ABSTRACT In this paper, the synergistic effects of interface slip and fiber fracture on stress-dependent mechanical hysteresis of SiC/SiC ceramic-matrix minicomposites (mini-CMCs) are investigated. Upon cyclic loading/unloading, the relative slip between the fiber and the matrix, and the fracture fiber affect the hysteresis behavior of mini-CMCs. The micro-stress field of the damaged mini-CMCs is obtained through shear-lag analysis, and cyclic loading/unloading hysteresis strain is related with the stress level, interface slip, and broken fiber. The effects of constituent properties and internal damage state on cyclic loading/unloading interface slip and hysteresis loops of SiC/SiC minicomposite are analyzed. The experimental matrix cracking density, stress-dependent mechanical hysteresis and interface slip of Hi-NicalonTM, Hi-NicalonTM Type S, and TyrannoTM ZMI SiC/SiC minicomposites are predicted. The interface debonding and slip range, and mechanical hysteresis loops of SiC/SiC minicomposites are affected by the stress level, constituent properties of the fiber volume, interface properties, and damage state of matrix cracking and broken fiber subjected to cyclic tensile loading.

中文翻译：

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界面滑移和纤维断裂对 SiC/SiC 微型复合材料应力相关机械滞后的协同作用

摘要 在本文中，界面滑移和纤维断裂对 SiC/SiC 陶瓷基质微型复合材料 (mini-CMC) 的应力相关机械滞后的协同作用进行了研究。在循环加载/卸载时，纤维与基体以及断裂纤维之间的相对滑移会影响微型 CMC 的滞后行为。通过剪切滞后分析得到受损微型CMC的微应力场，循环加载/卸载滞后应变与应力水平、界面滑移和断纤维有关。分析了成分特性和内部损伤状态对SiC/SiC微复合材料循环加载/卸载界面滑移和滞后回线的影响。Hi-NicalonTM、Hi-NicalonTM Type S 的实验基体开裂密度、应力相关机械滞后和界面滑移，和 TyrannoTM ZMI SiC/SiC 微型复合材料。SiC/SiC微型复合材料的界面脱粘和滑移范围以及机械滞后回线受应力水平、纤维体积的组成特性、界面特性以及在循环拉伸载荷下基体开裂和断裂纤维的损伤状态的影响。