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研究了室温下针刺C/SiC复合材料的静拉伸应力-应变行为。基于显微CT技术重构的微观型貌,选取恰当的代表体积单元,建立了针刺C/SiC复合材料应力-应变性能预测的单胞模型。基于可实现任意加卸载下单向纤维增强C/SiC复合材料应力-应变计算的界面摩擦模型,由材料的细观组分性能计算出单向纤维束层的应力-应变响应,然后将单向纤维束层的应力-应变响应代入到单胞模型中,通过有限元法计算得到针刺C/SiC复合材料的整体应力-应变响应。进行了针刺C/SiC复合材料静拉伸试验,测得材料的应力-应变响应,计算结果与试验吻合较好。
The static tensile stress-strain behavior of acupuncture C / SiC composites at room temperature was studied. Based on the micromorphology reconstructed by micro-CT, a single cell model for predicting the stress-strain behavior of acupuncture C / SiC composites was established by selecting suitable representative volume elements. Based on the interfacial friction model of uniaxial fiber reinforced C / SiC composite under arbitrary loading and unloading, the stress-strain response of the unidirectional fiber bundle layer is calculated from the meso-component properties of the material, and then the unidirectional The stress-strain response of fiber bundles was substituted into the single cell model and the overall stress-strain response of the acupuncture C / SiC composites was calculated by the finite element method. The static tensile test of acupuncture C / SiC composites was carried out and the stress-strain response of the material was measured. The calculated results are in good agreement with the experimental data.