The delaminationcrack and its effect on the fracture of pipeline steel were investigated by drop-weight tear test(DWTT)at different temperature and micrograph analysis.
It was indicated that the delamination cracking is caused by the effect of 3d stress on the weak interfaces during deformation and appears before beginning or acceleration of main crack.
结果表明，分层裂纹是受力变形时管线钢内部的薄弱界面受到三维应力作用的结果。
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In this paper, a modified VCCT (Virtual Crack Close Technology) is developed to compute strain energy release rates of tire belt (a kind of composite structure) under different delamination lengths.