层合陶瓷基复合材料多尺度应力—应变计算模型

Multi-scale stress-strain calculation model of laminated ceramic matrix composites

对层合陶瓷基复合材料(CMCs)的应力-应变行为进行了研究。基于多尺度分析方法,实现了由组分性能参数到层合陶瓷基复合材料整体应力-应变的计算。采用可实现单向纤维增强陶瓷基复合材料应力-应变计算的细观力学模型,由材料的细观组分性能计算出单向板的非线性弹性性能,并将单向板的弹性性能作为层合复合材料模型的输入参数,通过有限元法计算层合陶瓷基复合材料的整体应力-应变响应。与试验数据的对比表明:采用该模型可以实现层合陶瓷基复合材料在单调拉伸载荷及拉伸加卸载条件下应力-应变曲线的预测,其中数据的最大偏离为19.61%.

The stress-strain behavior for laminated ceramic matrix composites （CMCs）was studied.A model of calculating the stress-strain behavior for CMCs directly from constituent parameters was presented based on multi-scale method.On the basis of the micromechanical model of unidirectional fiber reinforced CMCs,the nonlinear mechanical response of unidirectional laminate can be calculated from the mechanical parameters of constituents.Subsequently,the stress-strain response of the entire composites can be obtained from the response of unidirectional laminate by finite element methods.The predicted stress-strain curves of laminated CMCs under monotonic tensile and repeated loading were acceptable if compared with the experimental results.Among these curves and their corresponding experimental results,the biggest deviation was 19.61%.