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Moyens d'essais et de caractérisation de lois de comportement en dynamique moyennes vitesses

Abstract : Numerical simulation relative to transportation frameworks crashworthiness requires the knowledge of multiplicative work-hardening models' parameters. There identification is based on reliable experimental data from quasi-static to dynamic loadings. To verify the superposition of the experimental data extracted from no-covering devices, a method of improvement is proposed for a sheet specimens characterisation set-up using a high-speed hydraulic machine to through out the main natural frequency. An iterative experimental/numerical coupling is built. The access to plastic strain rates up to 300 s-1 becomes possible for metallic materials. In the other hand, a no-direct tensile testing device is lead using a split Hopkinson bars apparatus so as to reach a low limit closed to 200 s-1. An original tensile set-up using glued plate specimens is designed. The relations are confronted each over for the same strain rates, approximately.
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Submitted on : Wednesday, November 17, 2021 - 3:34:53 PM
Last modification on : Friday, December 10, 2021 - 3:55:59 AM
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  • HAL Id : tel-03433045, version 1


Grégory Haugou. Moyens d'essais et de caractérisation de lois de comportement en dynamique moyennes vitesses. Mécanique []. Université de Valenciennes et du Hainaut-Cambrésis, 2003. Français. ⟨NNT : 2003VALE0032⟩. ⟨tel-03433045⟩



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