Numerical and Experimental Study of Damage in Multi-Compartment Armor due to UNDEX

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Khodaeipour B.; Khodarahmi H.; sadeghyazdi M.; Zia shamami M.

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Journal Paper

Paper Information

Journal: Modares Mechanical Engineering Year:2024 | Volume:24 | Issue:8 Page(s): 499-509

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Information Journal Paper

Title

Numerical and Experimental Study of Damage in Multi-Compartment Armor due to UNDEX

Author(s)

Khodaeipour B. | Khodarahmi H. | sadeghyazdi M. | Zia shamami M. | Issue Writer Certificate

Keywords

Multi-compartment structure

Contact UNDEX

Damage characteristics

Numerical parametric study

Energy absorption

Abstract

Multi-compartment structures are a sort of multi-layer armor widely used to protect naval equipment, due to their high resistance to underwater blasts, simple-tech/low-cost production, and repairability. The present article numerically investigates the Contact UNDEX damages of conceptual-construction structures consisting of three metal layers and two mid-compartments. For this purpose, a set of experiments was designed and executed using AUTODYN. The numerical modeling process and outputs were validated with the results of an experimental test. The results showed that all the structures with the same mediums in compartments suffered rupture in their last layer. Structures with air-water mediums did not experience tearing in their last layer if had a St37 midplate. Benefiting from a St37 front plate led to a significant Energy absorption increase of 62%. Also, all structures with water-air mediums had excellent resistance performances and presented a meaningful reduction of 49% in the last layer deflection providing a St37 midplate. Furthermore, the comparison of structural performances showed that the structure consisting of Al2024-T3, St37, and St37 layers respectively, and water-air mediums brings forward the most competitive altogether values for the minimum last layer's central deflection of 11.6 mm and maximum Energy absorption per areal mass equal to 84.6 J.m2/kg.

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