Analyse de la pré-déformation plastique sur la tenue au crash d'une structure crash-box par approches expérimentale et numérique

Abstract : To preserve the integrity of vehicle passengers during a crash constitutes a major goal for the automotive manufacturers since many years. The aim of this Ph-D thesis is to analyze the effect of a plastic prestrain on crash properties of a crash-box structure. The loading history is composed of at least two phases. The first phase is the forming process, in general under quasi-static conditions. The subsequent loading is due to a crash event. The behavior of three steels frequently used in the automotive industry has been studied (BH260, DP600, TRIP800). The experimental characterization of the steels shows the effect of a quasi-static prestrain on subsequent dynamic tensile curves. In addition, a large experimental crushing campaign of structures revealed that the prestrain process improves the crash behavior despite a reduction of the wall thickness. Two phenomenological models are then proposed to describe the strain-hardening effects and strain-rate sensitivity of metals. The model predictions show a very good agreement with experimental results for a wide range of strain-rate. Strain-rate history effects are well accounted for by one of the models. Finally, a numerical approach is performed where the variables calculated during the stamping (residual stress, equivalent plastic deformation, final thickness) are taken into account during the crash simulation under dynamic loading
Document type :
Theses
Complete list of metadatas

Cited literature [143 references]  Display  Hide  Download

https://hal.univ-lorraine.fr/tel-01752867
Contributor : Thèses Ul <>
Submitted on : Thursday, March 29, 2018 - 2:00:39 PM
Last modification on : Monday, April 16, 2018 - 10:42:30 AM

File

Durrenberger.Laurent.SMZ0741.p...
Files produced by the author(s)

Identifiers

  • HAL Id : tel-01752867, version 1

Collections

Citation

Laurent Durrenberger. Analyse de la pré-déformation plastique sur la tenue au crash d'une structure crash-box par approches expérimentale et numérique. Autre. Université Paul Verlaine - Metz, 2007. Français. ⟨NNT : 2007METZ041S⟩. ⟨tel-01752867⟩

Share

Metrics

Record views

402

Files downloads

193