文献类型：期刊文献

中文题名：非匹配焊缝裂纹高温断裂力学参量的估算

英文题名：Estimation of High-temperature Fracture Mechanics Parameter for Cracks in Mismatched Weldment

作者：轩福贞[1];涂善东[1];王正东[1];巩建鸣[2]

机构：[1]华东理工大学机械工程学院;[2]南京工业大学机械与动力工程学院

年份：2003

卷号：31

期号：10

起止页码：3

中文期刊名：材料工程

外文期刊名：Journal of Materials Engineering

收录：CSTPCD;;EI(收录号：2003517790344);Scopus;北大核心:【北大核心2000】；CSCD:【CSCD2011_2012】；

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 )

语种：中文

中文关键词：蠕变裂纹;高温断裂力学参量;非均质焊缝

外文关键词：creep crack; high-temperature fracture mechanics parameter; mismatched weldment

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 nonhomogeneity of weld, base and heat affected zone and geometry of the weldment and its constituents and the location of preexisting 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 lowmismatch and overmismatch 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