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Three Point Bend Deflector

      Patrick Schomacker
         Biomechanics
          Spring 2012
Deflector and Solidworks Image
Spring Constant for less stiff spring




Mass of Soda and can: 0.37 kg         Force: 3.626 N
Initial Length: 44 mm                 Final Length: 85 mm
Delta x=41 mm                         k=F/delta x=0.08844 N/mm
                             k=88.44 N/m
Spring Constant for stiff spring




Mass of Soda and Can: 0.37 kg              Force=3.626 N
Initial Length=44 mm                       Final Length=55 mm
Delta x=11 mm                              k=F/delta x=0.32964 N/mm
                            k=329.64 N/m
Force Deflection Images


          Point 0-No Load




Point 1                     Point 2




Point 3                     Point 4
Spring-Eraser Deflection Data
(Used less stiff spring: k=88.44 N/m,
       initial length=44 mm)

   Points   Deflection of eraser (mm)   Change in Length of spring (mm)   Force of spring (N)



     0                 0                              0                           0



     1                 2                              14                         1.24



     2                 3                              17                         1.5



     3                 4                              18                         1.59



     4                 4                              19                         1.68
Force vs Deflection Curve
                             Force vs Deflection
            1.8

            1.6

            1.4

            1.2

             1
Force (N)




            0.8

            0.6

            0.4

            0.2

             0
                  0      2                3           4   4
                                    Deflection (mm)
Innovation
     ? Because the screw did
       not fit in the
       polycarbonate tube, a
       rubber piece was glued
       and taped to
       screw, allowing the tube
       to fit over it.
     ? Also used eraser instead
       of toothpick to show
       more deflection

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Three point bend deflector slide presentation

  • 1. Three Point Bend Deflector Patrick Schomacker Biomechanics Spring 2012
  • 3. Spring Constant for less stiff spring Mass of Soda and can: 0.37 kg Force: 3.626 N Initial Length: 44 mm Final Length: 85 mm Delta x=41 mm k=F/delta x=0.08844 N/mm k=88.44 N/m
  • 4. Spring Constant for stiff spring Mass of Soda and Can: 0.37 kg Force=3.626 N Initial Length=44 mm Final Length=55 mm Delta x=11 mm k=F/delta x=0.32964 N/mm k=329.64 N/m
  • 5. Force Deflection Images Point 0-No Load Point 1 Point 2 Point 3 Point 4
  • 6. Spring-Eraser Deflection Data (Used less stiff spring: k=88.44 N/m, initial length=44 mm) Points Deflection of eraser (mm) Change in Length of spring (mm) Force of spring (N) 0 0 0 0 1 2 14 1.24 2 3 17 1.5 3 4 18 1.59 4 4 19 1.68
  • 7. Force vs Deflection Curve Force vs Deflection 1.8 1.6 1.4 1.2 1 Force (N) 0.8 0.6 0.4 0.2 0 0 2 3 4 4 Deflection (mm)
  • 8. Innovation ? Because the screw did not fit in the polycarbonate tube, a rubber piece was glued and taped to screw, allowing the tube to fit over it. ? Also used eraser instead of toothpick to show more deflection