Skip to Main content Skip to Navigation
Theses

Tenue mécanique des assemblages soudés par point multi-tôles et acier multigrades : étude expérimentale, modélisation macroscopique et procédure d'identification

Abstract : Resistance spot welding (RSW) is widely used in the automotive industry. However, the prediction of their non-linear mechanical behavior and their failure in structural crashworthiness computations remains a challenge. The introduction of a new generation ofmulti-sheet multi-steel grade spot welded assemblies makes the prediction of their mechanical strength more complex.Despite the increasing use of these assemblies, the experimental study of their mechanical behavior is still very limited, while their macroscopic modeling has not yet been studied. An experimental device based on Arcan principle is thus proposed to characterize the mechanical strength and the failure of three-sheet spot welded assemblies, in pure and combined loads for different loading configurations. A macroscopic modeling approach is also proposed to simulate their mechanical behavior for structural applications. As a first step, a ’connector’ element is proposed, identified and validated for a two-sheet spot welded assembly. Then, a modeling approach using three connectors is proposed to simulate the mechanical behavior and the rupture of a three-sheet multi- steel grade spot welded assembly. An identification methodology is also presented to simplify the identification procedure of the model parameters. The model is identified and validated based on the experimental results of the Arcan tests carried out during this thesis.
Complete list of metadatas

Cited literature [14 references]  Display  Hide  Download

https://tel.archives-ouvertes.fr/tel-01710463
Contributor : Abes Star :  Contact
Submitted on : Friday, February 16, 2018 - 1:01:45 AM
Last modification on : Friday, September 18, 2020 - 3:15:59 AM
Long-term archiving on: : Monday, May 7, 2018 - 11:04:52 AM

File

Chtourou_Rim2.pdf
Version validated by the jury (STAR)

Identifiers

  • HAL Id : tel-01710463, version 1

Collections

Citation

Rim Chtourou. Tenue mécanique des assemblages soudés par point multi-tôles et acier multigrades : étude expérimentale, modélisation macroscopique et procédure d'identification. Mécanique des structures [physics.class-ph]. Université de Valenciennes et du Hainaut-Cambresis; École nationale d'ingénieurs de Sfax (Tunisie), 2017. Français. ⟨NNT : 2017VALE0017⟩. ⟨tel-01710463⟩

Share

Metrics

Record views

320

Files downloads

2559