期刊
MARINE STRUCTURES
卷 38, 期 -, 页码 1-17出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.marstruc.2014.05.001
关键词
Large structures; Ductile fracture; Shell elements; Fracture criterion; Stress triaxiality; Size effects; Damage softening
资金
- Tekes, STX Finland
- Napa Ltd. in FIMECC Innovations and Networks - research project
- Graduate School of Engineering Mechanics - Finnish Academy of Sciences
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. (C) 2014 Elsevier Ltd. All rights reserved.
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