Tensile property of 2.5D C/SiC composites in warp direction
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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。
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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
Abstract: 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. -
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