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试样裂纹扩展的稳定性对断裂韧度的测试具有重要影响，尤其是对尺寸较大的混凝土试样。本文根据裂纹扩展稳定性因子，分析紧凑拉伸试样裂纹扩展的稳定性及混凝土试样尺寸大型化对裂纹扩展稳定性的影响。
The stability of the specimen’s crack propagation has important influence on the testing of fracture toughness, especially for larger concrete specimens. In this paper, based on the crack growth stability factor, the stability of the crack propagation of a compact tensile specimen and the effect of the size of the concrete specimen on crack propagation stability are analyzed.