Model and test validation of stress-strain for needled C/SiC composites
-
摘要: 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。Abstract: The stress-strain behavior for needled C/SiC composites was studied under static tensile loading at room temperature. A unit-cell model to predict the stress-strain properties for needled C/SiC composites was presented based on the representative volume element which was chosen according to the microstructure by micro CT technology reconstruction. Based on the interfacial friction model which is capable of stress-strain calculation of unidirectional fiber reinforced C/SiC composites under arbitrary loading/unloading procedure, the stress-strain response of unidirectional fiber bundle layer can be calculated from the properties of material mesoscopic constituents. By substituting the stress-strain response of unidirectional fiber bundle layer into the unit-cell model, the stress-strain response of the entire needled C/SiC composites can be obtained by finite element methods. By performing static tensile test of needled C/SiC composites, the predicted stress-strain responses match well with the test results.
点击查看大图
计量
- 文章访问数: 727
- PDF下载量: 1695
- 被引次数: 0