Performance of polymer-steel bi-layers under blast
We present results from our numerical simulation of the dynamic response and deformation of 1m diameter circular DH-36 steel plates and DH-36 steel-polyurea bi-layers, subjected to blast loads. Different thicknesses of polyurea are considered, and the effect of polyurea thickness on the performance of steel plates under blast loads is investigated. For each polyurea thickness, we have simulated three cases: 1) polyurea cast on front face (loading face); 2) polyurea cast on back face; and 3) no polyurea, but an increase in steel-plate thickness such that the areal density remains the same in all three cases. Two types of loading are applied to the polyurea-steel system: (1) Direct application of pressure on the bi-layer system, (2) Application of pressure through a separate medium (polyurethane or water).
For numerical simulations, we employed physics-based and experimentally-supported temperature- and ratesensitive constitutive models for steel and polyurea, including in the latter case, the pressure effects. Results from the simulations reveal that in all cases, polyurea cast on the back face exhibits superior performance relative to the other cases. The differences become more pronounced as polyurea thickness (and the corresponding steel-plate thickness) becomes greater. Also, the differences become less pronounced when direct pressure is applied.
Keywordspolyurea steel plate bi-layer blast
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