon, 16 Nov 2020 04:08:12 GMT /slideshow/an-innovative-use-of-xray-computed-tomography-in-composite-impact-damage-characterisation/239274277 FabienLeonard@slideshare.net(FabienLeonard) An Innovative Use of X-ray Computed Tomography in Composite Impact Damage Characterisation FabienLeonard This study presents how X-ray computed tomography (CT) can be employed to obtain a more complete 3-dimensional description of damage in carbon fibre reinforced polymer (CFRP) composites. Impact damage was produced with energy ranging from 5 J to 20 J on coupon size (89 mm x 55 mm) composite laminates aimed for primary structures in aerospace applications. CT has been employed to characterise in 3D, non-destructively the impact damage generated. An innovative data processing methodology has been developed to obtain a better description of the complex damage structure. This data processing provides the through-thickness damage distribution of the full laminate and allows the individual ply-by-ply damage to be visualised and assessed. <img style="border:1px solid #C3E6D8;float:right;" alt="" src="https://cdn.slidesharecdn.com/ss_thumbnails/eccm16-201116040812-thumbnail.jpg?width=120&amp;height=120&amp;fit=bounds" /><br> This study presents how X-ray computed tomography (CT) can be employed to obtain a more complete 3-dimensional description of damage in carbon fibre reinforced polymer (CFRP) composites. Impact damage was produced with energy ranging from 5 J to 20 J on coupon size (89 mm x 55 mm) composite laminates aimed for primary structures in aerospace applications. CT has been employed to characterise in 3D, non-destructively the impact damage generated. An innovative data processing methodology has been developed to obtain a better description of the complex damage structure. This data processing provides the through-thickness damage distribution of the full laminate and allows the individual ply-by-ply damage to be visualised and assessed.
An Innovative Use of X-ray Computed Tomography in Composite Impact Damage Characterisation from Fabien L辿onard
]]> 46 0 https://cdn.slidesharecdn.com/ss_thumbnails/eccm16-201116040812-thumbnail.jpg?width=120&height=120&fit=bounds presentation Black http://activitystrea.ms/schema/1.0/post http://activitystrea.ms/schema/1.0/posted 0 Distance transforms and correlation maps for advanced 3D analysis of impact damage in composite panels. /slideshow/distance-transforms-and-correlation-maps-for-advanced-3d-analysis-of-impact-damage-in-composite-panels/239274214 2015-06-29ictms2015-201116035812
Poster from the ICTMS2015 conference.]]>
Poster from the ICTMS2015 conference.]]> Mon, 16 Nov 2020 03:58:12 GMT /slideshow/distance-transforms-and-correlation-maps-for-advanced-3d-analysis-of-impact-damage-in-composite-panels/239274214 FabienLeonard@slideshare.net(FabienLeonard) Distance transforms and correlation maps for advanced 3D analysis of impact damage in composite panels. FabienLeonard Poster from the ICTMS2015 conference. <img style="border:1px solid #C3E6D8;float:right;" alt="" src="https://cdn.slidesharecdn.com/ss_thumbnails/2015-06-29ictms2015-201116035812-thumbnail.jpg?width=120&amp;height=120&amp;fit=bounds" /><br> Poster from the ICTMS2015 conference.
Distance transforms and correlation maps for advanced 3D analysis of impact damage in composite panels. from Fabien L辿onard
]]> 13 0 https://cdn.slidesharecdn.com/ss_thumbnails/2015-06-29ictms2015-201116035812-thumbnail.jpg?width=120&height=120&fit=bounds document Black http://activitystrea.ms/schema/1.0/post http://activitystrea.ms/schema/1.0/posted 0 3D Damage Characterisation in Composite Impacted Panels by Laboratory X-ray Computed Tomography /slideshow/3d-damage-characterisation-in-composite-impacted-panels-by-laboratory-xray-computed-tomography/239274195 ictms2013-201116035435
Presentation from the ICTMS2013 conference.]]>
Presentation from the ICTMS2013 conference.]]> Mon, 16 Nov 2020 03:54:35 GMT /slideshow/3d-damage-characterisation-in-composite-impacted-panels-by-laboratory-xray-computed-tomography/239274195 FabienLeonard@slideshare.net(FabienLeonard) 3D Damage Characterisation in Composite Impacted Panels by Laboratory X-ray Computed Tomography FabienLeonard Presentation from the ICTMS2013 conference. <img style="border:1px solid #C3E6D8;float:right;" alt="" src="https://cdn.slidesharecdn.com/ss_thumbnails/ictms2013-201116035435-thumbnail.jpg?width=120&amp;height=120&amp;fit=bounds" /><br> Presentation from the ICTMS2013 conference.
3D Damage Characterisation in Composite Impacted Panels by Laboratory X-ray Computed Tomography from Fabien L辿onard
]]> 20 0 https://cdn.slidesharecdn.com/ss_thumbnails/ictms2013-201116035435-thumbnail.jpg?width=120&height=120&fit=bounds presentation Black http://activitystrea.ms/schema/1.0/post http://activitystrea.ms/schema/1.0/posted 0 3D Characterisation of Pore Distribution in Resin Film Infused Composites /slideshow/3d-characterisation-of-pore-distribution-in-resin-film-infused-composites/239274168 2012-09-20ict2012composites-201116035113
This paper presents an investigation of voids in carbon fibre reinforced epoxy composites manufactured by resin film infusion using X-ray computed tomography (XCT). Two panels were investigated, one formed with a high viscosity resin, the other with a lower viscosity resin. The study focusses on the characterisation of the 3D distribution of voids in the panels. A new approach to the measurement of defect distribution demonstrated that in both panels, the voids were located close to the binder yarn. When the low viscosity resin was employed, the void distribution was more uniform throughout the panel thickness whereas for the high viscosity resin, the voids were mainly localised in the central part of the panel. Both qualitative and quantitative data were obtained giving extensive, three dimensional information which aids a better understanding of the manufacturing process.]]>
This paper presents an investigation of voids in carbon fibre reinforced epoxy composites manufactured by resin film infusion using X-ray computed tomography (XCT). Two panels were investigated, one formed with a high viscosity resin, the other with a lower viscosity resin. The study focusses on the characterisation of the 3D distribution of voids in the panels. A new approach to the measurement of defect distribution demonstrated that in both panels, the voids were located close to the binder yarn. When the low viscosity resin was employed, the void distribution was more uniform throughout the panel thickness whereas for the high viscosity resin, the voids were mainly localised in the central part of the panel. Both qualitative and quantitative data were obtained giving extensive, three dimensional information which aids a better understanding of the manufacturing process.]]> Mon, 16 Nov 2020 03:51:13 GMT /slideshow/3d-characterisation-of-pore-distribution-in-resin-film-infused-composites/239274168 FabienLeonard@slideshare.net(FabienLeonard) 3D Characterisation of Pore Distribution in Resin Film Infused Composites FabienLeonard This paper presents an investigation of voids in carbon fibre reinforced epoxy composites manufactured by resin film infusion using X-ray computed tomography (XCT). Two panels were investigated, one formed with a high viscosity resin, the other with a lower viscosity resin. The study focusses on the characterisation of the 3D distribution of voids in the panels. A new approach to the measurement of defect distribution demonstrated that in both panels, the voids were located close to the binder yarn. When the low viscosity resin was employed, the void distribution was more uniform throughout the panel thickness whereas for the high viscosity resin, the voids were mainly localised in the central part of the panel. Both qualitative and quantitative data were obtained giving extensive, three dimensional information which aids a better understanding of the manufacturing process. <img style="border:1px solid #C3E6D8;float:right;" alt="" src="https://cdn.slidesharecdn.com/ss_thumbnails/2012-09-20ict2012composites-201116035113-thumbnail.jpg?width=120&amp;height=120&amp;fit=bounds" /><br> This paper presents an investigation of voids in carbon fibre reinforced epoxy composites manufactured by resin film infusion using X-ray computed tomography (XCT). Two panels were investigated, one formed with a high viscosity resin, the other with a lower viscosity resin. The study focusses on the characterisation of the 3D distribution of voids in the panels. A new approach to the measurement of defect distribution demonstrated that in both panels, the voids were located close to the binder yarn. When the low viscosity resin was employed, the void distribution was more uniform throughout the panel thickness whereas for the high viscosity resin, the voids were mainly localised in the central part of the panel. Both qualitative and quantitative data were obtained giving extensive, three dimensional information which aids a better understanding of the manufacturing process.
3D Characterisation of Pore Distribution in Resin Film Infused Composites from Fabien L辿onard
]]> 21 0 https://cdn.slidesharecdn.com/ss_thumbnails/2012-09-20ict2012composites-201116035113-thumbnail.jpg?width=120&height=120&fit=bounds presentation Black http://activitystrea.ms/schema/1.0/post http://activitystrea.ms/schema/1.0/posted 0 XCT to assess defects in titanium ALM parts /slideshow/xct-to-assess-defects-in-titanium-alm-parts/239274138 2012-09-19ict2012alm-201116034737
Additive layer manufacturing (ALM) has the potential to allow engineers almost complete freedom of design, with reduced material wastage and tooling costs, as well as shorter lead times on new designs. Unfortunately, most ALM processes invariably lead to porosity in the material deposited. The ALM process investigated here, selective electron beam melting (SEBM) of a powder bed, is no exception. Although it is known that defects do arise, with this process their dependence on the part geometry and the adopted build strategy has not been resolved. This is of key importance, because experiments have shown porosity can make an order of magnitude difference to the fatigue life of ALM components. X-ray computed tomography (CT) is an ideal tool for fully characterising in 3D the defects seen within ALM parts and has been applied here to study the effect of geometry and build direction on defects in titanium components. The most industrially, realistic worst case scenario was employed using an Arcam machine with a small raster pattern misalignment in order to study all the characteristic flow types possible in the SEBM process. For most of the test samples studied, XCT revealed large elongated pores (> 100 μm) to be present, which grew at a distance of around 1 mm from an edge, following the build direction. The position of this defect type correlated with the misaligned overlap region between the slow contour passes of the electron beam around the periphery of the sample outline and the hatching in fill region of a section. Smaller voids caused by gas entrapment were also resolved by XCT but they appeared to be mostly randomly distributed.]]>
Additive layer manufacturing (ALM) has the potential to allow engineers almost complete freedom of design, with reduced material wastage and tooling costs, as well as shorter lead times on new designs. Unfortunately, most ALM processes invariably lead to porosity in the material deposited. The ALM process investigated here, selective electron beam melting (SEBM) of a powder bed, is no exception. Although it is known that defects do arise, with this process their dependence on the part geometry and the adopted build strategy has not been resolved. This is of key importance, because experiments have shown porosity can make an order of magnitude difference to the fatigue life of ALM components. X-ray computed tomography (CT) is an ideal tool for fully characterising in 3D the defects seen within ALM parts and has been applied here to study the effect of geometry and build direction on defects in titanium components. The most industrially, realistic worst case scenario was employed using an Arcam machine with a small raster pattern misalignment in order to study all the characteristic flow types possible in the SEBM process. For most of the test samples studied, XCT revealed large elongated pores (> 100 μm) to be present, which grew at a distance of around 1 mm from an edge, following the build direction. The position of this defect type correlated with the misaligned overlap region between the slow contour passes of the electron beam around the periphery of the sample outline and the hatching in fill region of a section. Smaller voids caused by gas entrapment were also resolved by XCT but they appeared to be mostly randomly distributed.]]> Mon, 16 Nov 2020 03:47:37 GMT /slideshow/xct-to-assess-defects-in-titanium-alm-parts/239274138 FabienLeonard@slideshare.net(FabienLeonard) XCT to assess defects in titanium ALM parts FabienLeonard Additive layer manufacturing (ALM) has the potential to allow engineers almost complete freedom of design, with reduced material wastage and tooling costs, as well as shorter lead times on new designs. Unfortunately, most ALM processes invariably lead to porosity in the material deposited. The ALM process investigated here, selective electron beam melting (SEBM) of a powder bed, is no exception. Although it is known that defects do arise, with this process their dependence on the part geometry and the adopted build strategy has not been resolved. This is of key importance, because experiments have shown porosity can make an order of magnitude difference to the fatigue life of ALM components. X-ray computed tomography (CT) is an ideal tool for fully characterising in 3D the defects seen within ALM parts and has been applied here to study the effect of geometry and build direction on defects in titanium components. The most industrially, realistic worst case scenario was employed using an Arcam machine with a small raster pattern misalignment in order to study all the characteristic flow types possible in the SEBM process. For most of the test samples studied, XCT revealed large elongated pores (> 100 μm) to be present, which grew at a distance of around 1 mm from an edge, following the build direction. The position of this defect type correlated with the misaligned overlap region between the slow contour passes of the electron beam around the periphery of the sample outline and the hatching in fill region of a section. Smaller voids caused by gas entrapment were also resolved by XCT but they appeared to be mostly randomly distributed. <img style="border:1px solid #C3E6D8;float:right;" alt="" src="https://cdn.slidesharecdn.com/ss_thumbnails/2012-09-19ict2012alm-201116034737-thumbnail.jpg?width=120&amp;height=120&amp;fit=bounds" /><br> Additive layer manufacturing (ALM) has the potential to allow engineers almost complete freedom of design, with reduced material wastage and tooling costs, as well as shorter lead times on new designs. Unfortunately, most ALM processes invariably lead to porosity in the material deposited. The ALM process investigated here, selective electron beam melting (SEBM) of a powder bed, is no exception. Although it is known that defects do arise, with this process their dependence on the part geometry and the adopted build strategy has not been resolved. This is of key importance, because experiments have shown porosity can make an order of magnitude difference to the fatigue life of ALM components. X-ray computed tomography (CT) is an ideal tool for fully characterising in 3D the defects seen within ALM parts and has been applied here to study the effect of geometry and build direction on defects in titanium components. The most industrially, realistic worst case scenario was employed using an Arcam machine with a small raster pattern misalignment in order to study all the characteristic flow types possible in the SEBM process. For most of the test samples studied, XCT revealed large elongated pores (&gt; 100 μm) to be present, which grew at a distance of around 1 mm from an edge, following the build direction. The position of this defect type correlated with the misaligned overlap region between the slow contour passes of the electron beam around the periphery of the sample outline and the hatching in fill region of a section. Smaller voids caused by gas entrapment were also resolved by XCT but they appeared to be mostly randomly distributed.
XCT to assess defects in titanium ALM parts from Fabien L辿onard
]]> 115 0 https://cdn.slidesharecdn.com/ss_thumbnails/2012-09-19ict2012alm-201116034737-thumbnail.jpg?width=120&height=120&fit=bounds presentation Black http://activitystrea.ms/schema/1.0/post http://activitystrea.ms/schema/1.0/posted 0 Impact damage characterisation of fibre metal laminates by X-ray computed tomography /slideshow/impact-damage-characterisation-of-fibre-metal-laminates-by-xray-computed-tomographyfabien-leonard-2014-0226-ict2014/31685332 fabienleonard2014-02-26ict2014-140226144453-phpapp02
Talk given at the 5th Industrial Computed Tomography Conference (ICT2014) in Wels, Austria on the 26th February 2014. This paper presents the first 3D CT assessment of impact damage in coupon size CARALL fibre metal laminates. CT was applied to provide novel 3D insights as to the impact damage produced in both metal and polymer layers of FML. For the metal layers, the presence of yielding/cracking can be assessed, visualised and localised in 3D. For the composite layers, the impact damage can be segmented and rendered in 3D, showing the different damage mechanisms involved (cracking and delamination). The distance transform methodology was employed to obtain through thickness damage profiles. These profiles can be used to automatically separate the segmented impact damage based on damage type.]]>
Talk given at the 5th Industrial Computed Tomography Conference (ICT2014) in Wels, Austria on the 26th February 2014. This paper presents the first 3D CT assessment of impact damage in coupon size CARALL fibre metal laminates. CT was applied to provide novel 3D insights as to the impact damage produced in both metal and polymer layers of FML. For the metal layers, the presence of yielding/cracking can be assessed, visualised and localised in 3D. For the composite layers, the impact damage can be segmented and rendered in 3D, showing the different damage mechanisms involved (cracking and delamination). The distance transform methodology was employed to obtain through thickness damage profiles. These profiles can be used to automatically separate the segmented impact damage based on damage type.]]> Wed, 26 Feb 2014 14:44:53 GMT /slideshow/impact-damage-characterisation-of-fibre-metal-laminates-by-xray-computed-tomographyfabien-leonard-2014-0226-ict2014/31685332 FabienLeonard@slideshare.net(FabienLeonard) Impact damage characterisation of fibre metal laminates by X-ray computed tomography FabienLeonard Talk given at the 5th Industrial Computed Tomography Conference (ICT2014) in Wels, Austria on the 26th February 2014. This paper presents the first 3D CT assessment of impact damage in coupon size CARALL fibre metal laminates. CT was applied to provide novel 3D insights as to the impact damage produced in both metal and polymer layers of FML. For the metal layers, the presence of yielding/cracking can be assessed, visualised and localised in 3D. For the composite layers, the impact damage can be segmented and rendered in 3D, showing the different damage mechanisms involved (cracking and delamination). The distance transform methodology was employed to obtain through thickness damage profiles. These profiles can be used to automatically separate the segmented impact damage based on damage type. <img style="border:1px solid #C3E6D8;float:right;" alt="" src="https://cdn.slidesharecdn.com/ss_thumbnails/fabienleonard2014-02-26ict2014-140226144453-phpapp02-thumbnail.jpg?width=120&amp;height=120&amp;fit=bounds" /><br> Talk given at the 5th Industrial Computed Tomography Conference (ICT2014) in Wels, Austria on the 26th February 2014. This paper presents the first 3D CT assessment of impact damage in coupon size CARALL fibre metal laminates. CT was applied to provide novel 3D insights as to the impact damage produced in both metal and polymer layers of FML. For the metal layers, the presence of yielding/cracking can be assessed, visualised and localised in 3D. For the composite layers, the impact damage can be segmented and rendered in 3D, showing the different damage mechanisms involved (cracking and delamination). The distance transform methodology was employed to obtain through thickness damage profiles. These profiles can be used to automatically separate the segmented impact damage based on damage type.
Impact damage characterisation of fibre metal laminates by X-ray computed tomography from Fabien L辿onard
]]> 2308 1 https://cdn.slidesharecdn.com/ss_thumbnails/fabienleonard2014-02-26ict2014-140226144453-phpapp02-thumbnail.jpg?width=120&height=120&fit=bounds presentation White http://activitystrea.ms/schema/1.0/post http://activitystrea.ms/schema/1.0/posted 0 Fracture behaviour and damage characterisation in composite impact panels by laboratory X-ray computed tomography /slideshow/wilkinson2013/30140653 wilkinson2013-140117131614-phpapp01
Presentation made by Dr Arthur Wilkinson at the Thermosets 2013 conference in Berlin, Germany (September 18-20). This work presents how single edge notch bend (SENB) fracture, Mode-I ILFT and computed tomography (CT) can be employed to characterise the fracture and impact behaviour of composite panels.]]>
Presentation made by Dr Arthur Wilkinson at the Thermosets 2013 conference in Berlin, Germany (September 18-20). This work presents how single edge notch bend (SENB) fracture, Mode-I ILFT and computed tomography (CT) can be employed to characterise the fracture and impact behaviour of composite panels.]]> Fri, 17 Jan 2014 13:16:14 GMT /slideshow/wilkinson2013/30140653 FabienLeonard@slideshare.net(FabienLeonard) Fracture behaviour and damage characterisation in composite impact panels by laboratory X-ray computed tomography FabienLeonard Presentation made by Dr Arthur Wilkinson at the Thermosets 2013 conference in Berlin, Germany (September 18-20). This work presents how single edge notch bend (SENB) fracture, Mode-I ILFT and computed tomography (CT) can be employed to characterise the fracture and impact behaviour of composite panels. <img style="border:1px solid #C3E6D8;float:right;" alt="" src="https://cdn.slidesharecdn.com/ss_thumbnails/wilkinson2013-140117131614-phpapp01-thumbnail.jpg?width=120&amp;height=120&amp;fit=bounds" /><br> Presentation made by Dr Arthur Wilkinson at the Thermosets 2013 conference in Berlin, Germany (September 18-20). This work presents how single edge notch bend (SENB) fracture, Mode-I ILFT and computed tomography (CT) can be employed to characterise the fracture and impact behaviour of composite panels.
Fracture behaviour and damage characterisation in composite impact panels by laboratory X-ray computed tomography from Fabien L辿onard
]]> 917 1 https://cdn.slidesharecdn.com/ss_thumbnails/wilkinson2013-140117131614-phpapp01-thumbnail.jpg?width=120&height=120&fit=bounds presentation Black http://activitystrea.ms/schema/1.0/post http://activitystrea.ms/schema/1.0/posted 0 Introduction /slideshow/2013-0508-uk-xct-focus-group/24497901 2013-05-08ukxctfocusgroup-130722093502-phpapp01
This is the presentation I gave at the UK XCT focus group meeting in May 2013. It covers my research interests and quickly presents the HMXIF.]]>
This is the presentation I gave at the UK XCT focus group meeting in May 2013. It covers my research interests and quickly presents the HMXIF.]]> Mon, 22 Jul 2013 09:35:02 GMT /slideshow/2013-0508-uk-xct-focus-group/24497901 FabienLeonard@slideshare.net(FabienLeonard) Introduction FabienLeonard This is the presentation I gave at the UK XCT focus group meeting in May 2013. It covers my research interests and quickly presents the HMXIF. <img style="border:1px solid #C3E6D8;float:right;" alt="" src="https://cdn.slidesharecdn.com/ss_thumbnails/2013-05-08ukxctfocusgroup-130722093502-phpapp01-thumbnail.jpg?width=120&amp;height=120&amp;fit=bounds" /><br> This is the presentation I gave at the UK XCT focus group meeting in May 2013. It covers my research interests and quickly presents the HMXIF.
Introduction from Fabien L辿onard
]]> 358 1 https://cdn.slidesharecdn.com/ss_thumbnails/2013-05-08ukxctfocusgroup-130722093502-phpapp01-thumbnail.jpg?width=120&height=120&fit=bounds presentation Black http://activitystrea.ms/schema/1.0/post http://activitystrea.ms/schema/1.0/posted 0 3D Characterisation of Void Distribution in Resin Film Infused Composites /slideshow/2012-0920-ict2012-composites/24141936 2012-09-20ict2012composites-130711093649-phpapp02
This paper presents an investigation of voids in carbon fibre reinforced epoxy composites manufactured by resin film infusion using X-ray computed tomography (XCT). Two panels were investigated, one formed with a high viscosity resin, the other with a lower viscosity resin. The study focusses on the characterisation of the 3D distribution of voids in the panels. A new approach to the measurement of defect distribution demonstrated that in both panels, the voids were located close to the binder yarn. When the low viscosity resin was employed, the void distribution was more uniform throughout the panel thickness whereas for the high viscosity resin, the voids were mainly localised in the central part of the panel. Both qualitative and quantitative data were obtained giving extensive, three dimensional information which aids a better understanding of the manufacturing process.]]>
This paper presents an investigation of voids in carbon fibre reinforced epoxy composites manufactured by resin film infusion using X-ray computed tomography (XCT). Two panels were investigated, one formed with a high viscosity resin, the other with a lower viscosity resin. The study focusses on the characterisation of the 3D distribution of voids in the panels. A new approach to the measurement of defect distribution demonstrated that in both panels, the voids were located close to the binder yarn. When the low viscosity resin was employed, the void distribution was more uniform throughout the panel thickness whereas for the high viscosity resin, the voids were mainly localised in the central part of the panel. Both qualitative and quantitative data were obtained giving extensive, three dimensional information which aids a better understanding of the manufacturing process.]]> Thu, 11 Jul 2013 09:36:48 GMT /slideshow/2012-0920-ict2012-composites/24141936 FabienLeonard@slideshare.net(FabienLeonard) 3D Characterisation of Void Distribution in Resin Film Infused Composites FabienLeonard This paper presents an investigation of voids in carbon fibre reinforced epoxy composites manufactured by resin film infusion using X-ray computed tomography (XCT). Two panels were investigated, one formed with a high viscosity resin, the other with a lower viscosity resin. The study focusses on the characterisation of the 3D distribution of voids in the panels. A new approach to the measurement of defect distribution demonstrated that in both panels, the voids were located close to the binder yarn. When the low viscosity resin was employed, the void distribution was more uniform throughout the panel thickness whereas for the high viscosity resin, the voids were mainly localised in the central part of the panel. Both qualitative and quantitative data were obtained giving extensive, three dimensional information which aids a better understanding of the manufacturing process. <img style="border:1px solid #C3E6D8;float:right;" alt="" src="https://cdn.slidesharecdn.com/ss_thumbnails/2012-09-20ict2012composites-130711093649-phpapp02-thumbnail.jpg?width=120&amp;height=120&amp;fit=bounds" /><br> This paper presents an investigation of voids in carbon fibre reinforced epoxy composites manufactured by resin film infusion using X-ray computed tomography (XCT). Two panels were investigated, one formed with a high viscosity resin, the other with a lower viscosity resin. The study focusses on the characterisation of the 3D distribution of voids in the panels. A new approach to the measurement of defect distribution demonstrated that in both panels, the voids were located close to the binder yarn. When the low viscosity resin was employed, the void distribution was more uniform throughout the panel thickness whereas for the high viscosity resin, the voids were mainly localised in the central part of the panel. Both qualitative and quantitative data were obtained giving extensive, three dimensional information which aids a better understanding of the manufacturing process.
3D Characterisation of Void Distribution in Resin Film Infused Composites from Fabien L辿onard
]]> 979 0 https://cdn.slidesharecdn.com/ss_thumbnails/2012-09-20ict2012composites-130711093649-phpapp02-thumbnail.jpg?width=120&height=120&fit=bounds presentation Black http://activitystrea.ms/schema/1.0/post http://activitystrea.ms/schema/1.0/posted 0 Assessment by X-ray CT of the effect of geometry and build direction on defects in titanium ALM parts /slideshow/2012-0919-ict2012-alm/24140928 2012-09-19ict2012alm-130711090909-phpapp02
Additive layer manufacturing (ALM) has the potential to allow engineers almost complete freedom of design, with reduced material wastage and tooling costs, as well as shorter lead times on new designs. Unfortunately, most ALM processes invariably lead to porosity in the material deposited. The ALM process investigated here, selective electron beam melting (SEBM) of a powder bed, is no exception. Although it is known that defects do arise, with this process their dependence on the part geometry and the adopted build strategy has not been resolved. This is of key importance, because experiments have shown porosity can make an order of magnitude difference to the fatigue life of ALM components. X-ray computed tomography (CT) is an ideal tool for fully characterising in 3D the defects seen within ALM parts and has been applied here to study the effect of geometry and build direction on defects in titanium components. The most industrially, realistic worst case scenario was employed using an Arcam machine with a small raster pattern misalignment in order to study all the characteristic flow types possible in the SEBM process. For most of the test samples studied, XCT revealed large elongated pores (> 100 μm) to be present, which grew at a distance of around 1 mm from an edge, following the build direction. The position of this defect type correlated with the misaligned overlap region between the slow contour passes of the electron beam around the periphery of the sample outline and the hatching in fill region of a section. Smaller voids caused by gas entrapment were also resolved by XCT but they appeared to be mostly randomly distributed.]]>
Additive layer manufacturing (ALM) has the potential to allow engineers almost complete freedom of design, with reduced material wastage and tooling costs, as well as shorter lead times on new designs. Unfortunately, most ALM processes invariably lead to porosity in the material deposited. The ALM process investigated here, selective electron beam melting (SEBM) of a powder bed, is no exception. Although it is known that defects do arise, with this process their dependence on the part geometry and the adopted build strategy has not been resolved. This is of key importance, because experiments have shown porosity can make an order of magnitude difference to the fatigue life of ALM components. X-ray computed tomography (CT) is an ideal tool for fully characterising in 3D the defects seen within ALM parts and has been applied here to study the effect of geometry and build direction on defects in titanium components. The most industrially, realistic worst case scenario was employed using an Arcam machine with a small raster pattern misalignment in order to study all the characteristic flow types possible in the SEBM process. For most of the test samples studied, XCT revealed large elongated pores (> 100 μm) to be present, which grew at a distance of around 1 mm from an edge, following the build direction. The position of this defect type correlated with the misaligned overlap region between the slow contour passes of the electron beam around the periphery of the sample outline and the hatching in fill region of a section. Smaller voids caused by gas entrapment were also resolved by XCT but they appeared to be mostly randomly distributed.]]> Thu, 11 Jul 2013 09:09:09 GMT /slideshow/2012-0919-ict2012-alm/24140928 FabienLeonard@slideshare.net(FabienLeonard) Assessment by X-ray CT of the effect of geometry and build direction on defects in titanium ALM parts FabienLeonard Additive layer manufacturing (ALM) has the potential to allow engineers almost complete freedom of design, with reduced material wastage and tooling costs, as well as shorter lead times on new designs. Unfortunately, most ALM processes invariably lead to porosity in the material deposited. The ALM process investigated here, selective electron beam melting (SEBM) of a powder bed, is no exception. Although it is known that defects do arise, with this process their dependence on the part geometry and the adopted build strategy has not been resolved. This is of key importance, because experiments have shown porosity can make an order of magnitude difference to the fatigue life of ALM components. X-ray computed tomography (CT) is an ideal tool for fully characterising in 3D the defects seen within ALM parts and has been applied here to study the effect of geometry and build direction on defects in titanium components. The most industrially, realistic worst case scenario was employed using an Arcam machine with a small raster pattern misalignment in order to study all the characteristic flow types possible in the SEBM process. For most of the test samples studied, XCT revealed large elongated pores (> 100 μm) to be present, which grew at a distance of around 1 mm from an edge, following the build direction. The position of this defect type correlated with the misaligned overlap region between the slow contour passes of the electron beam around the periphery of the sample outline and the hatching in fill region of a section. Smaller voids caused by gas entrapment were also resolved by XCT but they appeared to be mostly randomly distributed. <img style="border:1px solid #C3E6D8;float:right;" alt="" src="https://cdn.slidesharecdn.com/ss_thumbnails/2012-09-19ict2012alm-130711090909-phpapp02-thumbnail.jpg?width=120&amp;height=120&amp;fit=bounds" /><br> Additive layer manufacturing (ALM) has the potential to allow engineers almost complete freedom of design, with reduced material wastage and tooling costs, as well as shorter lead times on new designs. Unfortunately, most ALM processes invariably lead to porosity in the material deposited. The ALM process investigated here, selective electron beam melting (SEBM) of a powder bed, is no exception. Although it is known that defects do arise, with this process their dependence on the part geometry and the adopted build strategy has not been resolved. This is of key importance, because experiments have shown porosity can make an order of magnitude difference to the fatigue life of ALM components. X-ray computed tomography (CT) is an ideal tool for fully characterising in 3D the defects seen within ALM parts and has been applied here to study the effect of geometry and build direction on defects in titanium components. The most industrially, realistic worst case scenario was employed using an Arcam machine with a small raster pattern misalignment in order to study all the characteristic flow types possible in the SEBM process. For most of the test samples studied, XCT revealed large elongated pores (&gt; 100 μm) to be present, which grew at a distance of around 1 mm from an edge, following the build direction. The position of this defect type correlated with the misaligned overlap region between the slow contour passes of the electron beam around the periphery of the sample outline and the hatching in fill region of a section. Smaller voids caused by gas entrapment were also resolved by XCT but they appeared to be mostly randomly distributed.
Assessment by X-ray CT of the effect of geometry and build direction on defects in titanium ALM parts from Fabien L辿onard
]]> 520 7 https://cdn.slidesharecdn.com/ss_thumbnails/2012-09-19ict2012alm-130711090909-phpapp02-thumbnail.jpg?width=120&height=120&fit=bounds presentation White http://activitystrea.ms/schema/1.0/post http://activitystrea.ms/schema/1.0/posted 0 Laboratory X-ray CT Applied to the Characterisation of Tubular Composite Specimen /slideshow/laboratory-xray-ct-applied-to-the-characterisation-of-tubular-composite-specimen/22390330 2013-07-01ictms2013-130603112646-phpapp01
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]]> Mon, 03 Jun 2013 11:26:46 GMT /slideshow/laboratory-xray-ct-applied-to-the-characterisation-of-tubular-composite-specimen/22390330 FabienLeonard@slideshare.net(FabienLeonard) Laboratory X-ray CT Applied to the Characterisation of Tubular Composite Specimen FabienLeonard <img style="border:1px solid #C3E6D8;float:right;" alt="" src="https://cdn.slidesharecdn.com/ss_thumbnails/2013-07-01ictms2013-130603112646-phpapp01-thumbnail.jpg?width=120&amp;height=120&amp;fit=bounds" /><br>
Laboratory X-ray CT Applied to the Characterisation of Tubular Composite Specimen from Fabien L辿onard
]]> 297 0 https://cdn.slidesharecdn.com/ss_thumbnails/2013-07-01ictms2013-130603112646-phpapp01-thumbnail.jpg?width=120&height=120&fit=bounds document Black http://activitystrea.ms/schema/1.0/post http://activitystrea.ms/schema/1.0/posted 0 X-ray Computed Tomography: A New Dimension in Materials Science /slideshow/2011-0413-yplc-final/16782007 2011-04-13yplcfinal-130226094606-phpapp01
This presentation was delivered at the IOM3 Young Persons Lecture Competition National Final held at The Armourers and Brasiers Hall in London on April 13 2011. I was the North West region entrant and won second place overall. The abstract of the presentation is shown below: X-ray Computed Tomography: A New Dimension in Materials Science Almost every area of materials has been revolutionised by the ability to obtain two-dimensional images with an increasing level of details. However, materials science being a three-dimensional science, techniques such as tomography -the art of reconstructing a sliceable virtual three-dimensional replica of the object from two-dimensional images- have become extremely popular. X-ray Computed Tomography or XCT has been around for forty years but it is only in the last decade that the technique has seen dramatic changes through the combination of improved detector technologies for data acquisition and massively increased computing power for data analysis. These changes have allowed imaging to be extended from two spatial dimensions to three dimensions, the realm of X-ray computed tomography. This lecture will present in details X-ray computed tomography: the background of the technique will be first introduced. Then, experiments performed within the Henry Moseley X-ray Imaging Facility will be presented to demonstrate the unique capabilities of XCT for each type of materials: metals, ceramics and polymers. Finally the latest developments will be introduced. ]]>
This presentation was delivered at the IOM3 Young Persons Lecture Competition National Final held at The Armourers and Brasiers Hall in London on April 13 2011. I was the North West region entrant and won second place overall. The abstract of the presentation is shown below: X-ray Computed Tomography: A New Dimension in Materials Science Almost every area of materials has been revolutionised by the ability to obtain two-dimensional images with an increasing level of details. However, materials science being a three-dimensional science, techniques such as tomography -the art of reconstructing a sliceable virtual three-dimensional replica of the object from two-dimensional images- have become extremely popular. X-ray Computed Tomography or XCT has been around for forty years but it is only in the last decade that the technique has seen dramatic changes through the combination of improved detector technologies for data acquisition and massively increased computing power for data analysis. These changes have allowed imaging to be extended from two spatial dimensions to three dimensions, the realm of X-ray computed tomography. This lecture will present in details X-ray computed tomography: the background of the technique will be first introduced. Then, experiments performed within the Henry Moseley X-ray Imaging Facility will be presented to demonstrate the unique capabilities of XCT for each type of materials: metals, ceramics and polymers. Finally the latest developments will be introduced. ]]> Tue, 26 Feb 2013 09:46:06 GMT /slideshow/2011-0413-yplc-final/16782007 FabienLeonard@slideshare.net(FabienLeonard) X-ray Computed Tomography: A New Dimension in Materials Science FabienLeonard This presentation was delivered at the IOM3 Young Persons Lecture Competition National Final held at The Armourers and Brasiers Hall in London on April 13 2011. I was the North West region entrant and won second place overall. The abstract of the presentation is shown below: X-ray Computed Tomography: A New Dimension in Materials Science Almost every area of materials has been revolutionised by the ability to obtain two-dimensional images with an increasing level of details. However, materials science being a three-dimensional science, techniques such as tomography -the art of reconstructing a sliceable virtual three-dimensional replica of the object from two-dimensional images- have become extremely popular. X-ray Computed Tomography or XCT has been around for forty years but it is only in the last decade that the technique has seen dramatic changes through the combination of improved detector technologies for data acquisition and massively increased computing power for data analysis. These changes have allowed imaging to be extended from two spatial dimensions to three dimensions, the realm of X-ray computed tomography. This lecture will present in details X-ray computed tomography: the background of the technique will be first introduced. Then, experiments performed within the Henry Moseley X-ray Imaging Facility will be presented to demonstrate the unique capabilities of XCT for each type of materials: metals, ceramics and polymers. Finally the latest developments will be introduced. <img style="border:1px solid #C3E6D8;float:right;" alt="" src="https://cdn.slidesharecdn.com/ss_thumbnails/2011-04-13yplcfinal-130226094606-phpapp01-thumbnail.jpg?width=120&amp;height=120&amp;fit=bounds" /><br> This presentation was delivered at the IOM3 Young Persons Lecture Competition National Final held at The Armourers and Brasiers Hall in London on April 13 2011. I was the North West region entrant and won second place overall. The abstract of the presentation is shown below: X-ray Computed Tomography: A New Dimension in Materials Science Almost every area of materials has been revolutionised by the ability to obtain two-dimensional images with an increasing level of details. However, materials science being a three-dimensional science, techniques such as tomography -the art of reconstructing a sliceable virtual three-dimensional replica of the object from two-dimensional images- have become extremely popular. X-ray Computed Tomography or XCT has been around for forty years but it is only in the last decade that the technique has seen dramatic changes through the combination of improved detector technologies for data acquisition and massively increased computing power for data analysis. These changes have allowed imaging to be extended from two spatial dimensions to three dimensions, the realm of X-ray computed tomography. This lecture will present in details X-ray computed tomography: the background of the technique will be first introduced. Then, experiments performed within the Henry Moseley X-ray Imaging Facility will be presented to demonstrate the unique capabilities of XCT for each type of materials: metals, ceramics and polymers. Finally the latest developments will be introduced.
X-ray Computed Tomography: A New Dimension in Materials Science from Fabien L辿onard
]]> 4454 0 https://cdn.slidesharecdn.com/ss_thumbnails/2011-04-13yplcfinal-130226094606-phpapp01-thumbnail.jpg?width=120&height=120&fit=bounds presentation White http://activitystrea.ms/schema/1.0/post http://activitystrea.ms/schema/1.0/posted 0 https://cdn.slidesharecdn.com/profile-photo-FabienLeonard-48x48.jpg?cb=1630419582 I am the lead in the development of data analysis and visualisation methods for 3D X-ray and neutron imaging data sets for the University of Manchester at Harwell. I am responsible for the transfer, management, and analysis of X-ray and neutron imaging data, including the extraction and statistical analyses of the results, and the automation of data processing workflows. I am also responsible for training doctoral and post-doctoral students in data analysis as well as managing my own group of data analysts. scholar.google.com/citations?hl=en&user=3dBDrHAAAAAJ https://cdn.slidesharecdn.com/ss_thumbnails/eccm16-201116040812-thumbnail.jpg?width=320&height=320&fit=bounds slideshow/an-innovative-use-of-xray-computed-tomography-in-composite-impact-damage-characterisation/239274277 An Innovative Use of X... https://cdn.slidesharecdn.com/ss_thumbnails/2015-06-29ictms2015-201116035812-thumbnail.jpg?width=320&height=320&fit=bounds slideshow/distance-transforms-and-correlation-maps-for-advanced-3d-analysis-of-impact-damage-in-composite-panels/239274214 Distance transforms an... https://cdn.slidesharecdn.com/ss_thumbnails/ictms2013-201116035435-thumbnail.jpg?width=320&height=320&fit=bounds slideshow/3d-damage-characterisation-in-composite-impacted-panels-by-laboratory-xray-computed-tomography/239274195 3D Damage Characterisa...