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中文摘要：
针对TiNi合金准静态拉伸中的特殊现象，以万能材料试验机（MTS）上所获得的实验数据为基础，结合弹塑性理论，把一种形状记忆合金的本构关系从一维推广到了三维。同时为ABAQUS数值模拟编写了用户子程序UMAT，模拟中观察到了TiNi合金的异常断裂行为，和实验现象保持了良好的一致性，这为形状记忆合金的实验设计提供了理论参考。
英文摘要：
For the particular phenomenon in the quasi-static stretching of TiNi alloy, a one-dimensional constitutive relation of shape memory alloy （SMA） is extended to three dimension based on experiments and elastoplastic theory. Quasi-static experiments are conducted on a hydraulically driven load frame （Material test system, MTS）. A user defined material subroutine （UMAT） is developed for ABAQUS application. Simulations for the abnormal fracture behavior of TiNi alloy are conducted and the results show a good accordance with the experimental results. All that can afford a certain reference for the experimental design of SMA.
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