| 摘要(英) |
In this study, the implicit solver of ANSYS Mechanical and the explicit solver of LS-DYNA were used to perform quasi-static tensile tests. Two material models, Bi-linear (BISO) and Multi-linear (MISO) stress-strain curves, were employed to simulate the mechanical behavior beyond the yield point. Finally, the pros and cons of both methods were compared to each other based on the validation of simulation against experimental data and computational efficiency.
First of all, the MTS810 was used to perform tensile tests on hot-dip galvanized steel (SGCC) specimens, and the engineering measurement was converted into the true stress-strain to obtain their mechanical properties. Subsequently, a finite element model was established using ANSYS. In order to reduce simulation errors and improve analysis accuracy, the parameters (integration settings, element shapes, and hourglass control) and convergence analysis were performed to select suitable parameters and meshes for this experiment. Finally, two material models were established based on the stress-strain curves obtained from the experiment. They were respectively incorporated into the finite element model with boundary conditions for tensile simulations.
The results of simulations around the ultimate tensile strength indicate that the implicit solver with the BISO model obtained a stress error of 1.017%, while the explicit solver with the BISO model obtained a stress error of 1.070%. Both results were close to the experimental data. Additionally, the implicit solver with the MISO model was used to achieve a stress error of only 0.334% which provides even more accurate analysis. The simulation results of the two solvers demonstrate that both implicit and explicit solvers are suitable for the quasi-static tensile test. The implicit algorithm offers fast solving speed and high CAE accuracy. In contrast, the explicit solver allows for individual settings for the model also stabilizes the calculation process and reduces simulation errors, especially for complex models or different loading conditions. |
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