Journal
ENGINEERING FRACTURE MECHANICS
Volume 259, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.engfracmech.2021.108136
Keywords
TC17 titanium alloy; Surface defect; Very high cycle fatigue; Crack initiation; Fatigue strength prediction
Categories
Funding
- National Natural Science Foundation of China [91860112]
- National Natural Science Foundation of China Basic Science Center for Multiscale Problems in Nonlinear Mechanics [11988102]
- Science and Technology Research and Development Program of China State Railway Group Co., Ltd. [P2020J024]
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The fatigue strength of TC17 titanium alloy with surface defects is greatly influenced by the size of the defects. When the defect size exceeds a critical value, cracks initiate from the defects, and the fatigue strength can be expressed mathematically. The model has also been validated by experimental results of metallic materials in literature.
S-N data of TC17 titanium alloy with surface defects exhibits plateau region (105-109 cycles) feature. The effects of defects are greatly related to the defect size. When the defect size is bigger than the critical one, the crack initiates from the defect, and the fatigue strength sigma w incorporating the effects of defects could be expressed as sigma w = C(root of the projection area of defect perpendicular to the principal stress direction, C and n are parameters. The model is also validated by the experimental results of metallic materials in literature.
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