Numerical and Experimental Investigation of Structural Integrity in Armored Vehicle Due to Explosive Loading

Authors

1 Mech. Eng. Sch., Iran Univ. of Sci. & Tech., Tehran, Iran

2 Dep. of Aero. and Mech. Eng., Science and Research Branch, Islamic Azad university, Tehran, Iran

3 Arak University of Technology

Abstract

Armored vehicles almost experience explosive loading in battle field. In this article, the structural integrity of armored vehicle under explosive loading will be studied experimentally and numerically. A finite element method has been developed to find the effect of explosion by 10 kg TNT at 97 cm distance from bottom of armored vehicle on the structure of vehicle. After determination of stress and strain distribution induced in the structure, part of the vehicle, which has maximum stress, is selected for detail analysis. The selected part consists of welding joints. The selected structure is modeled in the finite element software and an equivalent explosive loading was applied to the structure. The equivalent explosive loading on selected welded structure is so that same loading condition was applied to the structure as the real condition. The equivalent explosive welding is carried out by 500 gr TNT at 12.5cm distance. Experimental tests had been implemented on the selected structure by the equivalent explosive loading. A particular fixture was designed and manufactured for experimental tests. The finite element results show that the stress magnitude in the welded structure exceeds from the yield strength of the used material, the structure experiences plastic deformation. But fracture did not happen in the structure. Similar conditions have been observed in the experimental results. The explosion steps which was recorded by a high-speed camera shows that the blast wave is similar to the results of smoothed particle hydrodynamics (SPH).

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References

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Journal of Solid and Fluid Mechanics
Volume 8, Issue 3
October 2018
Pages 193-204

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