It is shown that the fracture of concrete behaved complicatedly and irregularly, which underwent explicitly a subcritical crack growth prior to the unstable crack propagation.
结果表明：混凝土断裂是一个复杂的不规则过程，存在明显的亚临界扩展现象。
Coarsening grain and intercrystalline network ferrite depress crack growth resistance of the materials strongly and result in unstable propagation of crack very easily.
晶粒粗大及晶间网状铁素体强烈降低材料的裂纹扩展阻力，并极易导致裂纹的失稳扩展。
It was observed on unstable rib that the crack propagation mechanisms in both mist and rib regions may transfer into each other.
在不稳定肋状区发现到裂纹在霉纹区和肋状区的扩展机理是可以相互转化的。
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