2.5维C/SiC复合材料经向拉伸性能  

Tensile property of 2.5D C/SiC composites in warp direction

作　　者：孔春元[1] 孙志刚[1] 高希光[1] 宋迎东[1] 

机构地区：[1]南京航空航天大学能源与动力学院,南京210016

出　　处：《复合材料学报》2012年第2期192-198,共7页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金(51075204);航空科学基金(2009ZB52028);南京航空航天大学基本科研业务费专项科研项目资助

摘　　要：将微观尺度的强度预测模型与单胞尺度有限元模型相结合,建立了2.5维C/SiC复合材料的双尺度强度预测模型。该模型首先计算微观尺度的应力-应变曲线以及最终失效时的力学性能,然后将其带入单胞模型,对不同边界条件下单胞模型的弹性模量进行折减,统计单胞模型的平均应力与应变,最后得到单胞尺度的应力-应变关系和最终失效时的力学性能。通过2.5维C/SiC复合材料常温和高温条件下的经向单轴拉伸试验,得到了2.5维C/SiC复合材料经向拉伸过程的应力-应变曲线以及最终失效时的力学性能。结果表明,理论分析结果与实验值基本一致,验证了该方法的有效性。A method to predict the strength of 2.5D C/SiC composite was developed,which combined the strength prediction method in micro-scale and FEM model in meso-scale.Strain-stress curve and mechanics properties at the failure point in meso-scale were gotten by calculating the strain-stress curve and mechanics properties at the failure point in micro-scale,diminishing the elastic modulus of elements,and calculating the average strain and stress with different boundary conditions.The tensile propriety was tested at normal and high temperature,meanwhile,the strain-stress curve and mechanics properties at failure point were gotten.The results show that the theoretical results can fit the experimental results well and the theoretical method is validity.

关 键 词：2.5维C/SiC复合材料 双尺度模型 常温和高温 应力-应变行为 刚度折减 

分 类 号：TB330.1[一般工业技术—材料科学与工程]