The Effects of Degradation on the Properties, Stresses, and Strains in Ultra-high Molecular Weight Polyethylene Components for Total Hip and Knee ReplacementCornell University, 1995 - 374 pages |
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12 mm thick ABAQUS acetabular Analytical Functions analytical model articulating surface average density bilinear model Chapter coefficient of determination composite beam conforming knee design contact stresses correlations cyclic stress level degradation rate degraded UHMWPE density and cyclic density distribution Density g/cc density profile design in flexion effective stresses 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 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 slopes E1 stresses and strains surface damage Table tensile test specimens tibial component design total joint replacement transition point T1 True Strain True Stress MPa true stress-strain curve UHMWPE components vitro degradation experiment von Mises stress yield stress Δσ