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Design Project

Design Project. Marisa Bernal Neysa Alicea Ang é lica B á ez Beatriz Ramos. What would you do…. if you loose any of your limbs?. Outline. Design Purpose Applications Engineering Considerations Uniqueness Challenges Areas of Opportunities New Techniques. Prosthetic Leg. LINER.

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Design Project

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  1. Design Project Marisa Bernal Neysa Alicea Angélica Báez Beatriz Ramos

  2. What would you do… if you loose any of your limbs?

  3. Outline • Design • Purpose • Applications • Engineering Considerations • Uniqueness • Challenges • Areas of Opportunities • New Techniques

  4. Prosthetic Leg LINER FEET SOCKET KNEE

  5. Socket

  6. Purpose • Improve the design of the prosthesis socket, making it more comfortable for the user, and thus improving the quality of life of people with disabilities.

  7. Applications • For medical purposes, related to athletes with disabilities.

  8. Engineering Considerations • Use impact analysis in our calculations • Use the safest approximations for our design • Proper material selection

  9. Material Characteristics Lightweight  low density Stiff  high Elastic Modulus Minimize Maximize

  10. Material Characteristics

  11. Material Characteristics • Material Possibilities • Wood • Technical Ceramics • Composites • Carbon Fiber Reinforced Plastics (CFRP) • Carbon Fiber Reinforced Plastic (CFRP) • Density: 1.8 g/cc • Modulus of Elasticity: 225 GPa • Sut: 3800 Mpa

  12. Uniqueness • A prosthesis has to be designed to fit the needs of a specific person. • It is customized for each user

  13. Challenge • Consider that the product is a medical device • Convert our project to shapes that we can analyze with the concept learned in class

  14. Material Selection

  15. Static Loads Analysis

  16. Static Load Analysis • For this analysis we used the following equations and obtained the shown values. 2.68 x 10-6m= 2.6 x 10-3mm

  17. Dynamic Load Analysis

  18. Dynamic Load Analysis • Impact Load • Maximum Elongation • M=mass • v=velocity at impact • L=length • E=Elastic Modulus • A=area

  19. Dynamic Load Analysis • Impact Load • Maximum stress • E = Elastic Modulus • δmax = maximum elongation • L = length

  20. Dynamic Load Analysis • We calculated the values of: • =3195.38KN = • = 128.69MPa = • Using stress concentrator factor Kf = 1.5 • = 192.95MPa • = 192.95MPa • We calculated the fatigue strength: • = 0.4 SUT • =1520MPa

  21. Dynamic Load Analysis • Stress concentration factors:

  22. Dynamic Load Analysis • Using Modified Goodman theory to calculate the safety factor:

  23. Sm Sm Sf 1.3 x 107 5 x 108 Component life • Aproximated it to the behavior of aluminum • a=19922.54, b= -0.2815 • N = 1.3 x 107 cycles

  24. Areas of Opportunity • Assumed values were used since data for our material was not available • Design uniqueness. • A different analysis is needed for each person

  25. New Knowledge • Reinforce teamwork skills • Loads distribution in prosthetic devices • Impact loads

  26. Thanks for your attention!!! Any Questions???

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