Modelagem e análise de tensão para prótese de mão

Abstract

The present work has as its objective the analysis of tensions and identification of the maximum load that the hand prosthesis would support, without deformations occurring. The simulated materials are ABS and PLA, both widely used commercially in existing prostheses on the market, due to their set of physical properties, making a piece with light mass, but able to withstand loads. The type of prosthesis was defined as passive where it does not perform and is in the hooked position, and the measurements used for modeling were taken by the author himself with the help of anthropometry. The modeling and simulations were performed with the help of Autodesk Inventor, performing a mesh refinement with 320,419 nodes and 205,201 elements, with a mesh size of 0.1mm. The simulations were performed by varying the value of the applied load, seeking the yield limit of the material because it could be concluded that that result would be the maximum load supported by the prosthesis. It was obtained that the ABS prosthesis can support a tensile force equivalent to 196N, generating a tension of 14.67 MPa, for PLA the material supported a force of 320N with 24.8 MPa, being the total mass of the prosthesis around 380 grams. These results were obtained without considering a safety factor, if we consider a safety factor equal to 2, we have that our prosthesis would support 98 N for ABS and 160 N for PLA, values very close to those in the market that support from 100 to 160 N with a mass of 400 grams.