Abstract In this paper, the damage accumulation and life prediction in fiber-reinforced ceramic-matrix composites (CMCs) subjected to thermomechanical fatigue (TMF) loading are investigated. The relationships between TMF damage mechanisms, fatigue hysteresis-based damage parameters, fraction of broken fiber, and applied cycles are established. Evolution of fatigue hysteresis dissipated energy, fatigue hysteresis modulus, fatigue peak strain, fatigue broken fiber fraction versus applied cycle curves, and the fatigue life S–N curves is analyzed. Damage accumulation and fatigue life of cross-ply silicon carbide/magnesium aluminosilicate composite under in-phase (IP)- and out-of-phase (OP)-TMF and isothermal fatigue (IF) loading are predicted. Under the same fatigue peak stress, the fatigue lifetime decreases from IF loading at 566°C to IF loading at 1,093°C, IP-TMF and OP-TMF. The TMF loading significantly reduced the fatigue lifetime of CMCs.

中文翻译：

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热机械疲劳载荷下纤维增强陶瓷基复合材料的损伤累积及寿命预测

摘要 本文研究了纤维增强陶瓷基复合材料（CMCs）在热机械疲劳（TMF）载荷作用下的损伤累积和寿命预测。建立了 TMF 损伤机制、基于疲劳滞后的损伤参数、断裂纤维的分数和应用循环之间的关系。分析了疲劳滞后耗散能量、疲劳滞后模量、疲劳峰值应变、疲劳断裂纤维分数与应用循环曲线以及疲劳寿命 S-N 曲线的演变。预测了在同相 (IP) 和异相 (OP)-TMF 和等温疲劳 (IF) 载荷下交叉层碳化硅/镁铝硅酸盐复合材料的损伤累积和疲劳寿命。在相同的疲劳峰值应力下，疲劳寿命从 566°C 的 IF 载荷降低到 1,093°C 的 IF 载荷、IP-TMF 和 OP-TMF。TMF 加载显着降低了 CMC 的疲劳寿命。