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首页> 外文期刊>Smart Materials & Structures >A geometrical approach to determine reorientation start and continuation conditions in ferromagnetic shape memory alloys considering the effects of loading history
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A geometrical approach to determine reorientation start and continuation conditions in ferromagnetic shape memory alloys considering the effects of loading history

机译：考虑加载历史影响的确定铁磁形状记忆合金重新取向开始和继续条件的几何方法

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摘要

Ferromagnetic shape memory alloys (FSMAs) and magnetic shape memory alloys (MSMAs) are metallic alloys that can undergo inelastic responses when exposed to magnetic fields. Several constitutive models have been proposed so far to model the behaviors of FSMAs. In this work, the effects of loading history on reorientation start conditions are considered, and it is shown that reorientation start conditions are not fixed values; rather, they change with respect to the amount of loading history. To consider the effects of loading history on reorientation start conditions, an available phase diagram in stress-field space is generalized to reorientation surfaces in stress-field-loading history space. Correspondingly, kinetic laws are derived in a continuum framework to be used with the reorientation surfaces to determine the amount of the martensitic variant 2 volume fraction. Based on the geometry of the reorientation surfaces, conditions that must be satisfied to ensure the continuation of reorientations are obtained. Available experimental findings validate the proposed model and the reorientation surfaces.
机译：铁磁形状记忆合金（FSMA）和磁形状记忆合金（MSMA）是金属合金，当暴露于磁场时会发生非弹性响应。迄今为止，已经提出了几种本构模型来对FSMA的行为进行建模。在这项工作中，考虑了加载历史对重新定向开始条件的影响，结果表明重新定向开始条件不是固定值。相反，它们会根据加载历史记录的数量发生变化。为了考虑加载历史对重新定向开始条件的影响，将应力场空间中的可用相位图推广到了应力场加载历史空间中的重新定向表面。相应地，在连续框架中导出动力学定律，以与重新定向表面一起使用以确定马氏体变体2的体积分数。基于重新定向表面的几何形状，获得了必须满足的条件以确保重新定向的连续性。可用的实验结果验证了所提出的模型和重新定向表面。

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