根据对低碳钢解理断裂显微特征分析的结果,以相邻解理系统失配作为裂纹过界扩展的阻力源,建立了解理裂纹过界扩展的临界条件,并根据解理系统的空间分布的统计特性,对裂缝试样的解理断裂行为进行了计算模拟。计算结果与实验结果一致。
In the light of research on the microfeature of cleavage fracture oflow carbon steel, the stress criterion for cleavage crack propagating across ferritegrain boundary was established on the supposition that resistance to the propaga-tion results from an arbitrary mutual orientation of the cleavage planes in theneighbouring grains. On the basis of concept of statistical spatial distribution ofcleavage plane, the characteristic of probability on cleavage process was expounded,and the fracture stress of the cracked specimen over temperature range in whichfracture is initiated by cleavage mechanism was calculated by means of finite ele-ment analysis programm and the calculated result was found in agreement with thatmeasured.
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