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Steel and Composite Structures Volume 43, Number 4, May25 2022 (Special Issue) pages 465-481 DOI: https://doi.org/10.12989/scs.2022.43.4.465 |
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A complete integrity assessment of welded connections under high and low cycle fatigue followed by fracture failure |
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Liuyang Feng, Tianyao Liu and Xudong Qian and Cheng Chen
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| Abstract | ||
| This paper presents a comprehensive integrity assessment of welded structural components, including uniform high-and low-cycle fatigue assessment of welded plate joints and fatigue-induced fracture assessment of welded plate joints. This study reports a series of fatigue and fracture tests of welded plate joints under three-point bending. To unify the assessment protocol for high- and low-cycle fatigue of welded plate joints, this study develops a numerical damage assessment framework for both high- and low-cycle fatigue. The calibrated damage material parameters are validated through the smooth coupon specimens. The proposed damage-based fatigue assessment approach describes, with reasonable accuracy, the total fatigue life of welded plate joints under high- and low-cycle fatigue actions. Subsequently, the study performs a tearing assessment on the ductile crack extension of the fatigue-induced crack. The tearing assessment diagram derives from the load-deformation curve of a single-edge notched bend, SE(B) specimen and successfully predicts the load-crack extension relation for the reported welded plate joints during the stable tearing process. | ||
| Key Words | ||
| continuum damage mechanics; fatigue assessment; fracture failure; tearing assessment; welded plate joint | ||
| Address | ||
| Liuyang Feng, Tianyao Liu and Xudong Qian and Cheng Chen: Department of Civil and Environmental Engineering, National University of Singapore, Singapore 117576 | ||