本文对文献(1]、[2]、[3]中所建议的非线性能量率■及所定义的非线性断裂韧性■。作了综述,对非线性断裂韧性的意义进行了评价,提出了可讨论的问题并进行了分析;对试验数据进行了分析,得出了该方法测得的■。值是条件材料常数的结论,同时提出了在实际应用中的困难及可采用的近似方法. In this paper, the non-linear energy rate and the defined nonlinear fracture toughness proposed in the literatures (1), [2] and [3] are reviewed, and the significance of nonlinear fracture toughness is evaluated. The problems that can be discussed are analyzed and analyzed; the experimental data are analyzed, and the conclusion that the value measured by the method is the conditional material constant, and the difficulties in actual application and the approximate methods that can be used are also proposed.