基于二维编织C/SiC复合材料的基本力学性能试验,建立了该材料的宏观正交各向异性非线性损伤本构模型.模型中以可检测的应变作为变量,采用形式简单的函数分别描述了单轴拉伸和剪切加载下的材料损伤演变下的应力-应变关系,以及卸载状态的刚度变化规律.同时,考虑了材料的单边效应以及拉压应力状态转换时的损伤钝化行为.将此本构模型编写成UMAT、子程序并引入ABAQUS有限元软件,可以完整描述该材料的加载非线性和卸载线性的应力-应变关系特征,及其加卸载历史.通过对带孔板的拉伸模拟,孔边应变分布与试验结果吻合较好,验证了本构模型的有效性.
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