Synergistic effects of hold time and cyclic loading on fatigue hysteresis loops of fiber-reinforced ceramic-matrix composites at elevated temperatures in oxidizing atmosphere
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所属单位：民航学院
发表刊物：ENGINEERING FRACTURE MECHANICS
关键字：Ceramic-matrix composites (CMCs) Fatigue Hold time Hysteresis loops Matrix cracking Interface debonding
摘要：In this paper, the synergistic effects of the hold time and cyclic loading on the fatigue hysteresis loops of fiber-reinforced ceramic-matrix composites (CMCs) at elevated temperatures in air condition are investigated. Based on the analysis of relative frictional sliding between fibers and the matrix in the fiber/matrix interface oxidation and interface wear region, the interface debonded length, interface counter-slip length and interface new-slip length are determined using the fracture mechanics approach. The fatigue hysteresis loops models are developed considering the synergistic effects of hold time and cyclic loading. The relationships between the fatigue hysteresis loops models and internal multiple fatigue damage mechanisms are established. The effects of fiber volume fraction, matrix crack spacing, fatigue stress levels, hold time and oxidation temperature on the fatigue hysteresis loops shape, location and area, fatigue hysteresis modulus and the fiber/matrix interface slip lengths are investigated. The experimental fatigue hysteresis loops, fatigue hysteresis dissipated energy, fatigue hysteresis modulus and the fiber/matrix interface slip lengths of cross-ply SiC/MAS and 2D SiC/SiC composites under cyclic loading for different hold time at elevated temperatures in air condition are predicted.
ISSN号：0013-7944
是否译文：否
发表时间：2018-08-01
通讯作者：李龙彪