Marisa Bernal Neysa Alicea Angélica Báez Beatriz Ramos

if you loose any of your limbs?

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

Prosthetic Leg LINER FEET SOCKET KNEE

Socket

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.

Applications For medical purposes, related to athletes with disabilities.

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

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

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

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

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

Material Selection

Static Loads Analysis

Static Load Analysis For this analysis we used the following equations and obtained the shown values x m= 2.6 x mm

Dynamic Load Analysis

Impact Load Maximum Elongation M=mass v=velocity at impact L=length E=Elastic Modulus A=area

Dynamic Load Analysis Impact Load Maximum stress E = Elastic Modulus δ max = maximum elongation L = length

Dynamic Load Analysis We calculated the values of: = KN = = MPa = Using stress concentrator factor Kf = 1.5 = MPa We calculated the fatigue strength: = 0.4 SUT =1520MPa

Dynamic Load Analysis Stress concentration factors:

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

Component life Aproximated it to the behavior of aluminum a= , b= N = 1.3 x 107 cycles S m SfSf 5 x x 10 7 SmSm

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

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

Any Questions???