复合材料宏观强度准则预测能力分析

对复合材料宏观强度准则进行了总结和评述,对最具有代表性的5种强度准则的预测能力进行了综合评估。首先,由各强度准则得到了不同平面应力状态下AS4/3501-6材料的理论失效包线,以此阐明了各强度准则的物理本质。然后,考虑到强度的分散性,采用Monte-Carlo方法并基于各强度准则建立了4种材料的概率失效包线和强度分散带。最后,结合多组试验数据,客观评估了各强度准则的预测能力。评估结果表明:各强度准则的预测结果都不可能完好地吻合所有的试验结果;相比于Max-Stress准则、Hashin准则和Tsai-Wu准则,Puck准则和LaRC03准则的预测能力相对较好,且对复合材料的损伤机理有更为合理的解释。

Prediction ability analysis of macroscopic strength criteria for composites

Macroscopic strength criteria for composites were summarized and reviewed. The prediction abilities of five of the most representative strength criteria were analyzed comprehensively. Firstly, the theoretical failure envelopes of AS4/3501-6 material under different plane stress states were established based on each strength criterion, which were used to show the physical significance of each strength criterion. Then, considering the dispersity of strength, probabilistic failure envelops and strength scattering zones for four kinds of materials were set up based on each of the strength criterion with the Monte-Carlo method. Finally, several groups of experiment data were adopted to evaluate the prediction abilities of each strength criterion objectively. The evaluation results show that prediction results of every strength criterion are impossible to match all of the test results perfectly. Compared to the Max-Stress criterion, Hashin criterion and Tsai-Wu criterion, the prediction abilities of Puck criterion and LaRC03 criterion are relatively better, and have more reasonable explanation for damage mechanisms of composites.