Compliance calibration for fatigue crack propagation testing of ultra high molecular weight polyethylene.
Compliance calibration for fatigue crack propagation testing of ultra high molecular weight polyethylene.
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DOI：
10.1016/j.biomaterials.2006.05.003
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发表时间：
2006-09
期刊：
影响因子：
14
通讯作者：
R. Varadarajan;C. Rimnac
中科院分区：
文献类型：
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作者：
R. Varadarajan;C. Rimnac
超高分子量聚乙烯（UHMWPE）全关节置换部件在某些条件下存在疲劳断裂风险。因此，UHMWPE的抗疲劳裂纹起始/扩展性值得关注。在UHMWPE的疲劳裂纹扩展试验期间，通常目视观察裂纹扩展;但是，这种方法可能很耗时，并且要求在试验期间可接近样本。本研究旨在证明UHMWPE疲劳裂纹扩展试验的顺应性方法的适用性。我们假设为金属开发的标准校准系数可能不适用于UHMWPE，并且不同的UHMWPE材料将需要不同的顺应性校准系数。三种UHMWPE材料：灭菌（30 kGy）;在环境条件下检查高度交联和退火（100 kGy，130°C）;以及高度交联和再熔化（100 kGy，150°C）。结果支持在UHMWPE疲劳裂纹扩展试验过程中确定裂纹长度的顺应性方法的适用性。根据假设，发现UHMWPE的标准校准系数不准确。确定了准确预测裂纹扩展行为的新的PPE特定校准系数。此外，正如假设的那样，三种材料的顺应性校准系数显著不同。这是首次报告的研究，证明了顺应性方法测量UHMWPE裂纹长度的适用性。
Ultra High Molecular Weight Polyethylene (UHMWPE) total joint replacement components under certain conditions are at risk of fatigue fracture. Thus, the fatigue crack inception/propagation resistance of UHMWPE is of interest. During fatigue crack propagation tests of UHMWPE, crack growth is often followed visually; however, this approach can be time consuming and requires that the specimen be accessible during testing. The objective of this study was to demonstrate the applicability of the compliance method for fatigue crack propagation tests of UHMWPE. We hypothesized that the standard calibration coefficients developed for metals may not be appropriate for UHMWPE and that different UHMWPE materials would require different compliance calibration coefficients. Three UHMWPE materials: sterilized (30kGy); highly crosslinked and annealed (100kGy, 130°C); and highly crosslinked and remelted (100kGy, 150°C) were examined under ambient conditions. The results support the applicability of the compliance method for determination of crack length during fatigue crack propagation testing of UHMWPE. As hypothesized, the standard calibration coefficients were found to be inaccurate for UHMWPE. New UHMWPE-specific calibration coefficients were determined which predicted the crack growth behavior accurately. Also, as hypothesized, the compliance calibration coefficients for the three materials were significantly different. This is the first reported study to demonstrate the applicability of a compliance method to measure crack length in UHMWPE.