Observatorio de I+D+i UPM

Memorias de investigación
Research Publications in journals:
Micromechanics of Particle-reinforced Elasto-viscoplastic Composites: Finite Element Simulations Versus affine Homogenization
Year:2007
Research Areas
  • Materials
Information
Abstract
The micromechanics of elasto-viscoplastic composites made up of a random and homogeneous dispersion of spherical inclusions in a continuous matrix was studied with two methods. The first one is an affine homogenization approach, which transforms the local constitutive laws into fictitious linear thermo-elastic relations in the Laplace-Carson domain so that corresponding homogenization schemes can apply, and the temporal response is computed after a numerical inversion of Laplace transform. The second method is the direct numerical simulation by finite elements of a three-dimensional representative volume element of the composite microstructure. The numerical simulations carried out over different realizations of the composite microstructure showed very little scatter and thus provided -for the first time- "exact" results in the elasto-viscoplastic regime that can be used as benchmarks to check the accuracy of other models. Overall, the predictions of the affine homogenization model were excellent, regardless of the volume fraction of spheres, of the loading paths (shear, uniaxial tension and biaxial tension as well as monotonic and cyclic deformation), particularly at low strain rates. It was found, however, that the accuracy decreased systematically as the strain rate increased. The detailed information of the stress and strain microfields given by the finite element simulations was used to analyze the source of this difference, so that better homogenization methods can be developed.
International
Si
JCR
Si
Title
INT J PLASTICITY
ISBN
0749-6419
Impact factor JCR
4,516
Impact info
Volume
23
Journal number
6
From page
1041
To page
1060
Month
SIN MES
Ranking
Participants
  • Autor: O Pierard
  • Autor: Javier Segurado Escudero (UPM)
  • Autor: I Doghri
  • Autor: Fco. Javier Llorca Martinez (UPM)
Research Group, Departaments and Institutes related
  • Creador: Grupo de Investigación: Materiales Estructurales avanzados y nanomateriales
  • Departamento: Ciencia de los Materiales
S2i 2019 Observatorio de investigación @ UPM con la colaboración del Consejo Social UPM
Cofinanciación del MINECO en el marco del Programa INNCIDE 2011 (OTR-2011-0236)
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