Johnson cook modelGlobal response surface algorithmThis study investigates the mechanical properties of Q235B steel through quasi-static tests at both room temperature and elevated temperature. The initial values of the Johnson-Cook model parameters are determined using a fitting method. The global ...
Johnson–Cook strength modelJohnson〤ook (JC) high temperature strength material models have been widely used in Finite Element Analysis (FEA) to solve variety of hot rolling problems. In this paper, the temperature and strain rate related parameters of JC model were experimentally calibrated for ...
This is accounted for by the VPJC material model in the EPX code [18], which uses a generalized form of Hooke's law for the elastic behaviour and a modified Johnson-Cook relation for the flow stress [27]. The dynamic yield function fd is then given by (3)fd(σ,p,p˙,T)=σeq(...
Consistent and reasonable characterization of the material behavior under the coupled effects of strain, strain rate and temperature on the material flow stress is remarkably crucial in order to design as well as optimize the process parameters in the metal forming industrial practice. The objective of...
The parameter space involved two sets of Johnson-Cook model parameters for RHA, two sets of Johnson-Cook parameters for the tungsten rod material, four tungsten rod length-to-diameter (L/D) ratios, and two continuum mechanics codes. Striking velocities considered in the study ranged from ...
In literature, five different sets of work material constants used in the Johnson–Cook's (J–C) constitutive equation are implemented in a numerical model to describe the behaviour of AISI 316L steel. The aim of this research is to study the effects of five different sets of material constan...
The Holmquist-Johnson-Cook (HJC) model is widely used in the simulation of the conventional concrete subjected to impact and explosion, whereas there are rare studies on calibrating the parameters of the HJC model for UHPC. In this study, a set of HJC model parameters for UHPC with ...
The investigation on Johnson-Cook model and dynamic mechanical behaviors of ultra-high strength steel M54 2022, Materials Science and Engineering: A Citation Excerpt : In recent decades, ultra-high strength steels, such as Aermet100 steel and Ferrium S53 steel have attracted much attention in aero...
Based on the experimental data, the Johnson–Cook (JC) constitutive model was established and modified. By incorporating the coupling effects of strain, strain rate, and temperature, a more accurate constitutive equation was proposed. The results show that the modified JC model provides better ...
To define the thermoviscoplastic behaviour of the material constituting the plate, the Johnson–Cook model has been used. This homogeneous behaviour has been coupled with the Johnson–Cook fracture criterion to predict completely the perforation process. The simulations cover a range of impact ...