Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Strain-rate and stress-state dependent ductile fracture model of S690 high-strength steel
Abstract The stress-state and strain-rate dependent ductile fracture initiation property of S690 high-strength steel is investigated in this study through experiments and simulations. A total of 14 specimens, including uniaxial tension, notched tension, central hole, plane strain, and in-plane pure shear specimens, are tested in the experimental programme. The Cowper–Symonds-type rate correction term is considered in the yield function and the three-dimensional ductile fracture initiation locus. Linear and non-linear damage accumulation evolution laws are discussed for specimens under various degrees of non-proportional loading. The extended model with the damage evolution is implemented in a user-defined material subroutine, VUMAT, and applied to the numerical simulations. A hybrid experimental and numerical approach is adopted to calibrate the key parameters. Then, a stress-state and strain-rate dependent ductile fracture model of S690 high-strength steel is proposed and validated in this study.
Highlights The influences of stress state and strain rate on fracture initiation are studied with S690 steel. A strain rate dependent term is proposed based on the quasi-static Hosford–Coulomb fracture model. Linear and nonlinear damage accumulation laws are compared when the stress state changes greatly.
Strain-rate and stress-state dependent ductile fracture model of S690 high-strength steel
Abstract The stress-state and strain-rate dependent ductile fracture initiation property of S690 high-strength steel is investigated in this study through experiments and simulations. A total of 14 specimens, including uniaxial tension, notched tension, central hole, plane strain, and in-plane pure shear specimens, are tested in the experimental programme. The Cowper–Symonds-type rate correction term is considered in the yield function and the three-dimensional ductile fracture initiation locus. Linear and non-linear damage accumulation evolution laws are discussed for specimens under various degrees of non-proportional loading. The extended model with the damage evolution is implemented in a user-defined material subroutine, VUMAT, and applied to the numerical simulations. A hybrid experimental and numerical approach is adopted to calibrate the key parameters. Then, a stress-state and strain-rate dependent ductile fracture model of S690 high-strength steel is proposed and validated in this study.
Highlights The influences of stress state and strain rate on fracture initiation are studied with S690 steel. A strain rate dependent term is proposed based on the quasi-static Hosford–Coulomb fracture model. Linear and nonlinear damage accumulation laws are compared when the stress state changes greatly.
Strain-rate and stress-state dependent ductile fracture model of S690 high-strength steel
Shang, Mingxu (Autor:in) / Yang, Hua (Autor:in) / Su, Andi (Autor:in) / Wang, Yuyin (Autor:in)
06.02.2023
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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