超弹TiNi合金机敏摩擦学特性的有限元研究

FEM study of smart tribological properties of pseudo-elastic TiNi alloys

采用有限元法、Vickers压痕和滑动磨损实验研究超弹TiNi合金在法向载荷作用下的机敏摩擦学特性。结果表明:超弹TiNi合金的弹性恢复量大于奥氏体不锈钢,在载荷为0.98 N时,其弹性恢复量是不锈钢的1.30倍,在本实验条件下,其滑动磨损量是奥氏体不锈钢的0.14倍;综合有限元计算结果、Vickers压痕以及滑动磨损实验结果,超弹TiNi合金的机敏摩擦学特性是其塑性变形临界载荷和最大弹性应变增加、塑性区域面积减小以及应力增加速度减缓的综合体现。这种机敏摩擦学特性是TiNi合金具有良好耐磨性的主要原因。

A finite element method （FEM） and Vickers indentation and sliding wear were used to study the smart tribological properties of pseudo-elastic TiNi alloys. The elastic recovery of TiNi alloys is higher than that of austenitic stainless steel, under the normal load of 0.98 N, the elastic recovery of the former is 1.30 times of that of the latter. The volume loss of the TiNi alloy is only 0.14 times of that of the austenitic steel under the sliding wear. Considering the results of FEM and Vickers indentation and sliding wear, the smart tribological properties of pesudo-elastic TiNi alloys are integrative embodiments as follows： increasing plastic deformation critical load and maximum elastic strain, decreasing the plastic deformation region and slowing the stress increasing trend. This smart tribological property is the main reason of high wear resistance of TiNi alloys.