Athayde J N, Siqueira C J M, Kuromoto N K, Cambraia H N
Department of Mechanical Engineering-DEMEC, Federal University of Paraná, Polytechnic Center-Technology Sector, P.O. Box 19019, 81531-990 Curitiba, Brazil.
Department of Physics, Federal University of Paraná, Polytechnic Center-Technology Sector, P.O. Box 19019, 81531-990 Curitiba, Brazil.
Rev Sci Instrum. 2017 Jul;88(7):075004. doi: 10.1063/1.4993733.
Orthopedic implants still have limitations regarding their durability, despite being in use for over fifty years. Particles arising from wear due to the relative motion of their surfaces remain responsible for aseptic failure. This paper presents a device to be coupled with a reciprocal linear tribometer to reproduce the ex vivo wear of biomaterials, allowing the measurement of force and coefficient of friction. The device consists of a structure connected to the tribometer that transforms its reciprocal linear motion into one that is oscillatory for the mechanical assembly that contains the samples to test the desired biomaterials. The tribological pair used for testing consisted of Ultra High Molecular Weight Polyethylene (UHMWPE) in conjunction with the austenitic stainless steel AISI 316L in dry lubrication. The results showed that the values of the coefficient of friction in the linear mode and oscillatory mode and the UHMWPE life curve in the oscillatory mode were consistent with those cited in the literature for tests in a dry lubrication environment. Moreover, the UHMWPE sample life curve showed a reduction in the wear rate that can be explained by the preponderance of a wear mechanism over the others. The volumetric wear showed an increase with the number of cycles.
尽管骨科植入物已经使用了五十多年，但在耐用性方面仍存在局限性。由于其表面的相对运动而产生的磨损颗粒仍然是无菌性失效的原因。本文介绍了一种与往复式线性摩擦磨损试验机相连的装置，用于再现生物材料的体外磨损情况，从而能够测量力和摩擦系数。该装置由一个与摩擦磨损试验机相连的结构组成，该结构将其往复直线运动转换为包含测试所需生物材料样品的机械组件的振荡运动。用于测试的摩擦副由超高分子量聚乙烯（UHMWPE）与奥氏体不锈钢AISI 316L在干润滑条件下组成。结果表明，线性模式和振荡模式下的摩擦系数值以及振荡模式下的UHMWPE寿命曲线与文献中在干润滑环境下测试所引用的值一致。此外，UHMWPE样品寿命曲线显示磨损率降低，这可以通过一种磨损机制相对于其他机制的优势来解释。体积磨损随循环次数的增加而增加。
