FRACTAL RESEARCH ON CRACKS PROPAGATION OF GAS PIPELINE X52 STEEL WELDING LINE UNDER HYDROGEN ENVIRONMENT
来源期刊：Acta Metallurgica Sinica2001年第3期
论文作者：Q.Wu S.H.Dong Y.M.Lu Y.Zhang
Key words：hydrogen environment; welding line; cracking; ductile; fractal di mension;
Abstract: Based on the theory of hydrogen enhanced localized plasticity of the hydrogen induced cracking and considered the effect of residual stress produced by eliminated stress heattreatment, a fractal model of hydrogen induced cracking was presented, and a relationship among the effective surface energy T( H), fractal dimension D and stress intensity factor of hydrogen induced cracking, KIH, for welding pipeline under hydrogen environment was set up, from which the relationship of D and KIsCC is obtained. The model was verified experimentally to be correct.
Q.Wu1，S.H.Dong2，Y.M.Lu2，Y.Zhang3
(1.Yan Shan University, Qinhuangdao 066004, China;
2.Mechanics Electronic Department, University of Petroleum, Beijing 102200, China;
3.Department of Material Physics, University of Science and Technology Beijing, Beijing 100083, China)
Abstract:Based on the theory of hydrogen enhanced localized plasticity of the hydrogen induced cracking and considered the effect of residual stress produced by eliminated stress heattreatment, a fractal model of hydrogen induced cracking was presented, and a relationship among the effective surface energy T( H), fractal dimension D and stress intensity factor of hydrogen induced cracking, KIH, for welding pipeline under hydrogen environment was set up, from which the relationship of D and KIsCC is obtained. The model was verified experimentally to be correct.
Key words:hydrogen environment; welding line; cracking; ductile; fractal di mension;
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