Journal of the Society of Naval Architects of Korea (대한조선학회논문집)

The Society of Naval Architects of Korea (대한조선학회)
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Experimental and Theoretical Investigations on the Fracture Criteria for Structural Steels

구조물용 강재의 파단기준에 대한 실험 및 이론 연구

  • Choung, Joon-Mo (Offshore Basic Design & Engineering Dep't, Hyundai Heavy Industries Co., LTD) ;
  • Cho, Sang-Rai (Dep't of Naval Architecture and Ocean Engineering, University of Ulsan)
  • 정준모 (현대중공업 해양기본설계부) ;
  • 조상래 (울산대학교 조선및해양공학과)
  • Published : 2008.04.20
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Abstract

Six smooth flat tensile specimens and eighteen punch specimens with three different thicknesses were machined from steel of JIS G3131 SPHC. In addition to punch tests, incremental tensile tests were conducted to obtain average true flow stress - logarithmic true strain curves. Through parametric FE simulations for the tensile specimens, material parameters related to GTN model were identified. Using indenters with three kinds of radius, punch tests were carried out to obtain fracture characteristics of punch specimens. Numerical analyses using both fracture models, GTN and $J_2$ plasticity model, gave that the former estimated well the fracture of punch specimen but the latter did not. A new concept for critical size of plate elements was introduced based on minimum relative sharpness between contact structures. Consequently, a new criterion for critical element size was proposed to be less than 20% of minimum relative radius of interacting structures.

Keywords

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  2. Ductile fracture prediction of high tensile steel EH36 using new damage functions vol.13, pp.sup1, 2018, https://doi.org/10.1080/17445302.2018.1426433