Integration of Micromechanics and Mesomechanics on Physical Modeling of Characteristics of Composites

在复合材料特性物理模型的基础上，结合细观力学和细观力学对各种复合材料的承载能力进行了预测研究。主要研究结果如下：1.用扫描电子显微镜观察了纤维增强陶瓷复合材料纤维与基体界面的微观结构，并在分子动力学分析的基础上考察了界面的特征。结合细观力学和细观力学的计算结果，编制了承载能力预测的计算机程序。利用该程序对超细晶硬质合金的抗弯强度进行了预测。对腐蚀环境中玻璃纤维增强聚合物复合材料的应力腐蚀开裂宏观裂纹扩展速率进行了合理的解释。我们为计算机程序提供了一个简单的优化计算机代码。利用该程序可以方便地给出指定断裂韧性的陶瓷基复合材料的成分分布。并提出了预测最大承载能力的优化方法。

The study of prediction of load carrying capacity for various kind of composites by integrating micromechanics and mesomechanics on physical modeling of characteristics of composites was made. The results are summarized as follows :1. The microstructure of interface between fibers and matrix of fiber reinforced ceramic composites was observed by a scanning electron microscope and the characteristics at the interface were examined on the basis of the molecular dynamic analysis.2. A computer program to predict load carrying capacity was, developed by integrating the results of micromechanics and mesomechanics. By using this computer program, the bending strength of ultra fine-grained cemented carbides was predicted. A reasonable explanation was also given to the macroscopic crack propagation rate due to stress corrosion cracking in glass fiber reinforced polymer composites in corrosive environments.3. We provided a simple optimization computer code for the computer program. By using the code, the composition profile of ceramic matrix composites for specified fracture toughness was given easily. The optimization method was also proposed to predict the maximum load carrying capacity.