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Investigation of the multiple-fragmentation process and post-fragmentation behaviour of dense and nacre-like alumina ceramics by means of tandem impact experiments and tomographic analysis

Abstract : During the impact by an armour-piercing projectile against a bilayer ceramic/backing protective system, dynamic tensile stresses are generated leading to the inception and the propagation of numerous and oriented cracks. This intense tensile damage, called fragmentation, affects the performances of the shielding and its capacity to resist to multiple impact. The residual confined strength of a fragmented ceramic is relatively weak compared to its undamaged compressive strength, however not negligible. Characterising the dynamic behaviour of a pre-fragmented ceramic is then of interest to design improved armour solutions. In this work, an impact configuration called tandem test, which consists in a normal impact followed by a penetrating impact, is applied to two alumina ceramics with different microstructures: a conventional 98% pure alumina compared to a bioinspired brick-and-mortar ceramic called “MAINa” (a nacre-like alumina) which exhibits higher flexural strength and fracture-toughness. Following the normal impact tests, a fragments size analysis is conducted by means of X-ray micro-computed tomography distribution, which reveals that the mean fragments size is significantly larger in the nacre-like alumina, thus demonstrating a correlation between the fragments size and the penetrating resistance of fragmented alumina ceramic. Finally, the strength of both alumina ceramics in their fragmented state is identified based on an inverse approach in which the penetrating tests are numerically simulated considering the Drucker-Prager model.
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https://hal.archives-ouvertes.fr/hal-03225774
Contributor : Yannick Duplan Connect in order to contact the contributor
Submitted on : Thursday, May 13, 2021 - 5:05:21 AM
Last modification on : Tuesday, October 19, 2021 - 11:26:47 AM

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Distributed under a Creative Commons Attribution - NonCommercial - NoDerivatives 4.0 International License

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UGA | CNRS | 3S-R

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Yannick Duplan, Pascal Forquin. Investigation of the multiple-fragmentation process and post-fragmentation behaviour of dense and nacre-like alumina ceramics by means of tandem impact experiments and tomographic analysis. International Journal of Impact Engineering, Elsevier, 2021, 155, pp.103891. ⟨10.1016/j.ijimpeng.2021.103891⟩. ⟨hal-03225774⟩

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