Influence of mesh size,stress triaxiality and damage induced softening on ductile fracture of large-scale shell structures |
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| Institution: | 1. State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China;2. School of Naval Architecture and Ocean Engineering, Jiangsu University of Science and Technology, Zhenjiang, 212003, Jiangsu, China;3. Center for Collision and Grounding of Ships and Offshore Structures (CCGS), Zhenjiang, 212003, Jiangsu, China;1. Department of Integrated Systems Engineering, The Ohio State University, 1971 Neil Avenue, Columbus, OH 43210, USA;2. Department of Mechanical Engineering and CAMMI – Center for Advanced Materials and Manufacturing Innovation, University of New Hampshire, 33 Academic Way, Durham, NH, 03824, USA |
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| Abstract: | In this investigation, ductile fracture in stiffened and unstiffened panels is simulated employing the fracture criterion, which depends on the mesh size, stress state and damage induced softening. The aim of the study is to show that employed fracture criterion removes mesh size effects more efficiently than traditional fracture criteria adjusted only on the basis of uniaxial tension. Fracture model is implemented into Finite Element software ABAQUS using user-defined material, VUMAT-subroutine, available for shell elements. Mesh size sensitivity analysis is carried out. Finite element simulation results are validated with experimental measurements available in literature. Comparison of numerical and experimental results shows that simulations effectively capture most of the experimentally observed features, especially when considering different mesh densities. In most cases, mesh size effects are considerably reduced compared with the fracture criteria adjusted on the basis of a uniaxial tension. |
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| Keywords: | Large structures Ductile fracture Shell elements Fracture criterion Stress triaxiality Size effects Damage softening |
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