Abstract
Multilayered packages of metallic woven grids are used for protecting the vessels of explosion chambers and other structures from fragmentation damage and pulsed effects. A grid package is basically formed by stacking up several layers, observing the direction of the wires; that is why such a package can be considered to be a highly-porous deformable structural element with orthotropic properties. Earlier experimental studies made it possible to construct deformation curves for porous packages of woven grids under dynamic and static compression normal to the layer. To find out factors causing differences in dynamic and static deformation curves, normal compression of a symmetric fragment of woven grids under dynamic and static loading modes observed in the experimental studies was numerically modeled. The 3D processes of elastoplastic deformation of a fragment of a woven metallic grid, accounting for contact interaction between the wires, were numerically modeled with the help of computational systems ANSYS and ANSYS LS-DYNA using FEM. The analyzed area consisted of four 3D cylindrical bodies. Compression was applied with a pair of ideally rigid plates, symmetrically approaching each other. The deformational behavior of the wires was described using the model of plasticity with isotropic hardening. To obtain reliable computational results, a static deformation diagram was constructed for the steel the grid was made of. The effect of time limitation of the loading pulse was studied, as well as the effect of the difference in the static and dynamic deformation diagrams of the material of the grid. It is shown that the main effect on the dynamic behavior of the fragment of a porous package of steel grids is caused by the dynamic properties of the wire material, i.e., by the difference between the dynamic and static deformation diagrams. The final duration of the loading pulse and friction between the wires do not have any significant influence for that type of grids.
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