基于多微凸体有限元分析的超弹TiNi合金磨损机制

对三种不同超弹性的TiNi合金及20MnV钢表面多微凸体在法向栽荷作用下的模型进行了有限元分析，并对超弹TiNi合金的磨损机制进行了探讨。结果表明，由于TiNi合金具有较高的最大弹性变形量，在相同栽荷下，表面上参加接触的微凸体数目随着超弹性的增加而增多,产生的弹性接触面积及最大Mises弹性应变要明显大于20MnV；塑性接触面积及最大Mises塑性应变相对减小。弹性变形能力的增强和塑性应变的减小可以使TiNi合金缓解外部的冲击并能够在磨损过程中抵抗较多的循环栽荷，从而表现出良好的耐磨性。

Pseudoelastic TiNi Alloys Wear Mechanism Based on the Finite Element Analysis of Muti-asperities

A finite element analysis of multi-asperities on the surfaces of three TiNi alloys with different pseudoelasticity and steel 20MnV under normal loads was carried out. In addition, a discussion of pseudoelastic wear of TiNi alloy mechanism was also performed. Results show that under the same load, the amount of contacting asperity on surface of TiNi alloy increases with increasing of the pseudoelasticity; the elastic contacting area and maximum Mises elastic strain of the TiNi alloy are relatively low, but obviously higher than those of 20MnV steel. Generally speaking, the improvement of elastic deformation capability and decreasing of the plastic strain make TiNi alloy reduce the impact of particles and resist more times circular loads during wear process. Because of this character, the pseudoelastic TiNi alloy shows high wear resistance.