单向陶瓷基复合材料循环迟滞模型研究

Cyclic Hysteresis Models of Unidirectional Ceramic Matrix Composites

为了模拟单向陶瓷基复合材料(Ceramic matrix composites, CMCs)在受到疲劳加载时的应力-应变关系,建立不同循环次数、不同疲劳峰值载荷的单向陶瓷基复合材料疲劳迟滞回线理论模型。将加载过程分为4个阶段且脱粘区域由新正向滑移区域、旧正向滑移区域和反向滑移区域组成,卸载过程滑移区域分为新正向滑移区域和反向滑移区域。分析了加载和卸载各个区域纤维轴向应力分布,推导了4个加载阶段和卸载对应的疲劳应力应变关系。预测了单向陶瓷基复合材料在不同峰值应力和不同循环的疲劳迟滞曲线,发现预测结果与文献中实验结果吻合较好。

In order to simulate the stress-strain curve of unidirectional ceramic matrix composites(CMCs)under fatigue loading,a theoretical model of the fatigue hysteresis curve of unidirectional CMCs with different cycles and different fatigue peaks is developed.The loading process is divided into four stages and the slip zone consists of the new forward slip zone,the old forward slip zone and the reverse slip zone,while the slip zone of the unloading process is divided into the new forward slip zone and the reverse slip zone.The axial stress distribution of the fibres in each region of loading and unloading is analyzed,and the fatigue stress-strain relationships corresponding to the four loading stages and unloading are derived.The fatigue hysteresis curves of unidirectional CMCs are predicted for different peak stresses and different cycles,and the predicted results are in good agreement with the experimental results in the literature.