残余应力对纳米晶超弹性NiTi形状记忆合金等温拉伸行为的影响
Effects of residual stress on the isothermal tensile behavior of nanocrystalline superelastic NiTi shape memory alloy
AI总结：
本文研究残余应力对纳米晶超弹性NiTi形状记忆合金等温拉伸行为的影响，采用FIB-DIC法测量二维残余应力，发现其显著降低相变应力，为残余应力工程调控力学行为提供依据。
摘要：
残余应力对材料的力学行为有很大影响。本文研究了残余应力对NiTi形状记忆合金等温拉伸行为的影响。将聚焦离子束与数字图像相关法相结合，测量了经预应变激光冲击喷丸处理的纳米晶NiTi板材中的二维残余应力。四点弯曲实验验证了该测量方法的准确性。FIB-DIC方法是测量相变纳米晶材料中二维残余应力的一种有吸引力的工具。内部残余应力显著降低了相变应力，并通过有限元和理论分析研究了其机理。这项工作表明，NiTi形状记忆合金的力学行为可以通过残余应力工程进行调控。
英文摘要：
The residual stress greatly affects the mechanical behavior of a material. In this work, the effect of residual stress on the isothermal tensile behavior of a NiTi shape memory alloy is studied. The focused ion beam and digital image correlation are combined to measure the two-dimensional residual stress in nanocrystalline NiTi plates processed with prestrain laser shock peening. A four-point bending experiment verified the accuracy of this measurement method. The FIB-DIC method is an attractive tool for measuring the two-dimensional residual stress in phase transition nanocrystalline materials. The internal residual stress significantly decreases the phase transition stress, and the mechanism is studied via finite element and theoretical analyses. This work implies that the mechanical behavior of NiTi shape memory alloys can be tailored via residual stress engineering.
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