Thesis

The ISO 10328:2006 static testing and finite element analysis of the ICRC prosthetic knee for use in low income countries

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Awarding institution
  • University of Strathclyde
Date of award
  • 2014
Thesis identifier
  • T13923
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Abstract
  • The prosthetic knees currently available in developing countries have inadequacies concerning durability and mobility. People living in non-industrialised countries represent 80% of disabled population in the world, and the majority has no access to basic health services. The aim of this project was to test one of those knees in order to verify if it conforms to the ISO Standard 10328:2006 for prosthetics. An assembly was made by means of the International Committee of the Red Cross (ICRC) prosthetic knee and seven of the original polypropylene components. Additional mechanical components such as two metal plates were manufactured. Static tests were based on the ISO 10328:2006 structural testing of lower-limb prostheses protocol. All static tests were carried out using an Instron ElectroPuls™ E10000 machine. The stress-strain characteristics of the assembly were determined from each test. Because of the presence of a crack in the knee component and the separation of the weld between the conical cup and the convex disc while performing the ultimate strength test, the machine was manually stopped before the load had reached the desired loading value. Even so, the test was passed as the lower load limit P3 was achieved. The assembly was then investigated through a finite element analysis computer programme, COSMOSWorks. The model was created with the same dimensions of the assembly and a static linear analysis was performed. Subsequently, the results were displayed through contour plots. The data output was analysed to determine the maximum Von Mises stresses and overall stress and strain distributions. The displacement present was examined, paying particular attention to the deformation across the polypropylene components, as these proved to be the parts most vulnerable during testing. The ISO Test Standard 10328, was used as the basis for testing. The results show that despite a displacement up to 28.77mm and the application of a 2390N load, there are few areas where Von Mises stress are higher than the material yield strength, therefore suggesting that no structural failure of the assembly is expected during testing.
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DOI
Date Created
  • 2014
Former identifier
  • 1042726

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