A simple surrogate test method to rank the wear performance of prospective ceramic materials under hip prosthesis edge-loading conditions.
A simple surrogate test method to rank the wear performance of prospective ceramic materials under hip prosthesis edge-loading conditions.
复制标题
DOI：
10.1002/jbm.b.33009
复制
发表时间：
2014-02
期刊：
影响因子：
--
通讯作者：
A. Sanders;R. Brannon
中科院分区：
文献类型：
--
作者：
A. Sanders;R. Brannon
本研究开发了一种新的测试方法，用于评估陶瓷材料在模拟人工髋关节轴承边缘载荷的严重接触应力下的耐磨性。简单形状的测试样本-圆柱体和球体-被设计为边缘加载的股骨头/内衬植入物对的替代品。根据赫兹接触理论，简单样本的理论接触尺寸和压力与股骨头/内衬对的理论接触尺寸和压力相同，因此确保了简单样本的等效性。代用品由三种陶瓷材料制成：Al 2 O3、氧化锆增韧氧化铝（ZTA）和ZrO 2。它们以三种不同的材料配对，并在200 N法向接触力下往复运动1000-2000次循环，这产生了小的（<1 mm（2））磨损疤痕。这三种材料对通过它们的耐磨性进行排名，通过使用干涉仪测量的磨损材料的体积进行量化。对相同材料对的边缘加载髋关节植入物进行了类似测试。替代品复制了其全尺寸植入物对应物的磨损等级，并模拟了其摩擦力趋势。结果表明，使用简单的测试样本的代理测试可以有效地排名严重，边缘加载接触应力下的陶瓷材料的磨损性能，同时复制边缘加载磨损的开始阶段。因此，这种简单的磨损测试可能有助于在开发早期筛选和排名新的、有前景的材料，以产生更复杂的全尺寸髋关节模拟器磨损测试的优化候选材料。
This research has developed a novel test method for evaluating the wear resistance of ceramic materials under severe contact stresses simulating edge loading in prosthetic hip bearings. Simply shaped test specimens - a cylinder and a spheroid - were designed as surrogates for an edge-loaded, head/liner implant pair. Equivalency of the simpler specimens was assured in the sense that their theoretical contact dimensions and pressures were identical, according to Hertzian contact theory, to those of the head/liner pair. The surrogates were fabricated in three ceramic materials: Al2 O3 , zirconia-toughened alumina (ZTA), and ZrO2 . They were mated in three different material pairs and reciprocated under a 200 N normal contact force for 1000-2000 cycles, which created small (<1 mm(2) ) wear scars. The three material pairs were ranked by their wear resistance, quantified by the volume of abraded material measured using an interferometer. Similar tests were performed on edge-loaded hip implants in the same material pairs. The surrogates replicated the wear rankings of their full-scale implant counterparts and mimicked their friction force trends. The results show that a proxy test using simple test specimens can validly rank the wear performance of ceramic materials under severe, edge-loading contact stresses, while replicating the beginning stage of edge-loading wear. This simple wear test is therefore potentially useful for screening and ranking new, prospective materials early in their development, to produce optimized candidates for more complicated full-scale hip simulator wear tests.