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Modélisation du comportement mécanique et de la rupture en conditions dynamiques d’aciers de structure et à blindage

Abstract : The present study deals with the modelling of the thermo-viscoplastic behaviour and the failure of a structural steel “S355NL” and a naval armour steel. An experimental campaign have been performed to observe the mechanical response of these material over a wide range of conditions, especially their sensitivities to the strain rate (from 〖10〗^(-3) to ~〖10〗^4 s^(-1)) and to the temperature (from -100 to 200 °C). The obtained results have been used to identify the parameters of several constitutive relations. A new approach have been developed to improve the description of the strain rate sensitivity. These relations have been implemented in numerical simulation to model the impact of a projectile on these steels. The obtained results have been compared with corresponding experimental tests in order to assess the reliability of the data and the hypothesis used in the simulations.
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https://hal.univ-lorraine.fr/tel-02327889
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Submitted on : Wednesday, October 23, 2019 - 8:41:06 AM
Last modification on : Monday, March 30, 2020 - 8:45:23 AM
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  • HAL Id : tel-02327889, version 1

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Pïerre Simon. Modélisation du comportement mécanique et de la rupture en conditions dynamiques d’aciers de structure et à blindage. Mécanique des matériaux [physics.class-ph]. Université de Lorraine, 2019. Français. ⟨NNT : 2019LORR0042⟩. ⟨tel-02327889⟩

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