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动态力学分析(DMA)已用于检验由碳基致密碳布制成的复合材料。本文介绍了从环境温度到500℃范围内,其平板和锥体两种结构件的研究,由此法计算求得的拉伸存储模量值,在整个测试温度范围内的任意一点上,其重现性在5%以内。实验证明,这种技术能对样品进行无损分析,确定锥体和平板复合材料力学性能的差别,显示锥体内存在的微弱的各向异性以及沥青基体与化学气相沉积基体的区别,发现了锥体的取向效应。本文还讨论了实验技术的细节和进行力学性能计算时所做的假设。
Dynamic Mechanical Analysis (DMA) has been used to test composites made of carbon-based dense carbon cloth. In this paper, the research on the two structures of plate and cone from ambient temperature to 500 ℃ is studied. The value of tensile storage modulus obtained from this method is calculated at any point within the whole test temperature range, Reproducibility within 5%. Experiments show that this technique can perform non-destructive analysis of the sample to determine the difference between the mechanical properties of the cone and the flat-panel composite, show the weak anisotropy existing in the cone and the difference between the pitch matrix and the chemical vapor deposition matrix, The orientation effect. This article also discusses the details of experimental techniques and the assumptions made when calculating mechanical properties.