文献类型：期刊文献

英文题名：A DAMAGE MECHANICS APPROACH TO THE PREDICTION OF CREEP CRACK-GROWTH

作者：WANG, ZD; WU, DD

年份：1991

卷号：48

期号：3

起止页码：305

外文期刊名：INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING

收录：;WOS:【SCI-EXPANDED(收录号:WOS:A1991GR03300004)】；

语种：英文

摘要：Based upon the local damage hypothesis and utilizing similarity solutions, a theoretical equation for the calculation of creep crack growth rate has been derived in this paper. Creep crack growth tests under constant load and constant load-pin-displacement-rate have been carried out at 550-degrees-C and 565-degrees-C in a 2.25Cr-1Mo steel. It has been shown that the prediction of creep crack growth rate using the local damage model would be on the safe side, as the prediction line ties in with the upper limit of the experimental data. In this paper, the validity of the C* parameter in the case of a small damage zone has been examined and confirmed. An empirical formula for the evaluation of the 'creep constraint factor' has been established to meet the needs of calculation of creep crack growth using the local damage model.