PSI - Issue 14

Kartikeya et al. / Procedia Structural Integrity 14 (2019) 514–520 Kartikeya/ Structural Integrity Procedia 00 (2018) 000 – 000

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4. Conclusion

Finite element model of armor steel plates loaded in air-blast was created and tested against experimental results of the literature. Maximum central deflection and plastic strain at the end of simulation were considered as critical parameters for comparison with the experiments. Mesh convergence parametric study was also performed for determination of mesh size where values of critical parameters seem to converge. Results of numerical simulation were found to be acceptable given the ease and time saving benefit of CONWEP with respect to other methods. Layered plates were also tested in the same model. Blast resistance of layered configuration was less than monolithic plates. Also, as the size of constituent plates was decreased, plastic deformation of configuration increased. It can be concluded that layering is not beneficial in case of isotropic metals. However, laminated plates performed better in bending with the increasing number of layers with thickness being constant thus; laminated steel plates of varying thicknesses were tested in the same numerical model. It was determined that lamination of steel plate can help performance of the armor under blast. References Abaqus, 2017. Simulia, Providence, RI . Almohandes, A., Abdel-Kader, M., Eleiche, A., 1996. Experimental investigation of the ballistic resistance of steel-fiberglass reinforced polyester laminated plates. Composites Part B: Engineering 27, 447-458. Børvik, T., Hopperstad, O., Langseth, M., Malo, K., 2003. Effect of target thickness in blunt projectile penetration of Weldox 460 E steel plates. International Journal of Impact Engineering 28, 413-464. Børvik, T., Hanssen, A., Langseth, M., Olovsson, L., 2009. Response of structures to planar blast loads – A finite element engineering approach. Computers & Structures 87, 507-520. Headquarters, U.S. Department of the Army, 1990. Department of the Army Technical Manual – Military Explosives. Jacob, N., Nurick, G., Langdon, G., 2007. The effect of stand-off distance on the failure of fully clamped circular mild steel plates subjected to blast loads. Engineering Structures 29, 2723-2736. Johnson, G., Cook, W., 1985. Fracture characteristics of three metals subjected to various strains, strain rates, temperatures and pressures. Engineering Fracture Mechanics 21, 31-48. Kinney, G., Graham, K., 2014. Explosive Shocks in Air. Springer Berlin, Berlin. Langdon, G., Lee, W., Louca, L., 2015. The influence of material type on the response of plates to air-blast loading. International Journal of Impact Engineering 78, 150-160. Mehreganian, N., Fallah, A.S., Boiger, G.K.,Louca, L.A., 2017. Response of Armour Steel Plates to localised Air Blast Load – A Dimensional Analysis. The International Journal of Multiphysics 11. Mehreganian, N., Louca, L., Langdon, G., Curry, R., Abdul-Karim, N., 2018. The response of mild steel and armour steel plates to localised air blast loading-comparison of numerical modelling techniques. International Journal of Impact Engineering 115, 81-93. Olson, M., Nurick, G., Fagnan, J., 1993. Deformation and rupture of blast loaded square plates — predictions and experiments. International Journal of Impact Engineering 13, 279-291. Palta, E., Gutowski, M., Fang, H., 2018. A numerical study of steel and hybrid armor plates under ballistic impacts. International Journal of Solids and Structures 136-137, 279-294. SSAB, 2017. Armox 440T blast protection plate.