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Communication Dans Un Congrès Année : 2019

A spot weld simplified model based on reduced order modeling

Benoit Delattre
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Ida Raoult
Olivier Villars
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Résumé

In an automobile structure, a spot weld (SW) is a pointwise connection element where stress concentrations occur. Therefore, the region will be particularly exposed to fatigue failures, and a SW model for fatigue analysis is necessary. However, the large number of Spot welds (from 4000 to 6000) requires this SW model to be simplified. Multiple models have been developped to reproduce the SW behavior within a structur. They are mostly phenomenological and with a minimum numerical cost. Therefore, these models are limited. The purpose of this study is thus to propose an accurate model of connector (i.e. with a strong physical meaning, a wide domain of applications), that is based on a methodology adapted to the industrial constraints as a reasonable numerical cost. First, it is necessary to identify the Mechanical Influence Area (MIA) of the SW. In other words, the zone where 3D edge effects spreading around the connec-tor are leading to a no longer valid shell theory. Second, the development of a detailed methodology of construction of the connector model is necessary. From a well chosen basis of loadings, the mechanical response is recreated as a linear combination of spatial plate mode shapes, that are calculated by Singular Value Decomposition. The question of the connection of the calculated deformed modes to the finite element plate model used to model the whole structure, is treated and illustrated. The mechanical response of the prototype is compared to a a full 3D finite element models of an elementary welded assembly. An enrichment criteria for the initial basis of sollicitations is questioned. The numerical objects necessary for the implementation of such a connector in the software Abaqus V2016 R are listed.
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Dates et versions

hal-02392223 , version 1 (13-12-2019)

Identifiants

  • HAL Id : hal-02392223 , version 1

Citer

Florian Mainnemare, Benoit Delattre, Ida Raoult, Olivier Villars, Pierre-Alain Boucard, et al.. A spot weld simplified model based on reduced order modeling. MORTech 2019 - 5th International Workshop Reduced Basis, POD and PGD Model Reduction Techniques, Nov 2019, Paris, France. ⟨hal-02392223⟩
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