Cyclic loading/unloading non-closure hysteresis behavior of fiber-reinforced ceramic-matrix composites (CMCs) are investigated. Variable matrix fragmentation density upon loading/unloading is considered and incorporated into the micromechanical hysteresis loops models. Relationships between non-closure hysteresis loops, inverse tangent modulus, and interface counter slip/new slip ratio are established. Experimental non-closure hysteresis loops of different SiC/SiC composites are predicted. Effects of composite constituent and interface properties on non-closure hysteresis loops of SiC/SiC are analyzed. Due to variable matrix fragmentation density, the loading strain at peak stress is higher than unloading strain and the residual strain is much less than that of constant matrix fragmentation density.

研究了纤维增强陶瓷基复合材料（CMC）的循环加载/卸载非闭合滞后行为。考虑加载/卸载时可变的基质碎裂密度，并将其合并到微机械磁滞回线模型中。建立了非闭合磁滞回线，反正切模量和界面反滑度/新滑度比之间的关系。预测了不同SiC / SiC复合材料的实验非闭合磁滞回线。分析了复合材料成分和界面性能对SiC / SiC非闭合磁滞回线的影响。由于可变的基质碎裂密度，在峰值应力下的加载应变高于卸载应变，并且残余应变远小于恒定的基质碎裂密度。