A proposal on creep damage analysis of welded joint of low-alloy steel considering microscopic damage progress
A proposal on creep damage analysis of welded joint of low-alloy steel considering microscopic damage progress
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考虑微观损伤进展的低合金钢焊接接头蠕变损伤分析建议
DOI：
10.2472/jsms.52.631
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发表时间：
2003
期刊：
影响因子：
--
通讯作者：
N. Tada
中科院分区：
文献类型：
--
作者：
F. Kawashima;T. Tokiyoshi;T. Igari;A. Shiibashi;N. Tada
提出了基于随机断裂抗力模型的焊接接头蠕变损伤分析方法，并将其应用于低合金钢焊接接头的蠕变损伤评价。首先，考虑21/4Cr-1Mo钢细晶HAZ材料的应力相关损伤过程，确定了上述模型所必需的晶界随机断裂抗力、小缺陷的起裂驱动力和生长驱动力。其次，具体提出了焊接接头应力分布与随机断裂抗力模型相结合的方法，并将其应用于模型试验和实际动力管道的蠕变损伤评估。该方法成功地再现了焊接接头中小缺陷的时间历程和数量密度分布的实验结果。
Creep damage analysis method of welded joint on the basis of the random fracture resistance model was proposed and was applied to the creep damage evaluation of welded joint of low alloy steel. Firstly a random fracture resistance of grain boundaries, an initiation and a growth driving forces of small defects, which were necessary in the above model, were determined considering the stress-dependent damage progress of the fine-grain HAZ material of 21/4Cr-1Mo steel. Secondly a procedure combining both the stress distribution in the welded joint and the random fracture resistance model was concretely proposed and was applied to the creep damage evaluation of the model test and the actual power piping. Experimental results of both the time history and the distribution of the number density of small defects in the welded joint were successfully reproduced by the proposed method.