文献类型：期刊文献

英文题名：Effects of creep ductility and notch constraint on creep fracture behavior in notched bar specimens

作者：Xu, X.[1];Wang, G. Z.[1];Xuan, F. Z.[1];Tu, S. T.[1]

机构：[1]E China Univ Sci & Technol, Minist Educ, Key Lab Pressure Syst & Safety, Shanghai 200237, Peoples R China

年份：2016

卷号：33

期号：2

起止页码：198

外文期刊名：MATERIALS AT HIGH TEMPERATURES

收录：;EI(收录号：20162102406373);WOS:【SCI-EXPANDED(收录号:WOS:000375870000010)】；

基金：This work was financially supported by the Projects of the National Natural Science Foundation of China [51375165, 51575184, 51325504].

语种：英文

外文关键词：Creep fracture; Creep ductility; Constraint; Notched bar specimen; Notch acuity

摘要：The creep rupture life of U-type notched specimens and smooth specimens has been calculated based on the ductility exhaustion damage model using stress-dependent creep ductility. Effects of creep ductility and notch constraint on creep fracture behaviour in notched bar specimens have been investigated. The results show that the U-type notch exhibits notch strengthening effect under a wide range of stress level and notch constraint condition (notch acuity) for creep ductile materials. The lower equivalent stress in notched specimens plays main role for reducing creep damage and increasing rupture life. The rupture life of notched specimens of creep brittle materials (with lower creep ductility) decreases with the increase in stress level and notch constraint. With increasing creep ductility and decreasing notch constraint, the degree of the notch strengthening effect increases. In creep life designs and assessments of high-temperature components containing notches, the material creep ductility, notch constraint and stress levels need to be fully considered.