Field variable associations with scratch orientation dependence of UHMWPE wear: a finite element analysis.
Field variable associations with scratch orientation dependence of UHMWPE wear: a finite element analysis.
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DOI：
10.1115/1.2939273
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发表时间：
2008-12
期刊：
影响因子：
--
通讯作者：
Brown TD
中科院分区：
文献类型：
--
作者：
Paul MC;Glennon LP;Baer TE;Brown TD
已发现金属对聚乙烯全关节置换的金属关节面上的垫片明显加速聚乙烯的磨损/粘着磨损，并构成临床队列中观察到的磨损率相当大的变异性的来源。相对于相对表面滑动的局部方向的划痕方向可能是影响接合过程中瞬时碎屑释放的一个因素。开发了一个三维局部有限元模型，用于研究具有划痕金属配合面的特定方向聚乙烯关节，以探索在相应的物理实验中可能与划痕磨损的方向依赖性相关的连续水平应力/应变参数。对于所有划痕方向，计算的最大应力值均超过超高分子量聚乙烯（UHMWPE）的屈服强度，但在划痕方向之间没有明显变化。两个连续水平参数判断最一致的整体方向依赖性的实验磨损：（1）在加载方向上的累积压缩总法向应变，和（2）最大瞬时压缩总法向应变横向滑动方向。这样的应力/应变度量可能是有用的，在全球计算模型的磨损加速度，作为替代品，以纳入局部金属表面粗糙化的各向异性。
Scratches on the metal bearing surface of metal-on-polyethylene total joint replacements have been found to appreciably accelerate abrasive/adhesive wear of polyethylene, and constitute a source of the considerable variability of wear rate seen within clinical cohorts. Scratch orientation with respect to the local direction of relative surface sliding is presumably a factor affecting instantaneous debris liberation during articulation. A three-dimensional local finite element model was developed of orientation-specific polyethylene articulation with a scratched metal counterface, to explore continuum-level stress/strain parameters potentially correlating with the orientation dependence of scratch wear in a corresponding physical experiment. Computed maximum stress values exceeded the yield strength of ultra-high molecular weight polyethylene (UHMWPE) for all scratch orientations, but did not vary appreciably among scratch orientations. Two continuum-level parameters judged most consistent overall with the direction dependence of experimental wear were: (1) cumulative compressive total normal strain in the direction of loading, and (2) maximum instantaneous compressive total normal strain transverse to the sliding direction. Such stress/strain metrics could be useful in global computational models of wear acceleration, as surrogates to incorporate anisotropy of local metal surface roughening.
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影响因子：
5
作者：
ATKINSON, JR;DOWSON, D;WROBLEWSKI, BM
通讯作者：
WROBLEWSKI, BM
影响因子：
3.5
作者：
Goldsmith, AAJ;Dowson, D;Lane, JM
通讯作者：
Lane, JM
影响因子：
5
作者：
COOPER, JR;DOWSON, D;FISHER, J
通讯作者：
FISHER, J
DOI：
10.1097/01.blo.0000150450.42829.b8
发表时间：
2005-01-01
影响因子：
4.2
作者：
Lundberg, HJ;Stewart, KJ;Brown, TA
通讯作者：
Brown, TA
影响因子：
3.5
作者：
Bragdon, CR;O'Connor, DO;Harris, WH
通讯作者：
Harris, WH