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- W1708594519 abstract "Contact mechanics, wear and tribology of hip implant devices have been studied since earlyimplantations and the performance of the devices are becoming increasingly important. Wearand surface damage of these bearing surfaces occur through normal gait loading conditions.However, in addition to this, stripe wear patterns are observed on patient implant retrievalsand following hip simulator studies. Novel computational and theoretical methods were usedand developed based on advanced computer aided engineering techniques and the finiteelement method. Hip joint modelling and numerical methodologies of mechanical wearsimulations were studied through a newly proposed scripting method. Shakedown theory andmaps were referred to for studying the biotribology and contact mechanics of hip resurfacingdevices under cyclic normal, severe and edge loading conditions. Through implicit andexplicit finite element modelling lateral displacement and laxity based microseparationmodels were developed. The contact pressure under edge loading conditions was at least afactor of 2 larger than under normal loading conditions. The wear rates of both the femoralhead and acetabular cup during the bedding-in period were between 1-3 mm3/mc (millioncycles) and 80-110 mm3/mc based on a steady-state wear coefficient. Results showed thatmodelling and verifying the contact and stress results under edge loading conditions requiredmore careful computational modelling than for normal loading conditions. The high contactpressures observed during simulations of microseparation models were consistent with thehigh level of wear and surface damage observed in experimental simulator studies and frompatient retrievals. These methods can therefore be used as a technique to simulate wear ofhip implant devices. Shakedown assessments showed that under normal, as well as edgeloading and severe loading conditions the hip device remained below the elastic shakedownregion of a rolling and sliding shakedown map, which is ideal for minimal surface contact andsubsurface damage." @default.
- W1708594519 created "2016-06-24" @default.
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- W1708594519 date "2013-05-01" @default.
- W1708594519 modified "2023-09-28" @default.
- W1708594519 title "Computational and theoretical contact modelling of hip implant devices with the application of wear simulations" @default.
- W1708594519 hasPublicationYear "2013" @default.
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