Acta Metallurgica Sinica (English Letters) ›› 1990, Vol. 3 ›› Issue (4): 282-286.

• • 上一篇    下一篇

MODEL OF CLEAVAGE CRACK PROPAGATION ACROSS BOUNDARY

HUANG Zheng Institute of Physics,Academia Sinica,Beijing,ChinaYAO Mei Harbin Institute of Technology,Harbin,China Correspondent:HUANG Zheng Post-doctorial Assistant,Institute of Physics,Academia Sinica,Beijing 100080,China   

  • 收稿日期:1990-08-25 修回日期:1990-08-25 出版日期:1990-08-25 发布日期:2009-10-10

MODEL OF CLEAVAGE CRACK PROPAGATION ACROSS BOUNDARY

HUANG Zheng Institute of Physics,Academia Sinica,Beijing,ChinaYAO Mei Harbin Institute of Technology,Harbin,China Correspondent:HUANG Zheng Post-doctorial Assistant,Institute of Physics,Academia Sinica,Beijing 100080,China   

  • Received:1990-08-25 Revised:1990-08-25 Online:1990-08-25 Published:2009-10-10

PDF (PC)

471

摘要： <正> In the light of analysis of the features of cleavage fractographs of low carbon steel,the stresscriterion for cleavage crack propagation across ferrite grain boundary was established on thesupposition that resistance to the propagation results from an arbitrary mutual orientation ofthe cleavage plans in the neighbouring grains.On the basis of concept of statistical distribu-tion of cleavage plane in space,the probabilistic characteristic of cleavage process was ex-pounded,and the fracture stress of the cracked specimen over temperature range in whichfracture is initiated by cleavage mechanism was calculated by means of finite element analysisprogram and the calculated result was found to be in agreement with that measured.

Abstract: In the light of analysis of the features of cleavage fractographs of low carbon steel,the stress criterion for cleavage crack propagation across ferrite grain boundary was established on the supposition that resistance to the propagation results from an arbitrary mutual orientation of the cleavage plans in the neighbouring grains.On the basis of concept of statistical distribu- tion of cleavage plane in space,the probabilistic characteristic of cleavage process was ex- pounded,and the fracture stress of the cracked specimen over temperature range in which fracture is initiated by cleavage mechanism was calculated by means of finite element analysis program and the calculated result was found to be in agreement with that measured.

Key words: cleavage, fracture mechanism, finite element analysis, criterion