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本文论述求混凝土、纤维混凝土试件在小于断裂荷载的外力作用下，裂纹的非线性扩展及如何用它来确定材料的断裂韧度。另介绍了作者提出的纤维混凝土的一般拉伸软化曲线及分析裂纹构件最大断裂荷载的有关方法。
This article discusses the nonlinear expansion of cracks in concrete and fiber reinforced concrete specimens under external forces less than the fracture load and how to use it to determine the fracture toughness of materials. In addition, the general tensile softening curves of fiber reinforced concrete proposed by the author and methods for analyzing the maximum fracture load of cracked components are introduced.