文献类型：期刊文献

中文题名：蠕变局部损伤理论在裂纹扩展研究中的应用

英文题名：Prediction of Creep Crack Incubation Time and Propagation by Local Damage Approach

作者：汤晓英[1];周斌生[1];王正东[1];吴东棣[1]

机构：[1]华东理工大学机械工程学院,上海200237

年份：2001

卷号：25

期号：6

起止页码：12

中文期刊名：机械工程材料

外文期刊名：Materials For Mechanical Engineering

收录：CSTPCD;;北大核心:【北大核心2000】；CSCD:【CSCD2011_2012】；

语种：中文

中文关键词：局部损伤;孕育时间;蠕变裂纹扩展率;局部断裂延性

外文关键词：local damage; incubation time; creep crack growth rate (CCGR); fracture ductility

摘要：根据局部损伤理论和相似原理 ,给出了蠕变裂纹启裂前的孕育上下限时间并推导了蠕变裂纹扩展率方程。在常载荷下用 2 .2 5Cr 1Mo钢作了蠕变裂纹扩展试验 ,高拘束度使早期局部损失发展迅速 ,试验结果与孕育时间下限接近。
Based on the local damage hypothesis and utilizing similarity solutions, this paper presents a procedure for estimating the incubation time prior to the onset of creep crack growth. A theroretical equation for the calculation of creep crack growth rate (CCGR) has also been derived. Tests under constant load have been carried out in 2.25Cr 1Mo steel. It has been shown that the experimental time is close to the lower limit because of high constraint. Ignoring of uncracked ligament deterioration makes prediction of CCGR slightly lower than experimental data.