Fatigue Analysis of Syme’s Prosthesis

Abstract

In this work, the fatigue strength of the Syme’s prosthetic socket is investigated numerically and theoretically with the aim of knowing the resistance of the proposed material of the Syme’s socket to the repeated loads that occurring during locomotion of amputee. One proposed laminate for manufacturing the Syme’s prosthetic socket used 4-layers of woven carbon fibre cloth ,6-layers perlon fibre and acrylic resin. The layup was (2-P + 1-C + 1- P + 2-C + 1- P+ 1-C + 2-P). The geometric shape of the socket was built using 3D scan for obtaining the real shape of the socket. It was noted theoretically and numerically that the maximum principal stresses lay at the bottom fillet of the cutout in the lateral side. Also, it was found that the proposed material has the ability to resist the repeated stresses. The results of fatigue analysis showed that the minimum value of the fatigue safety factor was equal to 4.637. It can be concluded that fatigue strength is inversely proportional to the stresses that applied on the socket, whereas the stresses significantly depend on the applied force, radius of circular section, cutout angle and thickness for the prosthetic socket in the theoretical part.
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