Numerical study of elastoplastic dynamic compression of metal braided grid

Abstract

Numerical modeling of elastic-plastic compression along the normal of two symmetric fragments of a package of woven steel grid is carried out. The dynamic loading mode was carried out in the ANSYS LS-DYNA computer system. A porous grid stack is formed by overlapping layers while maintaining wire directions. The packet has a quasi-periodic structure and a symmetric fragment can be distinguished. One grid layer and two grid layers were simulated, when the second layer is shifted by half the periodicity cell. Compression was carried out by a pair of absolutely rigid plates moving symmetrically towards each other. The calculations used a plasticity model with isotropic hardening. In the calculation, two diagrams of material deformation were used: dynamic and static, obtained by increasing the yield stress. With an increase in the yield point of the material, the deformation curves of the fragment change qualitatively, as in the experiments. The final duration of the loading pulse and the friction between the wires for this type of grid do not have a significant effect. The material in the dynamic mode has time to irreversibly deform during the action of the loading pulse. A comparison of the results obtained with the experimental curve obtained under dynamic compression is shown.