In this work, we study the mechanical response of shape memory alloy (SMA) wire reinforced composites using a recently developed novel discrete particle model. In this model, the discrete particles interact through forces specified by the continuum thermoelastic free energy of the material. We study the formation and evolution of fine microstructure in the SMA composites with different matrix properties under thermal and mechanical loads. The effect of phase transformation and detwinning in the SMA on the overall mechanical response of the composite is studied. The elastic modulus of the matrix has a significant effect on the formation of the microstructure of the SMA. This in turn affects the overall damping response of the composite. Interestingly, in the case with high Young’s modulus of the matrix, a retwinning process is observed upon unloading a detwinned wire. These results provide insights for the design and analysis of SMA composites.

在这项工作中，我们使用最近开发的新型离散粒子模型研究形状记忆合金 (SMA) 线增强复合材料的机械响应。在该模型中，离散粒子通过由材料的连续热弹性自由能指定的力相互作用。我们研究了在热和机械载荷下具有不同基体特性的 SMA 复合材料中精细微结构的形成和演变。研究了 SMA 中的相变和去孪晶对复合材料整体机械响应的影响。基体的弹性模量对SMA微结构的形成有显着影响。这反过来又会影响复合材料的整体阻尼响应。有趣的是，在矩阵杨氏模量高的情况下，在卸载解绞线时观察到重新缠绕过程。这些结果为 SMA 复合材料的设计和分析提供了见解。