ºÝºÝߣshows by User: DavePalmerPE / http://www.slideshare.net/images/logo.gif ºÝºÝߣshows by User: DavePalmerPE / Sat, 09 Apr 2016 19:15:12 GMT ºÝºÝߣShare feed for ºÝºÝߣshows by User: DavePalmerPE Molding-2015-Palmer /slideshow/molding2015palmer/60700590 d94c37c2-38d2-4c91-8d67-ba751473ef5d-160409191513
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]]> Sat, 09 Apr 2016 19:15:12 GMT /slideshow/molding2015palmer/60700590 DavePalmerPE@slideshare.net(DavePalmerPE) Molding-2015-Palmer DavePalmerPE <img style="border:1px solid #C3E6D8;float:right;" alt="" src="https://cdn.slidesharecdn.com/ss_thumbnails/d94c37c2-38d2-4c91-8d67-ba751473ef5d-160409191513-thumbnail.jpg?width=120&amp;height=120&amp;fit=bounds" /><br>
Molding-2015-Palmer from Dave Palmer, P.E.
]]> 233 6 https://cdn.slidesharecdn.com/ss_thumbnails/d94c37c2-38d2-4c91-8d67-ba751473ef5d-160409191513-thumbnail.jpg?width=120&height=120&fit=bounds presentation 000000 http://activitystrea.ms/schema/1.0/post http://activitystrea.ms/schema/1.0/posted 0 SAE 2015 World Congress: Chat With The Experts /slideshow/15-chat-0008/47120423 15chat-0008-150417112335-conversion-gate01
Everything has to be made out of something. What is the best material for a given application? How can designers know what material properties to use in a simulation? How does processing influence a material’s performance? How can failure analysis provide insights for better designs? Materials expertise can inform decision-making at all stages of the product development cycle. How can materials engineers best support the needs of their organizations? How can organizations get the best value from their materials engineers? This discussion will focus on how materials engineering can provide a key supporting role in design and analysis, simulation, testing, production, and process optimization.]]>
Everything has to be made out of something. What is the best material for a given application? How can designers know what material properties to use in a simulation? How does processing influence a material’s performance? How can failure analysis provide insights for better designs? Materials expertise can inform decision-making at all stages of the product development cycle. How can materials engineers best support the needs of their organizations? How can organizations get the best value from their materials engineers? This discussion will focus on how materials engineering can provide a key supporting role in design and analysis, simulation, testing, production, and process optimization.]]> Fri, 17 Apr 2015 11:23:35 GMT /slideshow/15-chat-0008/47120423 DavePalmerPE@slideshare.net(DavePalmerPE) SAE 2015 World Congress: Chat With The Experts DavePalmerPE Everything has to be made out of something. What is the best material for a given application? How can designers know what material properties to use in a simulation? How does processing influence a material’s performance? How can failure analysis provide insights for better designs? Materials expertise can inform decision-making at all stages of the product development cycle. How can materials engineers best support the needs of their organizations? How can organizations get the best value from their materials engineers? This discussion will focus on how materials engineering can provide a key supporting role in design and analysis, simulation, testing, production, and process optimization. <img style="border:1px solid #C3E6D8;float:right;" alt="" src="https://cdn.slidesharecdn.com/ss_thumbnails/15chat-0008-150417112335-conversion-gate01-thumbnail.jpg?width=120&amp;height=120&amp;fit=bounds" /><br> Everything has to be made out of something. What is the best material for a given application? How can designers know what material properties to use in a simulation? How does processing influence a material’s performance? How can failure analysis provide insights for better designs? Materials expertise can inform decision-making at all stages of the product development cycle. How can materials engineers best support the needs of their organizations? How can organizations get the best value from their materials engineers? This discussion will focus on how materials engineering can provide a key supporting role in design and analysis, simulation, testing, production, and process optimization.
SAE 2015 World Congress: Chat With The Experts from Dave Palmer, P.E.
]]> 946 2 https://cdn.slidesharecdn.com/ss_thumbnails/15chat-0008-150417112335-conversion-gate01-thumbnail.jpg?width=120&height=120&fit=bounds presentation 000000 http://activitystrea.ms/schema/1.0/post http://activitystrea.ms/schema/1.0/posted 0 Effect of Surface Hardening Technique and Case Depth on Rolling Contact Fatigue Behavior of Alloy Steels /slideshow/effect-of-surface-hardening-technique-and-case-depth-on-rolling-contact-fatigue-behavior-of-alloy-steels/34877264 stle2014051914-140519184709-phpapp02
Surface hardening techniques are widely used to improve the rolling contact fatigue resistance of materials. This study investigated the rolling contact fatigue (RCF) resistance of hardened, ground steel rods made from three different aircraft-quality alloy steels (AISI 8620, 9310 and 4140), and hardened using different techniques (atmosphere carburizing, vacuum carburizing, and induction hardening) at different case depths. The fatigue life of the rods was determined using a three ball-on-rod rolling contact fatigue test machine. After testing, the surfaces of the rods were examined using scanning electron microscopy (SEM), and their microstructures were examined using metallographic techniques. In addition, the surface topography of the rods was measured using white-light interferometry. Relationships between surface hardness, case depth, and fatigue life were investigated. The longest lives were observed for the vacuum carburized AISI 9310 specimens, while the shortest lives were observed for the induction hardened AISI 4140 specimens. It was found the depth to a hardness of 613 HV (56 HRC), as opposed to the traditional definition of case depth as the depth to a hardness of 513 HV (50 HRC), provided a somewhat better correlation to RCF life, and the hardness at a depth of 0.254 mm provided a somewhat better correlation than the surface hardness to RCF life.]]>
Surface hardening techniques are widely used to improve the rolling contact fatigue resistance of materials. This study investigated the rolling contact fatigue (RCF) resistance of hardened, ground steel rods made from three different aircraft-quality alloy steels (AISI 8620, 9310 and 4140), and hardened using different techniques (atmosphere carburizing, vacuum carburizing, and induction hardening) at different case depths. The fatigue life of the rods was determined using a three ball-on-rod rolling contact fatigue test machine. After testing, the surfaces of the rods were examined using scanning electron microscopy (SEM), and their microstructures were examined using metallographic techniques. In addition, the surface topography of the rods was measured using white-light interferometry. Relationships between surface hardness, case depth, and fatigue life were investigated. The longest lives were observed for the vacuum carburized AISI 9310 specimens, while the shortest lives were observed for the induction hardened AISI 4140 specimens. It was found the depth to a hardness of 613 HV (56 HRC), as opposed to the traditional definition of case depth as the depth to a hardness of 513 HV (50 HRC), provided a somewhat better correlation to RCF life, and the hardness at a depth of 0.254 mm provided a somewhat better correlation than the surface hardness to RCF life.]]> Mon, 19 May 2014 18:47:09 GMT /slideshow/effect-of-surface-hardening-technique-and-case-depth-on-rolling-contact-fatigue-behavior-of-alloy-steels/34877264 DavePalmerPE@slideshare.net(DavePalmerPE) Effect of Surface Hardening Technique and Case Depth on Rolling Contact Fatigue Behavior of Alloy Steels DavePalmerPE Surface hardening techniques are widely used to improve the rolling contact fatigue resistance of materials. This study investigated the rolling contact fatigue (RCF) resistance of hardened, ground steel rods made from three different aircraft-quality alloy steels (AISI 8620, 9310 and 4140), and hardened using different techniques (atmosphere carburizing, vacuum carburizing, and induction hardening) at different case depths. The fatigue life of the rods was determined using a three ball-on-rod rolling contact fatigue test machine. After testing, the surfaces of the rods were examined using scanning electron microscopy (SEM), and their microstructures were examined using metallographic techniques. In addition, the surface topography of the rods was measured using white-light interferometry. Relationships between surface hardness, case depth, and fatigue life were investigated. The longest lives were observed for the vacuum carburized AISI 9310 specimens, while the shortest lives were observed for the induction hardened AISI 4140 specimens. It was found the depth to a hardness of 613 HV (56 HRC), as opposed to the traditional definition of case depth as the depth to a hardness of 513 HV (50 HRC), provided a somewhat better correlation to RCF life, and the hardness at a depth of 0.254 mm provided a somewhat better correlation than the surface hardness to RCF life. <img style="border:1px solid #C3E6D8;float:right;" alt="" src="https://cdn.slidesharecdn.com/ss_thumbnails/stle2014051914-140519184709-phpapp02-thumbnail.jpg?width=120&amp;height=120&amp;fit=bounds" /><br> Surface hardening techniques are widely used to improve the rolling contact fatigue resistance of materials. This study investigated the rolling contact fatigue (RCF) resistance of hardened, ground steel rods made from three different aircraft-quality alloy steels (AISI 8620, 9310 and 4140), and hardened using different techniques (atmosphere carburizing, vacuum carburizing, and induction hardening) at different case depths. The fatigue life of the rods was determined using a three ball-on-rod rolling contact fatigue test machine. After testing, the surfaces of the rods were examined using scanning electron microscopy (SEM), and their microstructures were examined using metallographic techniques. In addition, the surface topography of the rods was measured using white-light interferometry. Relationships between surface hardness, case depth, and fatigue life were investigated. The longest lives were observed for the vacuum carburized AISI 9310 specimens, while the shortest lives were observed for the induction hardened AISI 4140 specimens. It was found the depth to a hardness of 613 HV (56 HRC), as opposed to the traditional definition of case depth as the depth to a hardness of 513 HV (50 HRC), provided a somewhat better correlation to RCF life, and the hardness at a depth of 0.254 mm provided a somewhat better correlation than the surface hardness to RCF life.
Effect of Surface Hardening Technique and Case Depth on Rolling Contact Fatigue Behavior of Alloy Steels from Dave Palmer, P.E.
]]> 5456 13 https://cdn.slidesharecdn.com/ss_thumbnails/stle2014051914-140519184709-phpapp02-thumbnail.jpg?width=120&height=120&fit=bounds presentation 000000 http://activitystrea.ms/schema/1.0/post http://activitystrea.ms/schema/1.0/posted 0 Stress Ratio Effects in Fatigue of Lost Foam Aluminum Alloy 356 /slideshow/stress-ratio-effects-in-fatigue-of-lost-foam-aluminum-alloy-356/33946860 thesispresentation-140425110344-phpapp01
Lost foam casting is a highly versatile metalcasting process that offers significant benefits in terms of design flexibility, energy consumption, and environmental impact. In the present work, the fatigue behavior of lost foam cast aluminum alloy 356, in conditions T6 and T7, was investigated, under both zero and non-zero mean stress conditions, with either as-cast or machined surface finish. Scanning electron microscopy was used to identify and measure the defect from which fatigue fracture initiated. Based on the results, the applicability of nine different fatigue mean stress equations was compared. The widely-used Goodman equation was found to be highly non-conservative, while the Stulen, Topper-Sandor, and Walker equations performed reasonably well. Each of these three equations includes a material-dependent term for stress ratio sensitivity. The stress ratio sensitivity was found to be affected by heat treatment, with the T6 condition having greater sensitivity than the T7 condition. The surface condition (as-cast vs. machined) did not significantly affect the stress ratio sensitivity. The fatigue life of as-cast specimens was found to be approximately 60 – 70% lower than that of machined specimens at the same equivalent stress. This reduction could not be attributed to defect size alone, and may be due to the greater frequency of oxide films near the as-cast surface. Directions for future work, including improved testing methods and some possible methods of improving the properties of lost foam castings, are discussed.]]>
Lost foam casting is a highly versatile metalcasting process that offers significant benefits in terms of design flexibility, energy consumption, and environmental impact. In the present work, the fatigue behavior of lost foam cast aluminum alloy 356, in conditions T6 and T7, was investigated, under both zero and non-zero mean stress conditions, with either as-cast or machined surface finish. Scanning electron microscopy was used to identify and measure the defect from which fatigue fracture initiated. Based on the results, the applicability of nine different fatigue mean stress equations was compared. The widely-used Goodman equation was found to be highly non-conservative, while the Stulen, Topper-Sandor, and Walker equations performed reasonably well. Each of these three equations includes a material-dependent term for stress ratio sensitivity. The stress ratio sensitivity was found to be affected by heat treatment, with the T6 condition having greater sensitivity than the T7 condition. The surface condition (as-cast vs. machined) did not significantly affect the stress ratio sensitivity. The fatigue life of as-cast specimens was found to be approximately 60 – 70% lower than that of machined specimens at the same equivalent stress. This reduction could not be attributed to defect size alone, and may be due to the greater frequency of oxide films near the as-cast surface. Directions for future work, including improved testing methods and some possible methods of improving the properties of lost foam castings, are discussed.]]> Fri, 25 Apr 2014 11:03:44 GMT /slideshow/stress-ratio-effects-in-fatigue-of-lost-foam-aluminum-alloy-356/33946860 DavePalmerPE@slideshare.net(DavePalmerPE) Stress Ratio Effects in Fatigue of Lost Foam Aluminum Alloy 356 DavePalmerPE Lost foam casting is a highly versatile metalcasting process that offers significant benefits in terms of design flexibility, energy consumption, and environmental impact. In the present work, the fatigue behavior of lost foam cast aluminum alloy 356, in conditions T6 and T7, was investigated, under both zero and non-zero mean stress conditions, with either as-cast or machined surface finish. Scanning electron microscopy was used to identify and measure the defect from which fatigue fracture initiated. Based on the results, the applicability of nine different fatigue mean stress equations was compared. The widely-used Goodman equation was found to be highly non-conservative, while the Stulen, Topper-Sandor, and Walker equations performed reasonably well. Each of these three equations includes a material-dependent term for stress ratio sensitivity. The stress ratio sensitivity was found to be affected by heat treatment, with the T6 condition having greater sensitivity than the T7 condition. The surface condition (as-cast vs. machined) did not significantly affect the stress ratio sensitivity. The fatigue life of as-cast specimens was found to be approximately 60 – 70% lower than that of machined specimens at the same equivalent stress. This reduction could not be attributed to defect size alone, and may be due to the greater frequency of oxide films near the as-cast surface. Directions for future work, including improved testing methods and some possible methods of improving the properties of lost foam castings, are discussed. <img style="border:1px solid #C3E6D8;float:right;" alt="" src="https://cdn.slidesharecdn.com/ss_thumbnails/thesispresentation-140425110344-phpapp01-thumbnail.jpg?width=120&amp;height=120&amp;fit=bounds" /><br> Lost foam casting is a highly versatile metalcasting process that offers significant benefits in terms of design flexibility, energy consumption, and environmental impact. In the present work, the fatigue behavior of lost foam cast aluminum alloy 356, in conditions T6 and T7, was investigated, under both zero and non-zero mean stress conditions, with either as-cast or machined surface finish. Scanning electron microscopy was used to identify and measure the defect from which fatigue fracture initiated. Based on the results, the applicability of nine different fatigue mean stress equations was compared. The widely-used Goodman equation was found to be highly non-conservative, while the Stulen, Topper-Sandor, and Walker equations performed reasonably well. Each of these three equations includes a material-dependent term for stress ratio sensitivity. The stress ratio sensitivity was found to be affected by heat treatment, with the T6 condition having greater sensitivity than the T7 condition. The surface condition (as-cast vs. machined) did not significantly affect the stress ratio sensitivity. The fatigue life of as-cast specimens was found to be approximately 60 – 70% lower than that of machined specimens at the same equivalent stress. This reduction could not be attributed to defect size alone, and may be due to the greater frequency of oxide films near the as-cast surface. Directions for future work, including improved testing methods and some possible methods of improving the properties of lost foam castings, are discussed.
Stress Ratio Effects in Fatigue of Lost Foam Aluminum Alloy 356 from Dave Palmer, P.E.
]]> 4887 14 https://cdn.slidesharecdn.com/ss_thumbnails/thesispresentation-140425110344-phpapp01-thumbnail.jpg?width=120&height=120&fit=bounds presentation 000000 http://activitystrea.ms/schema/1.0/post http://activitystrea.ms/schema/1.0/posted 0 Effect of Painting on the Mechanical Properties of Injection-Molded Plastics /slideshow/antec-presentation/33852621 antecpresentation-140423095139-phpapp02
Paint can have significant effects on the mechanical properties of plastic substrates. The selection of a paint system that is not properly matched to a given plastic substrate can lead to premature failure. While anecdotal accounts are plentiful, quantitative data regarding effects of coating on plastics is relatively scarce. This paper describes the effect of a high-solids acrylic topcoat paint, with either of two different adhesion promoters or no adhesion promoter, on the mechanical properties of four different plastic substrates: general-purpose acrylonitrile-butadiene-styrene (ABS), high-impact ABS, weather-resistant acrylonitrile-styrene-acrylate (ASA), and mineral-filled polyethylene ionomer/polyamide-6 blend.]]>
Paint can have significant effects on the mechanical properties of plastic substrates. The selection of a paint system that is not properly matched to a given plastic substrate can lead to premature failure. While anecdotal accounts are plentiful, quantitative data regarding effects of coating on plastics is relatively scarce. This paper describes the effect of a high-solids acrylic topcoat paint, with either of two different adhesion promoters or no adhesion promoter, on the mechanical properties of four different plastic substrates: general-purpose acrylonitrile-butadiene-styrene (ABS), high-impact ABS, weather-resistant acrylonitrile-styrene-acrylate (ASA), and mineral-filled polyethylene ionomer/polyamide-6 blend.]]> Wed, 23 Apr 2014 09:51:39 GMT /slideshow/antec-presentation/33852621 DavePalmerPE@slideshare.net(DavePalmerPE) Effect of Painting on the Mechanical Properties of Injection-Molded Plastics DavePalmerPE Paint can have significant effects on the mechanical properties of plastic substrates. The selection of a paint system that is not properly matched to a given plastic substrate can lead to premature failure. While anecdotal accounts are plentiful, quantitative data regarding effects of coating on plastics is relatively scarce. This paper describes the effect of a high-solids acrylic topcoat paint, with either of two different adhesion promoters or no adhesion promoter, on the mechanical properties of four different plastic substrates: general-purpose acrylonitrile-butadiene-styrene (ABS), high-impact ABS, weather-resistant acrylonitrile-styrene-acrylate (ASA), and mineral-filled polyethylene ionomer/polyamide-6 blend. <img style="border:1px solid #C3E6D8;float:right;" alt="" src="https://cdn.slidesharecdn.com/ss_thumbnails/antecpresentation-140423095139-phpapp02-thumbnail.jpg?width=120&amp;height=120&amp;fit=bounds" /><br> Paint can have significant effects on the mechanical properties of plastic substrates. The selection of a paint system that is not properly matched to a given plastic substrate can lead to premature failure. While anecdotal accounts are plentiful, quantitative data regarding effects of coating on plastics is relatively scarce. This paper describes the effect of a high-solids acrylic topcoat paint, with either of two different adhesion promoters or no adhesion promoter, on the mechanical properties of four different plastic substrates: general-purpose acrylonitrile-butadiene-styrene (ABS), high-impact ABS, weather-resistant acrylonitrile-styrene-acrylate (ASA), and mineral-filled polyethylene ionomer/polyamide-6 blend.
Effect of Painting on the Mechanical Properties of Injection-Molded Plastics from Dave Palmer, P.E.
]]> 1400 7 https://cdn.slidesharecdn.com/ss_thumbnails/antecpresentation-140423095139-phpapp02-thumbnail.jpg?width=120&height=120&fit=bounds presentation 000000 http://activitystrea.ms/schema/1.0/post http://activitystrea.ms/schema/1.0/posted 0 https://cdn.slidesharecdn.com/profile-photo-DavePalmerPE-48x48.jpg?cb=1649965115 As the resident expert in metals, plastics, rubber, coatings, corrosion, and failure analysis, I support new product development, lead problem-solving teams, and conduct research both internally and with academic partners. I developed and patented anti-corrosion technologies that allow BRP to offer an industry-leading five-year corrosion warranty on Evinrude E-TEC G2 outboard engines. https://cdn.slidesharecdn.com/ss_thumbnails/d94c37c2-38d2-4c91-8d67-ba751473ef5d-160409191513-thumbnail.jpg?width=320&height=320&fit=bounds slideshow/molding2015palmer/60700590 Molding-2015-Palmer https://cdn.slidesharecdn.com/ss_thumbnails/15chat-0008-150417112335-conversion-gate01-thumbnail.jpg?width=320&height=320&fit=bounds slideshow/15-chat-0008/47120423 SAE 2015 World Congres... https://cdn.slidesharecdn.com/ss_thumbnails/stle2014051914-140519184709-phpapp02-thumbnail.jpg?width=320&height=320&fit=bounds slideshow/effect-of-surface-hardening-technique-and-case-depth-on-rolling-contact-fatigue-behavior-of-alloy-steels/34877264 Effect of Surface Hard...