2 1/4Cr-1Mo鋼溶接部Type III およびType IV クリープ損傷のミクロ・マクロシミュレーション
2 1/4Cr-1Mo鋼溶接部Type III およびType IV クリープ損傷のミクロ・マクロシミュレーション
复制标题
2 1/4Cr-1Mo钢焊缝III型和IV型蠕变损伤的微观-宏观模拟
DOI：
10.2472/jsms.56.106
复制
发表时间：
2007
期刊：
影响因子：
--
通讯作者：
直哉 多田
中科院分区：
文献类型：
--
作者：
川島 扶美子;敏秀 猪狩;巧 時吉;直哉 多田
提出了一种将随机断裂抗力模型与有限元弹性蠕变分析相结合的蠕变损伤过程模拟方法，并将其应用于2 1/4Cr-1 Mo钢焊接接头粗晶热影响区和细晶热影响区的Ⅲ型和Ⅳ型蠕变损伤评估。首先，在细晶热影响区的基础上，基于随机断裂阻力模型，确定了粗晶热影响区的参数，以模拟小缺陷数密度的增加。其次，将细晶热影响区和粗晶热影响区的同时损伤模拟应用于焊接接头模型试验和弯管爆破试验。本文还讨论了根据焊接接头最终失效面上的有效应力来预测焊接接头最终失效时间的可能性。该模拟成功地再现了细晶和粗晶热影响区小缺陷数量密度的增加，并可预测焊接接头的失效时间。
A simulation method of the creep damage progress combining the random fracture resistance model and FEM elastic-creep analysis was proposed and was applied to the evaluation of Type III and Type IV creep damage respectively in the coarse and fine grain heat affected zone (HAZ) in welded joints of 2 1/4Cr-1Mo steel. Firstly following the previous work on the fine grain HAZ, parameters for the coarse grain HAZ were identified for simulating the increase of number density of small defects on the basis of the random fracture resistance modeling. Secondly the simultaneous damage simulation for both fine and coarse grain HAZ was applied to both the welded joint model test and the burst test of elbow. A possibility of predicting the final failure time of welded joint was also discussed on the basis of the effective stress against the final failure surface. The proposed simulation successfully reproduced the increase of the number density of small defects in the fine and the coarse grain HAZ, and could predict the failure time of welded joints.