期刊
INTERNATIONAL JOURNAL OF FATIGUE
卷 139, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2020.105720
关键词
Tensile and torsional fatigue; Crack initiation driven force; Very high cycle fatigue; Short crack propagation; FIB
资金
- National Natural Science Foundation of China [11832007, 11802042, 11672196]
Very high cycle tensile and torsional fatigue of TC17 titanium alloy with bimodal microstructure have been firstly and comparatively studied at the stress ratio of 0.1. Like the tensile cracks, torsional cracks were substantiated to nucleate from specimen surface or interior sites and presented in a fatigue life-dependent mode. Internal tensile and torsional fatigue cracks with faceted morphology were analyzed using focus ion beam and unraveled to initiate in modes II + III that driven by maximum shear stress. Particularly, short crack branching and deflection beneath the crack initiation rough area can be observed for torsional loading condition.
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