A new way to identify thin sheet behaviour: Micro-InDef

Pierrick Malecot Malecot,Sebastien Thibaud,Gemala Hapsari,Fabrice Richard

doi:10.46336/ijqrm.v1i2.33

Pierrick Malecot Malecot, Sebastien Thibaud + Show 2 more

Open Access

https://doi.org/10.46336/ijqrm.v1i2.33

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Abstract

Incremental forming is a rapid prototyping process which uses a forming tool toform a sheet metal according to a predetermined trajectory. In this work, a micro incremental deformation test (Micro InDef test) derived from the principle of single point incremental sheet forming is developed and proposed. A complex mechanical loading is applied and has a strong potential for the identication of inelastic behavior using inverse method. In the rst part, this work addresses the parameters identication and validation procedures of ductile damage behavior of ultra-thin sheet metal under very large strain during this instrumented Micro InDef test. An inverse nite element method based on the comparison between numerical and experimental axial forming forces of the micro incremental deformation test is employed to extract a coupled ductile damaged plastic model. In the second part, the objective is to prove the reliability of ductile damage parameters identication using forming force. The richness of data contained in forming force is quantied and compared to the one from tensile test. Firstly, the verication of the estimated parameter's reliability is done via a simple analysis based on the forming force sensitivity to material parameters and secondly by calculating elastoplastic and elastoplastic with ductile damage.

Highlights

The mastery of numerical modeling is a preliminary step in processes optimizations and in understanding complex phenomena
Several studies have shown that the force predictions made from finite element (FE) simulations of incremental sheet deformation are sensitive to material parameters, for example Henrard et al [1] and Duflou et al [2] found that axial forming force is the dominant force and is close to the total force
This work is dedicated to the complete definition of the identification and identifiability of the ductile damage behavior of ultra-thin sheet metal under notably large strain via the Micro InDef test

Summary

Introduction

The mastery of numerical modeling is a preliminary step in processes optimizations and in understanding complex phenomena. Several studies have shown that the force predictions made from finite element (FE) simulations of incremental sheet deformation are sensitive to material parameters, for example Henrard et al [1] and Duflou et al [2] found that axial forming force is the dominant force and is close to the total force. For these reasons we decided to use the axial force as data for inverse problem approach using the finite element model updating (FEMU). A practical identifiability analysis is performed to quantify the information richness of forming forces measurement

Material and methods

Results and discussion

Conclusions