【摘要】 根据以前的混凝土Ⅰ-Ⅱ复合型断裂实验资料,同时采用数值模拟实验的方法,基于双K断裂准则,分别计算了混凝土Ⅰ-Ⅱ复合型断裂试件失稳断裂破坏时,断裂过程区影响的临界有效裂缝长度ac及应力强度因子KⅠ、KⅡ。根据分析计算结果,建立了考虑断裂过程区的新的Ⅰ-Ⅱ复合型断裂K判据,并与课题组以前的K判据作了分析比较。更多还原

【Abstract】 According to the double K fracture criterion,the critical effective crack length ac and stress intensity factors ofⅠ-Ⅱ mixed-mode fracture specimens are calculated based on the data of the experiment done before and the data of present numerical simulation experiment.In the calculation of the critical effective crack length ac and stress intensity factors,the influence of the fracture process zone is considered.Based on the obtained result,a new K criterion ofⅠ-Ⅱ mixed-mode fracture considering the fracture process zone is established and compared with the K criterion before.更多还原