Development of computational wear simulation of metal-on-metal hip resurfacing replacements

Tribocorrosion of passive metals in the mixed lubrication regime: theoretical model and application to metal-on-metal artificial hip joints

“…Above approximately 1000 N the total wear varies nearly linearly with load. This trend is in agreement with experimental observations from simulators [10,11]. Fig.…”

“…These formalisms are in agreement with Archard's theorem implying a proportionality between wear and the real area of contact established at plastically deforming asperity junctions and the sliding distance. The real area of contact is given by the ratio of normal load to indentation hardness, Predictions from such models were found to correlate well with experimental data obtained from hip joint simulators for both the running-in (the initial operation period characterized by relatively high wear rates) and the steady state (subsequent low wear rate period) wear regimes [10,11]. However, the limited number of operational parameters considered in Archard's formalism does not allow to explain the effect of other factors such as the clearance that play a crucial role on wear of MoM pairings [12].…”

“…Early wear formalisms were based on the empirical assumption that wear is linearly proportional to the normal load and sliding distance [2,10,11]. These formalisms are in agreement with Archard's theorem implying a proportionality between wear and the real area of contact established at plastically deforming asperity junctions and the sliding distance.…”

“…Liu et al [10] and Uddin et al [11] used such an equation to predict wear rate and wear distribution of MoM artificial hip joints. The former study identified two wear coefficients k m of a resurfacing CoCr alloy hip joint: 1.13 Â 10 À 8 mm 3 /(N Á m) for short-term, up to one million gait cycles and 1.2 Â 10 À 9 mm 3 /(N Á m) for long-term, up to 50 million gait cycles, respectively.…”

Effect of microseparation on contact mechanics in metal‐on‐metal hip replacements—A finite element analysis

“…The materials were assumed to be elastic‐perfectly plastic with the yield strength of 840 MPa38 for the CoCr head and cup bearings, and linearly elastic for the cement, with the Young's moduli of 230 and 3.3 GPa and Poisson's ratios of 0.3 and 0.35,39 for the metal bearing and cement, respectively. The head‐cup rim contact was modeled with the finite sliding algorithm using ABAQUS/Implicit40(Version 6.11‐1; Dassault Systemes Simulia Corporation, Providence, RI).…”