A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Cyclic constitutive model and fracture criterion of low yield point steel
Abstract The low yield point (LYP) steel components for energy dissipation generally experiences substantial plastic deformation at triaxial stress states before fracture failure. This paper presents experimental and theoretical studies on the ultra-low cyclic fatigue performance of LYP at triaxial stress states. The monotonic mechanical properties of LYP steel under triaxial stress states are established through 14 tensile tests on four types of specimens with different initial geometries. Subsequently, 10 ultra-low cyclic tests are conducted to investigate the ultra-low cycle fatigue behavior of LYP steel at various triaxial stress states. An optimization-based technique is employed to calibrate the constitutive model for LYP steel, incorporating both isotropic and kinematic hardening performances. A phase-field framework is established and used for fracture prediction of LYP steel loading at triaxial stress states. In this proposed framework, the critical fracture density representing the fracture toughness in phase-field theory is taken as a variable related to equivalent plastic strain and stress states rather than a constant to describe the variation of fracture ductility of material under cyclic loading. The calibrated constitutive model and proposed fracture prediction framework are both implemented in finite element model and validated by simulating experimental results.
Highlights Monotonic and cyclic tests on specimens with various geometries were conducted. A combination hardening constitutive model of LYP225 was established by an optimization algorithm. A phase-field framework for fracture failure prediction of LYP225 was established.
Cyclic constitutive model and fracture criterion of low yield point steel
Abstract The low yield point (LYP) steel components for energy dissipation generally experiences substantial plastic deformation at triaxial stress states before fracture failure. This paper presents experimental and theoretical studies on the ultra-low cyclic fatigue performance of LYP at triaxial stress states. The monotonic mechanical properties of LYP steel under triaxial stress states are established through 14 tensile tests on four types of specimens with different initial geometries. Subsequently, 10 ultra-low cyclic tests are conducted to investigate the ultra-low cycle fatigue behavior of LYP steel at various triaxial stress states. An optimization-based technique is employed to calibrate the constitutive model for LYP steel, incorporating both isotropic and kinematic hardening performances. A phase-field framework is established and used for fracture prediction of LYP steel loading at triaxial stress states. In this proposed framework, the critical fracture density representing the fracture toughness in phase-field theory is taken as a variable related to equivalent plastic strain and stress states rather than a constant to describe the variation of fracture ductility of material under cyclic loading. The calibrated constitutive model and proposed fracture prediction framework are both implemented in finite element model and validated by simulating experimental results.
Highlights Monotonic and cyclic tests on specimens with various geometries were conducted. A combination hardening constitutive model of LYP225 was established by an optimization algorithm. A phase-field framework for fracture failure prediction of LYP225 was established.
Cyclic constitutive model and fracture criterion of low yield point steel
Wang, Yuan-Zuo (author) / Liang, Tian-Yu (author) / Yang, Lu (author)
2024-02-29
Article (Journal)
Electronic Resource
English
Yield-point phenomenon in constitutive models of cyclic plasticity
| British Library Online Contents | 2010
Experimental cyclic behavior and constitutive modeling of low yield point steels
| Online Contents | 2016
Experimental cyclic behavior and constitutive modeling of low yield point steels
| British Library Online Contents | 2017