Metals & Alloys, University of Bayreuth, Germany.
J Mech Behav Biomed Mater. 2010 May;3(4):331-8. doi: 10.1016/j.jmbbm.2010.01.004. Epub 2010 Jan 25.
The deformation behavior of ultrahigh molecular polyethylene (UHMWPE) is studied in the temperature range of 23-80 degrees C. Samples are examined in quasi-static compression, tensile and creep tests to determine the accelerated deformation of UHMWPE at elevated temperatures. The deformation mechanisms under compression load can be described by one strain rate and temperature dependent Eyring process. The activation energy and volume of that process do not change between 23 degrees C and 50 degrees C. This suggests that the deformation mechanism under compression remains stable within this temperature range. Tribological tests are conducted to transfer this activated energy approach to the deformation behavior under loading typical for artificial knee joints. While this approach does not cover the wear mechanisms close to the surface, testing at higher temperatures is shown to have a significant potential to reduce the testing time for lifetime predictions in terms of the macroscopic creep and deformation behavior of artificial joints.
研究了超高分子量聚乙烯（UHMWPE）在 23-80°C 温度范围内的变形行为。通过准静态压缩、拉伸和蠕变试验对样品进行了检查，以确定 UHMWPE 在高温下的加速变形。在压缩载荷下的变形机制可以用一个应变率和温度相关的 Eyring 过程来描述。该过程的激活能和体积在 23°C 和 50°C 之间没有变化。这表明在这个温度范围内，压缩下的变形机制保持稳定。摩擦学试验用于将这种激活能方法转移到加载典型人工膝关节的变形行为。虽然这种方法不能涵盖接近表面的磨损机制，但在较高温度下进行测试显示出在人工关节的宏观蠕变和变形行为的寿命预测方面具有显著的缩短测试时间的潜力。
