航空工程进展2025，Vol.16Issue(4)：63-73,11.DOI:10.16615/j.cnki.1674-8190.2025.04.06
考虑内部损伤随机性的SiCf/SiC复合材料力学性能概率分析
Probabilistic analysis of mechanical properties for SiCf/SiC composites considering internal damage randomness
摘要
Abstract
Ceramic matrix composites(CMCs)experiences internal damage such as fiber pulling out and matrix cracks during usage,which affects the mechanical properties of braided CMCs.For SiCf/SiC 2.5-dimensional braided CMCs,a microscopic finite element model of fiber bundle and a meso finite element model of braided CMCs are established respectively.Considering the randomness of internal damage quantity and location,the pro-bability distributions of mechanical properties of braided CMCs are identified at the meso-scopic level model,and the influence of damage rate on the strength and Young's modulus of the material is studied.Both parametric and non-parametric methods are used to fit the probability distribution of CMCs mechanical properties considering the internal damage randomness.The results show that,with the increase of damage rate,the strength decrease faster than stiffness.In addition,the probability density curves of strength and Young's modulus in warp direction ob-tained by the non-parametric method are in good agreement with the sample histograms.关键词
陶瓷基复合材料/单胞模型/随机损伤/概率分布/非参数方法Key words
ceramic matrix composite/cell model/random damage/probability distribution/non-parametric me-thod分类
航空航天引用本文复制引用
谢学鑫,李洪双..考虑内部损伤随机性的SiCf/SiC复合材料力学性能概率分析[J].航空工程进展,2025,16(4):63-73,11.基金项目
国家科技重大专项(Y2019-Ⅰ-0018-0017) （Y2019-Ⅰ-0018-0017）
