Intégration de la phase de mise en forme dans le dimensionnement de flasques de sièges automobile

Abstract : The purpose of this work is to model by digital simulation the mechanical strength of automotive seat flanges obtained by half-blanking of high yield strength steel sheets. Compression, tensile and shear tests are done in order to investigate plastic anisotropy, strain hardening, ductile damage and fracture. Non-proportional tests of shear followed by traction and of half-blanking followed by punching allow investigating the effect of predeformations at low stress triaxiality, on the behavior of the material loaded again at higher stress triaxiality. Based on the work of Xue and Wierzbicki, a fracture criterion that allows taking into account the experimental observations is proposed and compared to a Lemaitre damage model. The proposed fracture criterion is implemented in two finite element software programms: Forge®, dedicated to forming simulation and LS-Dyna®, dedicated to crash simulation. In a first step, forming by half-blanking is simulated with Forge®. In a second step, state variable fields are mapped from outcome mesh from Forge® to input mesh for LS-Dyna®. Then mechanical strength computations are performed using LS-Dyna®. Finally the mechanical strength computation results are compared to experimental results. These experimental results are forming tests by half-blanking followed by wrenching tests. These tests reproduce in the laboratory loading observed on industrial parts.
Document type :
Theses
Complete list of metadatas

Cited literature [42 references]  Display  Hide  Download

https://pastel.archives-ouvertes.fr/pastel-00907736
Contributor : Abes Star <>
Submitted on : Thursday, November 21, 2013 - 4:37:09 PM
Last modification on : Monday, November 12, 2018 - 10:59:54 AM
Long-term archiving on : Saturday, February 22, 2014 - 4:41:45 AM

File

2013ENMP0024.pdf
Version validated by the jury (STAR)

Identifiers

  • HAL Id : pastel-00907736, version 1

Citation

Jean-Marie Gachet. Intégration de la phase de mise en forme dans le dimensionnement de flasques de sièges automobile. Autre. Ecole Nationale Supérieure des Mines de Paris, 2013. Français. ⟨NNT : 2013ENMP0024⟩. ⟨pastel-00907736⟩

Share

Metrics

Record views

1699

Files downloads

1092