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Numerical analysis of the blast-resistant mechanisms of multilayered thin plates under close-range air blast load
Pages: 821-833
Year: Issue:  7
Journal: Journal of Ship Mechanics

Keyword:  explosion mechanicsclose-range air blast loadmultilayered thin plateblast-resistant mechanismnumerical analysis;
Abstract: To explore the blast-resistant mechanisms of large-scale multilayered thin plates subjected to close-range explosions of warheads, finite element simulations as well as model tests were carried out. Blast loads, deformation processes, strain distributions and deformation energy absorptions of the clamped multi-layered square plates under close-range air blast loads were numerically analyzed. Comparisons between mul-tilayered plates and single-layer plates of the same materials and equal total thicknesses were conducted. On the basis of the numerical analysises, further investigations into the influences of interlayer spaces, lay-er numbers and boundary conditions on the blast resistances of multilayered plates were performed. The results show that under model test conditions, multilayered plates absorb more deformation energy than their monolithic counterparts, whereas their maximum strains are smaller, and strain distributions are more uniformly than those of the monolithic counterparts. Under ultimate strain conditions, a significant enhance-ment in deformation energy absorptions is obtained for multilayered plates comparing with their monolithic counterparts. Appropriate increase of interlayer spaces leads to a certain extent enhancement in deforma-tion capabilities for multilayered plates, while overlarge interlayer spaces are unfavourable to their overall harmonious deformations. Deformation capabilities of multilayered plates are improved by increasing layer numbers. Comparing with clamped boundary conditions, simple-support boundary conditions are more con-ductive to the adequate exertion of deformation-energy-absorbing capabilities for multilayered plates.
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