文献类型：期刊文献

英文题名：Notch Behavior of Components Under the Stress-Controlled Creep-Fatigue Condition: Weakening or Strengthening?

作者：Gong, Jian-Guo[1];Xuan, Fu-Zhen[1]

机构：[1]East China Univ Sci & Technol, Sch Mech & Power Engn, 130 Meilong Rd, Shanghai 200237, Peoples R China

年份：2017

卷号：139

期号：1

外文期刊名：JOURNAL OF PRESSURE VESSEL TECHNOLOGY-TRANSACTIONS OF THE ASME

收录：;EI(收录号：20163402732052);WOS:【SCI-EXPANDED(收录号:WOS:000391720600012)】；

基金：The support from the National Science Foundation of China (Grant Nos. 51325504 and 51475167) and the China Postdoctoral Science Foundation (Grant No. 2015M581548) are greatly acknowledged.

语种：英文

外文关键词：notch behavior; creep-fatigue interaction; finite-element analysis

摘要：Notch-related weakening and strengthening behavior under creep-fatigue conditions was studied in terms of the elastic-viscoplasticity finite-element method (FEM). A coupled damage analysis, i.e., the skeletal point method for creep damage evaluation coupled with the equivalent strain range method for fatigue damage, was employed in the notch effect evaluation. The results revealed that, under the short holding time condition, a weakening behavior was observed for the notch, while a strengthening effect was detected with the increase of holding time. The difference could be ascribed to the creep damage contribution in the holding stage. The influence of stress concentration factor (SCF), stress ratio, and the maximum stress was strongly dependent on the competition of creep and fatigue mechanism.