The effects of degradation on the properties, stresses, and strains in ultra-high molecular weight polyethylene components for total hip and knee replacement
Cornell University, January, 1995 - 374 pages
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12 mm thick ABAQUS acetabular Analytical Functions analytical model articulating surface average density behavior of UHMWPE bilinear model Chapter chemical and mechanical coefficient of determination composite beam conforming knee design contact stresses correlations cross section cyclic stress level degradation rate degraded UHMWPE density and cyclic density distribution density profile effective stresses effective von Mises elastic modulus element set experimental Figure finite element models furnace annealing gamma radiation irradiation large strains large-strain material model linear load Material Model Parameters maximum principal stresses mechanical degradation mechanical properties Mises stress molecular weight polyethylene nonconforming Poisson's ratio polyethylene polymer post-irradiation aging predicted properties of UHMWPE Quadrilinear Material Model quadrilinear model region residual error retrieved components shear stress shelf aging slope stresses and strains surface damage Table test specimens tibial component design total joint replacement true strain true stress true stress-strain behavior true stress-strain curve UHMWPE components vitro degradation experiment yield stress