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根据线弹性断裂力学，推导出了复合型裂纹的最大拉应变断裂准则，并与最大拉应力理论、应变能密度因子理论作了比较、分析；最后引用了大量试验资料验证了最大拉应变理论的适用性。
According to the linear elastic fracture mechanics, the maximum tensile strain fracture criterion of composite cracks is deduced and compared with the maximum tensile stress theory and strain energy density factor theory. Finally, a large number of experimental data are cited to verify the theory of maximum tensile strain. applicability.