期刊
CERAMICS INTERNATIONAL
卷 48, 期 13, 页码 18530-18540出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2022.03.123
关键词
Ceramic matrix composites; Hierarchical porosity; Micromechanical damage; Thermomechanical behaviors
资金
- National Natural Science Foundation of China (NSFC) [52105165]
- Strategic Priority Research Program of Chinese Academy of Sciences [XDA17030100]
This study presents a micromechanical damage model to accurately describe the microstructural damage behaviors of ceramic matrix composites, incorporating matrix-cracking, hierarchical pore nucleation, and fiber breaking mechanisms. Two damage variables are proposed for the damage evolution of matrix and fiber bundles. The model outperforms existing counterparts by capturing microstructural damage mechanisms and allowing quantification of different damage contributions.
This work presents a micromechanical damage model to describe the microstructural damage behaviors of ceramic matrix composites with hierarchical porosity during thermomechanical loading. The microstructure evolution may cause the nonlinear constitutive behavior, and a hierarchical porosity-based elasto-plastic constitutive model was developed. Damage mechanisms of matrix-crack, hierarchical pore nucleation and fiber breaking are incorporated into the formulation of the damage model to describe various micromechanical damage modes of ceramic matrix composites accurately. Two damage variables are proposed for the damage evolution of matrix and fiber bundles. The main damage mechanisms in the matrix are matrix-cracking, and fibers breaking in the fiber bundles. The performance of the proposed damage model is verified by comparing with the existing experimental data. The proposed damage model outperforms the existing counterparts by capturing the microstructural damage mechanism and integrated into the damage model, and the contribution of different damage mechanisms can be quantified. The present work will provide a robust tool for describing the damage behaviors of matrix and fiber bundles in the ceramic matrix composites under thermomechanical loading, as well as allow a more accurate characterization of microstructural damage for a large extent of ceramic matrix composites.
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