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Full-Text Articles in Engineering
Failure Analysis Of Retrieved Uhmwpe Tibial Insert In Total Knee Replacement
Failure Analysis Of Retrieved Uhmwpe Tibial Insert In Total Knee Replacement
A.S. Md Abdul Haseeb
This study involves the failure analysis of an ultra high molecular polyethylene (UHMWPE) tibial insert from Apollo® Total Knee System, which was removed after 10. years of service from 70. years old female patient. The tibial insert was investigated by using a stereoscope, scanning electron microscope (SEM), infinite focus microscope (IFM) and energy disperse spectroscopy (EDS) to characterize the morphology and composition of the bearing surface. Differential scanning calorimetry (DSC) and Fourier transform spectroscopy (FTIR) were employed to characterize the degradation and crystallinity of the component. Gel-permeation chromatography (GPC) was used to measure the polyethylene tibial insert molecular weight. Results …
A Comparative Wear Study On Heat-Treated Aluminium-Lithium Alloy And Pure Aluminium
A Comparative Wear Study On Heat-Treated Aluminium-Lithium Alloy And Pure Aluminium
A.S. Md Abdul Haseeb
Wear behaviour of solution-treated and aged aluminium-lithium alloy (2.5% Li, 2% Cu, 1% Mg and 0.15% Zr) was compared with that of pure aluminium. Wear tests were carried out in ambient air in a pin-on-disc type apparatus under dry sliding conditions using hardened steel disc as the counterbody. A normal load of 10 N and a linear speed of 0.98 m s-1 were used during the tests. Microscopic investigation, microhardness measurement on the subsurface of wear scars on pins, X-ray diffraction study and morphological examination of wear debris were done to elucidate wear mechanism. It has been found that the …