Steel and Composite Structures

  • 제44권4호
  • /
  • Pages.587-602
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  • 2022
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  • 1229-9367(pISSN)
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  • 1598-6233(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

A numerical framework of the phenomenological plasticity and fracture model for structural steels under monotonic loading

  • He, Qun (Department of Building and Real Estate, The Hong Kong Polytechnic University) ;
  • Yam, Michael C.H. (Department of Building and Real Estate, The Hong Kong Polytechnic University) ;
  • Xie, Zhiyang (State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University) ;
  • Lin, Xue-Mei (Department of Building and Real Estate, The Hong Kong Polytechnic University) ;
  • Chung, Kwok-Fai (Chinese National Engineering Research Centre for Steel Construction (Hong Kong Branch), The Hong Kong Polytechnic University)
  • 투고 : 2021.09.12
  • 심사 : 2022.08.22
  • 발행 : 2022.08.25
⟨ 이전 논문 다음 논문 ⟩

초록

In this study, the classical J2 flow theory is explicitly proved to be inappropriate to describe the plastic behaviour of structural steels under different stress states according to the reported test results. A numerical framework of the characterization of the strain hardening and ductile fracture initiation involving the effect of stress states, i.e., stress triaxiality and Lode angle parameter, is proposed based on the mechanical response of structural steels under monotonic loading. Both effects on strain hardening are determined by correction functions, which are implemented as different modules in the numerical framework. Thus, other users can easily modify them according to their test results. Besides, the ductile fracture initiation is determined by a fracture locus in the space of stress triaxiality, Lode angle parameter, and fracture strain. The numerical implementation of the proposed model and the corresponding code are provided in this paper, which are also available on GitHub. The validity of the numerical procedure is examined through single element tests and the accuracy of the proposed model is verified by existing test results.

키워드

과제정보

The work described in this paper is fully supported by a grant from the Chinese National Engineering Research Centre (CNERC) for Steel Construction (Hong Kong Branch) at The Hong Kong Polytechnic University (Project No. 1-BBV4).

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