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Title:
Machining of Biomedical Implants
PI: I.S. Jawahir
Co-PI: O. W. Dillon and D. Puleo
Graduate Student: A. Deshpande
Abstract
Metal-on-metal hip joints are being increasingly used as an alternative to metal-on-polyethylene hip joints. In order to control and minimize the wear in metal-on-metal hip joints, which is the major cause of failure of hip joints, it is essential to the study the mechanism and causes of debris generation. The microstructure of the alloy used in the hip joint has been shown to have a strong influence on the wear process, with the wear process resulting in a reduction of grain size below the surface of the implant. It is a well known fact that the fatigue life of a component is related to the residual stresses induce in the component during the manufacturing process. The project aims to understand the relationship between debris generation in the hip implant and residual stresses. The microstructure of the implant would be modified using machining techniques to impart compressive residual stresses in the component to minimize the debris generation. The ultimate aim is to demonstrate that advanced machining methodologies can be used to manufacture implants having complex shape without compromising the physical, mechanical, and chemical properties of the devices so as to provide rapid and mass manufacture while removing some of the intermediate process required for surface modification..
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