EXPERIMENTALLY INVESTIGATING DYNAMIC DEFORMATIONAL AND STRENGTH PROPERTIES OF WOVEN GRID PACKAGES

Abstract

Deformational and strength properties of structurally orthotropic packages of woven metallic grids under static and dynamic loading are experimentally investigated. To apply impact tension in the plane of the layers, an analogue of Nicholas scheme, a modification of Kolsky method, was used. The split Hopkinson bars used feature longitudinal grooves in which a tested specimen is placed and secured. Impact tension is applied with a tensile wave formed in the bars as a result of the reflection of the primary compression wave from the free end of the striker, which (the wave) passes across the interface between the bars without deforming the specimen. It is found that curves of tension in the plane of the layers and curves of compression normal to the layers have a linear character for all loading regimes, and deformation of grid packages reveals plastic properties. Quasi-static tension behavior of grid packages is substantially affected by their presetting. In dynamic tension, this effect is considerably less pronounced.

Keywords: woven metallic grid, experiment, Hopkinson split bar, dynamic deformation, strength, grid package.