Improvement design and testing of a prosthetic leg

Mahid @ Ibrahim, Mohd Fakhrul Hafizuddin Ilman (2022) Improvement design and testing of a prosthetic leg. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

Prosthetic leg is a model of design that mimics the function of natural leg which can help people with leg amputation to get around more easily. There are various type of prosthetic leg that has been designed in this cosmopolitan era. However, most of the design is very expensive because of the material used, the design type and the adding of technology that been added to the design such as tracker, programable robot motor for feet movement and others. This project is focusing on improvement design and testing of a prosthetic leg that comfortable to use as it has affordable price and suitable for people with this disabilities. This design of prosthetic leg was designed by selection sketching of design idea. The first method of selecting this sketching idea was distributing questionnaire to public. Based on the questionnaire, some criterias were made and been proceeded to House of Quality (HOQ) and design selection matrix. Based on the HOQ and design selection matrix, the highest score of design was chosen to the Computer Aided Design (CAD) modelling and analysis of design. For CAD modelling, CATIA software was chosen because it can design complex shape and have advantages on designing prosthetic leg as it have workbench of Generative Shape Design and Mechanical Part Design. For Finite Element Analysis (FEA), Altair SIMSOLID software was chosen. The advantage of using this software is it can analysis assembly 3D model and very easy to use. The 3D printer used for printing this prosthetic leg model is Farsoon SS402P Selective Laser Sintering (SLS) 3D printer with material polymer based powder Nylon FS3200PA. Forces applied on the 3D model are the parameter for the result of analysis. The applied force loads were 100kg (980.665N), 80kg (784.532N), and 60kg (588.399N). The analysis will present results for displacement, factor of safety and Von Mises Stress. Based on the result of analysis, the maximum displacement was result by the model with 980.665 N force with the value of 1.1775 x 10-2m, the maximum stress was result by the model with 980.665 N force with the value of 1.4013 x 102 MPa and the factor of safety of this model still in range of 1.0-3.0 which is safe to use by prosthetic leg user and has been fabricated wtih the characteristic of lightweight, aesthetic design, have an airflow to prevent limb from sweating high durable can withstand the weight of user.

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