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.
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
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
