Abstract
The paper reports a study on the effect of a shock wave generated during the detonation of 1.5 kg TNT on the deformation of a multi-layered energy absorber. The experiments were carried out using a custom- designed testing station. The detonation of the charge was performed using a steel plate with a blind hole in accordance with the requirements of the NATO (North Atlantic Treaty Organization) AEP -55 (Allied Engineering Publication) volume 2 document. In the tests, the total and plastic deformations of the plate modelling the basic armour of the lower part of the vehicle in configurations without and with a shock wave absorbing element (energy absorber) were measured. The comb gage method reported by the US Army Developmental Test Command was used in measurements of the total deformation of the model. The study has shown that an appropriate design of the energy absorber and the use of suitable materials in its fabrication allow the total deformation to be reduced. Moreover in this article numerical simulations of the deformation phenomenon of the multi-layered energy absorbers were shown. Numerical simulations have shown high numerical model compliance compared to the experimental studies. In the studies were achieved about 99 percent numerical with the real model correlation. DOI: http://dx.doi.org/10.5755/j01.mech.23.6.14119
Highlights
Explosives buried in the ground such as mines or Improvised Explosive Devices (IED) present a particular threat to Light Armoured Vehicles (LAV)
The shock wave was generated by explosion of a 1.5 kg TNT blowing charge under the tested system with energy absorber, located 450 mm above the charge
Based on the tests described above, it has been shown that: 1. It is possible to estimate the energy absorbed by the energy absorber in the form of linear dimension as the difference between the maximum deformation of the system with no absorber and the system with the absorber under assessment
Summary
Explosives buried in the ground such as mines or Improvised Explosive Devices (IED) present a particular threat to Light Armoured Vehicles (LAV). Weight added to the vehicle has a smaller effect on vehicle mobility This allows shields to be used, fabricated of heavier and more rigid composite materials, but with sufficient plastic and elastic deformability, making use of structures of composite materials placed between the bottom of the vehicle hull and the crew compartment. A review of the literature indicates that vehicles with properly designed, heavier energy absorbing shields fabricated of appropriately selected materials are more resistant to higher exposure levels. This follows from the fact that they reduce the impact forces acting on the basic hull of the vehicle, and thereby directly influence crew injury rates. Irrespective of the military aspects, the research covers energy absorbing shields that can be used in civilian industries where gas detonation hazards occur, often combined with the outburst of solids, e.g. in mining operations where deposits are accompanied by methane, in drilling platforms or for the protection of government buildings against terrorist attacks [7, 8]
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