International Journal of Material Forming

, Volume 8, Issue 1, pp 111–118 | Cite as

Numerical simulation of extruded clay paste compression

  • Jérémie Vignes
  • Fabrice Schmidt
  • Gilles Dusserre
  • Jean Frédéric Dalmasso
Original Research
  • 207 Downloads

Abstract

The manufacturing process of clay tiles includes a pressing step in which the material undergoes stresses, that may result in the appearance of defects. To understand the phenomena involved, a numerical model of the pressing step was developed. Different tests were performed to determine the different behaviour laws necessary to the numerical simulation (rheological, tribological, damage). A rheological study, based on free compression tests, allowed to charaterize the elasto-visco-plastic behaviour of the extruded clay paste. The constitutive parameters were estimated by inverse analysis of the experimental force displacement curves using a Strategic evolution algorithm coupled with a metamodel. Two damage models, the Latham and Crockoft criterion and the Oyane criterion, were compared to model the cracking. To simulate the crack’s propagation, an element deletion algorithm was used. The friction models of Coulomb and Tresca were investigated to model the global friction between the clay and the tools. The different parameters of the friction law were identified by inverse analysis of an experimental pressing force obtained during a shaping test. The identified model is valided on the case study of an instrumented forming of a tile lug and allows to simulate the shaping of an industrial tile.

Keywords

Clay forming Numerical simulation Constitutive law Free compression test Inverse analysis 

Nomenclature

E

Young’s modulus

K0

Consistency

m

Strain rate sensitivity parameter

\( \overline{\mathrm{m}} \)

Tresca’s friction parameter

μ

Coulomb’s friction parameter

n

Strain hardening sensitivity parameter

p

Hydrostatic pressure

\( {\overline{\upvarepsilon}}_{\mathrm{R}} \)

Equivalent plastic strain

\( {\overline{\upvarepsilon}}_{\mathrm{V}} \)

Equivalent viscoplastic strain

\( {\overset{\cdot }{\overline{\upvarepsilon}}}_{\mathrm{V}} \)

Equivalent viscoplastic strain rate

\( {\overline{\overline{\upvarepsilon}}}_{\mathrm{E}} \)

Elastic strain tensor

\( \overline{\overline{\mathrm{I}}} \)

Identity tensor

ν

Poisson’s ratio

σI, σII, σIII

Principal stresses

σ0

Flow stress

σn

Normal stress

\( \overline{\upsigma} \)

Von Mises stress

\( \overline{\overline{\upsigma}} \)

Stress tensor

τ

Shear stress

tr ()

Mathematical function Trace

Notes

Acknowledgments

The present study was supported by the Terreal company. The authors would like to acknowledge this industrial partner for this support and his help.

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Copyright information

© Springer-Verlag France 2013

Authors and Affiliations

  • Jérémie Vignes
    • 1
  • Fabrice Schmidt
    • 1
  • Gilles Dusserre
    • 1
  • Jean Frédéric Dalmasso
    • 2
  1. 1.Université de Toulouse; Mines Albi, INSA, UPS, ISAE, ICA (Institut Clément ADER)Albi cedex 09France
  2. 2.CRED TerrealCastelnaudaryFrance

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