Étude dynamique pour définition d'aciers de blindage innovants contre les explosions

Abstract : The main aim of this PhD thesis is to develop a comprehensive study of the dynamic behavior of three armor steels subjected to ballistic impact. In order to have better understanding of the phenomena which take place during the thin targets perforation process, characterization experiments allowing to describe of the thermo-viscoplastic behavior and fracture were carried out. The identification of the constitutive relations and the failure criteria parameters allow to establish a numerical model simulating the perforation test. The ballistic response of armor steels subjected to the impact of conical projectiles was then assessed using perforation testing. This experimental investigation aims at endorsing the implementation of the behavior and fracture models in the calculation software. An experimental set-up for perforation forces measurements was specially developed during the thesis. It has been found that this dynamic force measurement is not intrinsic to the target material. It is rather dependent on the structural response of the used set-up support-target during impact and perforation. The numerical results from the Finite Elements Analysis (FEA) were compared to the experimental data and good agreement was found in terms of ballistic curves, failure patterns, impact forces and energy balance. Numerical investigations show that only an accurate description of the mechanical behavior and the fracture allows a good prediction of the ballistic performances of armor steels. Close attention was paid to the influence of local stress triaxiality induced by the projectile nose shape, strain rate and temperature on the strain to fracture threshold. In the future, these investigations can be used in the behavior analysis of armor steels subjected to blast loading
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https://hal.univ-lorraine.fr/tel-01923186
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Submitted on : Thursday, November 15, 2018 - 9:40:30 AM
Last modification on : Tuesday, May 28, 2019 - 3:40:16 PM

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  • HAL Id : tel-01923186, version 1

Citation

Imen Asma Mbarek. Étude dynamique pour définition d'aciers de blindage innovants contre les explosions. Science des matériaux [cond-mat.mtrl-sci]. Université de Lorraine, 2017. Français. ⟨NNT : 2017LORR0189⟩. ⟨tel-01923186⟩

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