单向陶瓷基复合材料任意应力本构行为快速计算方法

为了实现快速预测陶瓷基复合材料(CMCs)任意应力加卸载作用后的损伤状态和本构行为,对CMCs任意应力加卸载力学行为进行研究。提出了任意应力加卸载曲线简化方法,得到仅包含决定CMCs损伤状态的等效载荷曲线。基于剪滞模型,直接给出CMCs在等效载荷曲线作用后的滑移区分布,避免对载荷曲线的逐点计算。进而预测了材料的损伤状态和应力应变行为。将原始加卸载曲线带入剪滞模型,计算CMCs滑移区分布和应力应变,并与本文提出的方法进行比较,结果表明,两种计算方法计算的结果一致,说明了本文提出的载荷曲线简化方法和滑移区分布计算方法是可行的。

Efficient Calculation Method for Constitutive Behavior of Unidirectional Ceramic Matrix Composites under Arbitrary Loading

In order to rapidly predict the damage state and constitutive behavior of ceramic matrix composites (CMCs) under arbitrary loading, the mechanical behavior of CMCs under arbitrary loading was studied. A simplified method of arbitrarily load curve was proposed, and the equivalent load curve that determines the damage state of CMCs was obtained. The distribution of slip regions of unidirectional CMCs (UD-CMCs) under equivalent load curve was obtained based on the shear lag model. Then damage state and the stress-strain behavior of CMCs were predicted. In order to verify the accuracy of the method proposed in this paper, the original load curve was introduced into the shear lag model, and the distribution of slip regions and stress-strain behavior of CMCs were calculated. The results obtained by two methods are consistent, which proves that simplification method of stress load curve and the calculation method of distribution of slip regions proposed in this paper are feasible.