A continuous Masing approach for a physically motivated formulation of temperature and strain-rate dependent plasticity

作者：Mayer T^*; Mazza E; Holdsworth S R

来源：International Journal of Pressure Vessels and Piping, 2013, 102: 1-12.

DOI：10.1016/j.ijpvp.2012.11.001

• Yield
• Constitutive laws
• Elastic-plastic
• Analytic
• Flow-rule
• Plasticity
• Residual stress
• Stress-strain
• Distributed element model
• Temperature dependent
• Strain-rate dependent

This study proposes a physically motivated continuous Masing-type model able to accurately describe the temperature and strain-rate dependent elastic-plastic behaviour of a low alloy steel. A modified Cauchy formulation for the element yield strain distribution function is presented that describes a continuous elastic-plastic transition on the basis of four physically interpretable and easily determinable parameters. The performance of the model is compared to conventional strain-hardening models as well as to monotonic and loading-unloading experiments. Furthermore, the description of monotonic temperature and strain-rate dependent constitutive behaviour of a bainitic 2CrMoNiWV steam turbine rotor steel is evaluated on the basis of experimental data. The proposed model represents very well the elastic-plastic constitutive behaviour of 2CrMoNiWV and allows for an adequate extrapolation from a restricted experimentally covered regime. It is believed to form a promising basis for the development of plasticity model formulations.

• 出版日期2013-3