摘要
焊接接头中的蠕变裂纹扩展受材料组分不均匀和坡口形式等多个因素影响,是一个高度复杂的力学问题。本研究提出了一个能综合反映各影响因素的等效蠕变应变速率概念和计算方法,并在此基础上建立了焊缝裂纹高温断裂力学参量C*的工程计算式。紧凑拉伸试样的有限元分析表明,本研究方法估算的结果与数值解非常接近。
Creep crack growth (CCG) analysis and residual life prediction of the mismatched weldment is a high degree mechanical problem since it is affected by many factors such as material nonhomogeneity of weld, base and heat affected zone and geometry of the weldment and its constituents and the location of preexisting cracks A concept of equivalent creep strain rate (ECSR) and the corresponding calculation approach, which could reflect the influence of all factors, were presented in this work On the basis of the proposed ECSR and reference stress, an estimation approach for high temperature fracture mechanics parameter C* was then derived Nonlinear finite element analysis of 48 compact tension specimens with lowmismatch and overmismatch in creep behaviour has been performed Overall good agreement between the proposed method and the FE results provide confidence in the use of the proposed method in practice
出处
《材料工程》
EI
CAS
CSCD
北大核心
2003年第10期3-6,共4页
Journal of Materials Engineering
基金
国家杰出青年基金资助项目 ( 5 0 2 2 5 5 17)
国家"十五"科技攻关项目 ( 2 0 0 1BA80 3 B0 3 )
关键词
蠕变裂纹
高温断裂力学参量
非均质焊缝
creep crack
high-temperature fracture mechanics parameter
mismatched weldment
