Editorial Department of Advances in Aeronautical Science and Engineering
Doi
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 probability 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 obtained by the non-parametric method are in good agreement with the sample histograms
