Abstract
In the following work, sacrificial claddings filled with different brittle materials were investigated, from concrete foam to granular media. They were subjected to blast loading using an explosive driven shock tube, while a sensor measures the load transmission and a high speed camera records the compression of the core. From a macroscopic point of view, concrete foam and granular media can act efficiently as a crushable core but differs greatly in terms of energy dissipation mechanisms. To compare them, granular media was at first treated as a cellular material, and different key parameters (plateau stress, densification strain) were computed using the energy absorption efficiency methodology. The presented tests results, coupled with observation in literature, allow a better understanding on the crushing process of a granular media. In particular, granular media tend to work as a core even for low intensity load, contrary to more classical crushable core.
Highlights
The general principle of blast protection consists in placing an energy absorbing material between the explosive charge and the target
The explosive driven shock tube is an excellent tool to study the behavior of a sacrificial cladding
It has been used for many cellular materials, but the study of granular media highlights the limits of this approach
Summary
The general principle of blast protection consists in placing an energy absorbing material between the explosive charge and the target. This material aims to mitigate the detonation of the explosive [1,2], to disturb the blast wave propagation [3], or to passively protect the target [4] Among these solutions, sacrificial claddings are passive architectures which allow to dissipate the blast wave energy and to improve the target’s resistance against such solicitation [4,5,6,7]. Sacrificial claddings are passive architectures which allow to dissipate the blast wave energy and to improve the target’s resistance against such solicitation [4,5,6,7] It is made of three components: a crushable core, sandwiched between a front plate and a rear plate. Plastic, and brittle deformation of the core leads to energy dissipation and the transmission of a lower, quasi-constant loading over a longer time span (Figure 1)
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