Pu Jian, Zhang Yali, Zhang Xiaogang, Zhang Xiaoyu, Yuan Xinlu, Wang Zhongyi, Zhang Guoxian, Cui Wen, Jin Zhongmin
School of Mechanical Engineering, Southwest Jiaotong University, Sichuan, Chengdu, 610031, China.
School of Mechanical Engineering, Southwest Jiaotong University, Sichuan, Chengdu, 610031, China.
J Mech Behav Biomed Mater. 2023 Oct;146:106074. doi: 10.1016/j.jmbbm.2023.106074. Epub 2023 Aug 14.
The composite fretting-corrosion damage due to combinations of radial, tangential, rotational, and other fretting causes local adverse tissue reactions and failure of artificial joints. Previous studies have mainly focused on the single fretting mode, while ignoring the coupled effects of multimode fretting. The fretting-corrosion mechanisms between the components are not yet fully understood. In this study, the tangential-radial composite fretting was realized by applying a normal alternating load to the tangential fretting. The composite fretting corrosion behavior of zirconia toughened alumina ceramic/Ti6Al4V alloy used for the head-neck interface of an artificial hip joint under simulated body fluid was investigated. The effects of displacement and alternating load amplitude were considered. The alternating load amplitude was given by the maximum normal load and minimum normal load ratio R. The results showed that the composite fretting damage mechanisms of this pair were mainly abrasion and tribocorrosion. Cracking also existed under large displacement. The effect of alternating load on fretting corrosion was found to be mainly caused by changes in the contact area and instantaneous contact state. In addition, the alternating load during the composite fretting promoted the formation of the three-body layer in the contact area. A decrease in load ratio caused fretting to change from gross to partial slip. In the case of small displacement, the load ratio had little effect on the friction work or wear scar profile. The corrosion rate of materials and the concentration of metal ions released into the solution increased as load ratio decreased. In cases of large and medium displacement, load ratio reduction increased the friction work and expanded the wear scar. The reduction in load ratio also caused the corrosion rate of the material to increase and then decrease, and the metal ion concentration decreased.
由径向、切向、旋转及其他微动组合导致的复合微动腐蚀损伤会引起局部不良组织反应，并导致人工关节失效。以往的研究主要集中在单一微动模式，而忽略了多模式微动的耦合效应。部件之间的微动腐蚀机制尚未完全明确。在本研究中，通过对切向微动施加法向交变载荷来实现切向-径向复合微动。研究了用于人工髋关节头颈界面的氧化锆增韧氧化铝陶瓷/钛合金在模拟体液中的复合微动腐蚀行为。考虑了位移和交变载荷幅值的影响。交变载荷幅值由最大法向载荷与最小法向载荷之比R给出。结果表明，该配对的复合微动损伤机制主要为磨损和摩擦腐蚀。在大位移情况下也存在裂纹。发现交变载荷对微动腐蚀的影响主要由接触面积和瞬时接触状态的变化引起。此外，复合微动过程中的交变载荷促进了接触区域三体层的形成。载荷比的降低导致微动从整体滑移转变为部分滑移。在小位移情况下，载荷比对摩擦功或磨损疤痕轮廓影响不大。随着载荷比降低，材料的腐蚀速率和释放到溶液中的金属离子浓度增加。在大位移和中等位移情况下，载荷比降低会增加摩擦功并扩大磨损疤痕。载荷比降低还会导致材料的腐蚀速率先增加后降低，金属离子浓度降低。
