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Publications
Patel, MD., Patel, SD., Ahmad, SH., Guedes Soares, C. and Arora, P. (2025), Dynamic response estimation of constant mass steel plates with different exposed area configurations under air blast loads, 44th International Conference on Ocean, Offshore and Arctic Engineering (OMAE2025), 22-27 June, Vancouver, British Columbia, Canada, Paper No: OMAE2025-157320, V001T02A034.
The aim of the present numerical study is to investigate the dynamic behavior of the same mass, same areal density, and equal exposed area high-strength AL-6XN steel plates with different exposed area configurations subjected to convention weapons effects program (CONWEP) air blast loads. The selected exposed area configurations, such as square, circular, hexagonal, and octagonal for the equal massed plate structures, are mirror symmetric. However, only their quarter parts (mass = 9 kg) were designed for numerical analysis to minimize the computational costs. The air blast loads of 1-3 kilograms of spherical trinitrotoluene (TNT) were applied for a 125 mm constant stand-off distance (SoD). The rate-dependent material model of Johnson-Cook (J-C) was used for accurate prediction of plastic deformation in the plates. The time-dependent deflection of the center of the plates with various exposed area configurations was considered key parameters for the present work to define their blast mitigation performance. The timedependent deformation, kinetic energy, and internal energy response were also recorded to characterize their blast resistance. Permanent deformation of the plates, their equivalent plastic strain behavior, and their plastic dissipation energy (PDE) were also compared. The findings of the study represented that the octagonal exposed area plates (OEAPs) have the highest deflection resistance, highest deformation resistance, smallest plastic deformation, smallest PDE, and smallest internal and kinetic energies, followed by those of hexagonal exposed area plates (HEAPs), circular exposed area plates (CEAPs), and square exposed area plates (SEAPs). However, to design a huge
protective structure such as naval ships and military vehicles, the joined small protective plates or windows having octagonal exposed area will provide the highest protection against blast attacks.
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