Numerical analysis of stress and displacement on the index finger of the prosthetic hand due to hook position

Abstract

Upper limb disabilities become a serious concern in Indonesia. There are many prosthetic hand products from other countries, yet they rarely fit to Indonesian citizen, neither for the price nor the size. Due to this reason, Diponegoro University developed a prosthetic hand to solve the problem currently faced by the Indonesian citizen. It is expected that the produced prosthetic hand will be useful and suitable for Indonesian people, in terms of price and size. The design safety becomes the main concern in the development of prosthetic hand, and this paper investigated the reliability of the index finger of the prosthetic hand under the hook load. The results found out that the upper part experienced maximum stress at the value 17.993 MPa while the lower part experienced maximum stress at the value 29.472 MPa. The maximum stress that occurs on the index finger of the prosthetic hand is still under the yield stress of material. With the safety factor about 3.9 and 2.37 for upper part and lower part, respectively, it can be declared that the developed prosthetic hand is safe to perform hook position.