MODEL OF CLEAVAGE CRACK PROPAGATION ACROSS BOUNDARY
解理裂缝过界扩展模型

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.