Mechanical Behavior of a Structural Steel at Different Rates of Loading

Estimating the Strain-Rate-Dependent Parameters of the Cowper-Symonds and Johnson-Cook Material Models using Taguchi Arrays

“…The average values from the three best solutions are listed in Table 5. We can conclude from Table 5 that our estimations of the parameters E t , P, C and B, n, c are comparable to the values reported for mild steels in the literature ( [9] to [11]), despite different experimental arrangements and the fact that the strain rates during the experiments were 10 or more times higher in our case. We can conclude that we obtained reasonable estimates of the parameters E t , P, C and B, n, c for our case.…”

“…The presented approach was applied to the realistic case of a material-parameter estimation for two different material models, i.e., the C-S and the J-C material models. [9] 0.779-2.692 0.743-0.928 0.0144-0.021 -Marais et al [10] 0.292 0.310 0.025 -It turned out that it is possible to obtain reliable estimates of the C-S parameters (E t , P, C) and J-C parameters (B, n, c) with a nested design-of-simulation approach using only two iteration runs. The materialparameter estimates for the two models are consistent and comparable to the results from the literature.…”

“…The three most commonly applied material models in researches [9] to [15] that consider the strain-rate effects are: Cowper-Symonds, Johnson-Cook, and Zerilli-Armstrong. Since the Cowper-Symonds and Johnson-Cook material models are simpler than the Zerilli-Armstrong material model, we considered only the former two models in our research.…”

“…The main problem, linked to the material parameters that consider the strain-rate effects, is that they cannot be simply measured and determined, thus they are empirically determined through special experimental and optimisation processes ( [9] to [13]). For the above-mentioned material models the parameters that consider the strain-rate dependence were investigated for many different materials.…”

“…For the above-mentioned material models the parameters that consider the strain-rate dependence were investigated for many different materials. In the literature, their typical values for mild steel ( [9], [10] and [11]), high-yield-strength steel [12], aluminium alloys [13], titanium alloys [13], etc. can be found.…”