期刊
ENGINEERING FRACTURE MECHANICS
卷 144, 期 -, 页码 1-15出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.engfracmech.2015.06.065
关键词
Transition point; Fatigue crack growth; Microstructure; Load ratio; Welded joint
类别
资金
- National Natural Science Foundation of China [51325504, 51205131]
- Natural Science Foundation of Shanghai [12ZR1442900]
- Specialized Research Fund for the Doctoral Program of Higher Education [20120074120010]
Transitional behavior of fatigue crack growth is observed for initial notches located at base metal, weld metal and heat-affected zone of 25Cr2Ni2MoV steel welded joint. Results indicate that both microstructures and load ratio R contribute to the transition. Greater roughness at both weld metal and base metal indicates a more pronounced roughness-induced crack closure in the near-threshold regime than that at heat-affected zone, especially at lower R. This transition is dominated by both Delta K and K-max which depends on R. An estimation of Delta K at transition point is proposed, which agrees fairly well with the experimental data. (C) 2015 Elsevier Ltd. All rights reserved.
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