Modélisation et simulation de procédés de mise en forme de tôles métalliques ultrafines

Abstract : The on-going trend on device miniaturization has increased the demand forminiature parts and boosted micro forming processes. However, the mechanical behavior of ultra-thin sheet metals is subjected to certain peculiarities which are driven from the reduced number of grains in the sheets. The present work aimed to provide a numerical tool for the prediction of the mechanical behavior of ultra-thin sheet metals. The mechanical behavior of two copper alloys, CuBe2 and CuFe2P, was experimentally characterized through several strain paths. Various characteristics have been revealed, such as the anisotropic response, Bauschinger effect and the decrease of the Young modulus.In order to build a modeling frame capable of describing thin metal sheets which exhibit a highly heterogeneous behavior and those whose response is more homogeneous, two modeling approaches were considered. On one hand, a phenomenological model based on the experimental results is chosen. On the other hand, a crystal plasticity based model, which takes into account the physical deformation mechanisms, is adopted. Both models were implementedin ABAQUS and SiDoLo softwares, under the finite strain formalism. Parametric identification strategies are devised and the influence of calibration on models performance is assessed.Ultimately, the modeling approaches were applied to the simulation of industrial processes and academic tests. A numerical study on relevant parameters for the prediction of springback has been performed. The accurate modeling of elasticity proved highly influential.
Complete list of metadatas

Cited literature [103 references]  Display  Hide  Download

https://pastel.archives-ouvertes.fr/tel-01563545
Contributor : Abes Star <>
Submitted on : Monday, July 17, 2017 - 5:45:07 PM
Last modification on : Tuesday, May 28, 2019 - 3:40:14 PM
Long-term archiving on : Saturday, January 27, 2018 - 1:03:34 AM

File

ADZIMA.pdf
Version validated by the jury (STAR)

Identifiers

  • HAL Id : tel-01563545, version 1

Citation

Francis Adzima. Modélisation et simulation de procédés de mise en forme de tôles métalliques ultrafines. Mécanique des matériaux [physics.class-ph]. Ecole nationale supérieure d'arts et métiers - ENSAM, 2016. Français. ⟨NNT : 2016ENAM0066⟩. ⟨tel-01563545⟩

Share

Metrics

Record views

1089

Files downloads

5827