Shape memory alloys (SMA) are nowadays widely used in different industries. The two extraordinary behaviors of superelasticity and shape memory effect make these alloys a super wear-resistant material. In a range of SMA applications, contact between adjacent surfaces occurs. In this research, a formerly-developed contact model, which individually considers each asperity, is extended to cases where superelastic shape memory alloys are used. Since constitutive equations of SMAs are based on stress and strain, to establish a relationship between classical contact models and the main arguments of these constitutive equations, a representative strain based on the pseudoelastic behavior of SMAs was defined. Experiments were conducted to verify the model’s predictions. In these experiments, a NiTi wire was pressed against a Steel plate; then, the measured penetration in the test and the values predicted by the contact model were compared. The reported results show an acceptable agreement between theory and experiment.

中文翻译：

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超弹性形状记忆合金的机械接触模型

形状记忆合金 (SMA) 如今广泛应用于不同行业。超弹性和形状记忆效应这两种非凡的行为使这些合金成为一种超耐磨材料。在一系列 SMA 应用中，相邻表面之间会发生接触。在这项研究中，以前开发的接触模型单独考虑每个粗糙度，扩展到使用超弹性形状记忆合金的情况。由于 SMA 的本构方程基于应力和应变，为了建立经典接触模型与这些本构方程的主要参数之间的关系，定义了基于 SMA 伪弹性行为的代表性应变。进行了实验以验证模型的预测。在这些实验中，NiTi 丝被压在钢板上；然后，将测试中测得的穿透力与接触模型预测的值进行比较。报告的结果表明理论和实验之间存在可接受的一致性。