School of Engineering, Anhui Agricultural University, Hefei, China.
PLoS One. 2023 Oct 19;18(10):e0290346. doi: 10.1371/journal.pone.0290346. eCollection 2023.
The artificial joint is one of the most effective methods to treat joint injuries. The service performance of artificial joints is gradually weakened because of the wear of artificial joints in actual service. In order to obtain the potential failure mechanism of the artificial joint in actual service, the study was carried out with the multiple factors that affect the service performance of the artificial joint. The experimental study was carried out on the change rule of mechanical behavior of the contact interface between the artificial joint of titanium alloy and cortical bone. The multi-factor is compression load, contact load, friction velocity, and lubrication environment, respectively. The results indicate that the friction coefficient, wear mass, and wear coefficient of Ti-6A1-4V titanium alloy decreased with the increasing of the compression load. The friction rate and the friction coefficient of Ti-6A1-4V titanium alloy decreased with the increasing of the contact load. The wear mass and friction coefficient of Ti-6A1-4V titanium alloy increased with the increasing of contact load. The lubrication effect is better with the increasing of lubricant concentration. Based on the observation of the SEM, the wear type influenced by compression load and friction rate is mainly abrasive wear and oxidation wear. The wear type influenced by contact load is mainly abrasive wear and adhesive wear. The wear type influenced by lubricants is mainly oxidation wear. When wear mass and wear coefficient are used as the criteria for evaluating friction and wear, the order of influential factors to friction and wear of Ti-6Al-4V titanium alloy plate is friction rate, compression load, contact load, and lubricant concentration. This research can provide a theoretical reference for the optimal manufacture of the artificial joint of titanium alloy and optimal rules of safe service conditions.
人工关节是治疗关节损伤最有效的方法之一。由于人工关节在实际使用中的磨损，其使用性能逐渐减弱。为了获得人工关节在实际使用中的潜在失效机制，本研究针对影响人工关节使用性能的多种因素进行了研究。对钛合金人工关节与皮质骨接触界面的力学性能变化规律进行了实验研究。多因素分别为压缩载荷、接触载荷、摩擦速度和润滑环境。结果表明，Ti-6A1-4V 钛合金的摩擦系数、磨损质量和磨损系数随压缩载荷的增加而减小。Ti-6A1-4V 钛合金的摩擦速率和摩擦系数随接触载荷的增加而减小。Ti-6A1-4V 钛合金的磨损质量和摩擦系数随接触载荷的增加而增加。润滑效果随润滑剂浓度的增加而提高。基于 SEM 的观察，受压缩载荷和摩擦速率影响的磨损类型主要为磨料磨损和氧化磨损。受接触载荷影响的磨损类型主要为磨料磨损和粘着磨损。受润滑剂影响的磨损类型主要为氧化磨损。当以磨损质量和磨损系数作为摩擦磨损评价标准时，Ti-6Al-4V 钛合金板摩擦磨损的影响因素顺序为摩擦速率、压缩载荷、接触载荷和润滑剂浓度。本研究可为钛合金人工关节的优化制造和安全使用条件的优化规则提供理论参考。
