A clamped cantilever beam test was developed to determine the fatigue crack propagation rate of the CoCr alloy/PMMA cement interface at high crack tip phase angles. A combination of finite element and experimental methods was used to determine the fatigue crack growth rates of two different CoCr alloy/PMMA cement surfaces. A crack tip phase angle of 69 deg was found, indicating that loading at the crack tip was mixed-mode with a large degree of in-plane shear loading. The energy required to propagate a crack at the interface was much greater for the plasma-sprayed CoCr surface when compared to the PMMA-precoated satin finish p<0.001. Both interface surfaces could be modeled using a Paris fatigue crack growth law over crack propagation rates of 10−4 to 10−9 m/cycle.[S0148-0731(00)01306-6]

Issue Section:
Technical Papers
Keywords:
prosthetics, biomedical materials, biomechanics, fatigue, fatigue cracks, cobalt alloys, chromium alloys, finite element analysis, plasma arc sprayed coatings, polymers
Topics:
Alloys, Cantilever beams, Cements (Adhesives), Fatigue, Fatigue cracks, Fracture (Materials), Plasmas (Ionized gases), Cycles, Finite element analysis
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