二维编织C/SiC复合材料非线性损伤本构模型与应用

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。

A non-linear damage constitutive model for 2D woven C/SiC composite material and its application

Based on the fundamental mechanical tests of 2D woven C/SiC composite material, a macroscopic orthotropic non-linear damage constitutive model was established. In this model, the detectable strains were chosen as variables, and functions in simple form were used to demonstrate the stress-strain relationship of the material under damage evolution caused by uniaxial tension and shear loads, and besides the rule of stiffness change in unloading state respectively. Meanwhile, the unilateral effect and damage-deactivation behavior were also considered. The constitutive model was implemented into UMAT in ABAQUS finite element software, and it could describe the material’s non-linear and linear property of stress-strain relationship in loading and unloading state respectively, and also its load history. Through modeling the open hole plates in tension, strain distribution besides the hole agrees well with the experiment result, which proves the availability of the proposed constitutive model.