YE Ji-hong, FAN Zhi-peng. DUCTILE FRACTURE BEHAVIOR OF STEEL UNDER COMPLEXSTRESS STATE BASED ON MICROSCOPIC MECHANISM[J]. Engineering Mechanics, 2021, 38(5): 38-49. DOI: 10.6052/j.issn.1000-4750.2020.06.0394
Citation: YE Ji-hong, FAN Zhi-peng. DUCTILE FRACTURE BEHAVIOR OF STEEL UNDER COMPLEXSTRESS STATE BASED ON MICROSCOPIC MECHANISM[J]. Engineering Mechanics, 2021, 38(5): 38-49. DOI: 10.6052/j.issn.1000-4750.2020.06.0394

DUCTILE FRACTURE BEHAVIOR OF STEEL UNDER COMPLEXSTRESS STATE BASED ON MICROSCOPIC MECHANISM

  • Ductile fracture is the most common form of steel damage. It is of a great theoretical significance and practical value to study the toughness fracture mechanism of steel and to accurately predict the ductile fracture behavior of steel. The fracture prediction method based on microscopic mechanism has good applicability for studying the toughness fracture behavior of steel. The existing ductile fracture model is improved based on the void evolution mechanism of the somatic cell model, and the parameters of the Q345 steel fracture model are verified. In addition, the damage factor is introduced into the ductile fracture model to consider the change of stress state during loading, thusly the fracture model can accurately describe the cumulative damage value at each loading moment. At the end of the article, Fortran language is used to compile the fracture model into USDFLD subroutine, and it is inserted into the finite element program ABAQUS to numerically simulate the uniaxial tensile test of a group of cross-type rigid joint specimens. The results show that the fracture model has good prediction accuracy under the tensile-shear composite stress state, and can accurately capture the steel fracture start position and crack propagation path. The improved ductile fracture model can also be used for the fracture prediction analysis of other ductile metal materials.
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