为了研究复杂应力下多孔SMA的超弹性特性,用一热力学有限元模型对带中心孔宽板在双轴拉应力作用下孔临界区域的应力分布以及相变情况进行了有限元模拟计算.初始时,平板处于奥氏体状态,在载荷作用下,在圆孔边界处首先发生相变,并随着载荷的增加,相变区域逐渐向内部扩展.在计算中,两个加载方向同时加载,并采用了不同的加载比例R.随着加载比例的增大,圆孔周围完全发生马氏体相变的区域逐渐增大,等效应力分布也发生变化.随着2-方向加载水平的增加,1-方向的应力-应变滞后环位置逐渐逐渐降低,马氏体相变临界应力也逐渐减小.同时确立了应力空间(σ11,σ12)上的相变初始面.
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