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- Title
Fatigue behavior and mechanism of dog‐bone‐shaped specimens of FV520B‐I in a very high cycle regime.
- Authors
Zhang, Ming; Zhang, Han; Li, Mengli; Liu, Long; Wang, Pengfei
- Abstract
The fatigue properties of dog‐bone‐shaped specimens of FV520B‐I base metal and the welded joint up to 109 cycles were obtained. The S–N curves of the dog‐bone‐shaped specimens were lower than that of the funnel‐shaped specimens, and the S–N curves of welded joint specimens moved downward compared with that of base metal specimens. For all types of specimens, cracks initiating from the surface matrix and cracks initiating from subsurface inclusions were the main cracking modes in the high cycle regime and the very high cycle regime, respectively. The Murakami model and the modified model were used to predict the fatigue strength at 109 cycles. The parameter D* = NG / Ns was used to characterize the competition of different cracking modes, and the expression of the critical radius rc was obtained. Combined with the Gumbel distribution curve of the inclusion size, the probabilities of subsurface cracking and surface cracking were obtained. Highlights: The VHCF properties of dog‐bone‐shaped specimens of FV520B‐I were tested.The effects of specimen shape and welding on the VHCF behaviors and mechanisms were analyzed.The VHCF strength was predicted by Murakami model and the modified model.The parameter D* = NG / Ns was used to characterize the competition of different cracking modes.
- Subjects
FATIGUE limit; WELDED joints; SURFACE cracks; HIGH cycle fatigue
- Publication
Fatigue & Fracture of Engineering Materials & Structures, 2022, Vol 45, Issue 12, p3658
- ISSN
8756-758X
- Publication type
Article
- DOI
10.1111/ffe.13838