Laminated Composite Sandwich Plates with a Weak Compressible Core Impacted by Blast Loading
ARMY TANK AUTOMOTIVE RESEARCH DEVELOPMENT AND ENGINEERING CENTER WARREN MI
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The governing theory of asymmetric sandwich plates with a first-order compressible core impacted by a Friedlander-type of blast has been presented and simplified for the case of symmetric cross-ply and single-layered orthotropic facings. In all cases, it was mentioned that all four edges are simply supported and freely movable. Results were then presented for this simplified case and validated against results found in the literature from R. S. Alwar et al. It was found that for the incompressible core case that there was close agreement among the results. In regards to the compressible core case, no appropriate results have been found in the literature for the theory presented in this paper for the simply supported case with all edges freely movable. The effect of a number of important geometrical and material parameters were analyzed with conclusions drawn. Some of the important conclusions were that wrinkling response seems to be diminished as the young s modulus of the core is increased. The same is the case for larger rates of decay. Also, for thicker cores, both the global and wrinkling responses are less severe. It was also revealed that the compressibility of the core has only a marginal effect upon the global response of the sandwich plate. Finally, the cross-ply type layup when compared with single-layered facings seemed to have a large effect on the global response and less effect on the wrinkling response. One should keep in mind that both the stress and strain profiles should be determined to determine possible failure of the structure.
- Laminates and Composite Materials