期刊
INTERNATIONAL JOURNAL OF FATIGUE
卷 136, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2020.105597
关键词
Welded joint; Specimen design; High cycle fatigue; Dynamic strain aging; Mismatched deformation
资金
- National Natural Science Foundation of China [51575182, 51835003, 51922041]
Axially push-pull fatigue tests of a low-strength Cr-Ni-Mo-V steel welded joint using cross-weld specimens with two types of sampling, i.e., weld metal centered and heat-affected zone centered, were conducted up to 5 x 10(7) cycles at room temperature and 300 degrees C. Fatigue strength of heat-affected zone centered specimen was higher due to dynamic strain aging at weld metal at 300 degrees C and a locally mismatched deformation around heat-affected zone. The failure location varied as a result of mismatched deformation, structural soft zone, and micro-defects. The sampling dependence implied for a proper fatigue design and assessment of welded structures.
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