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Vol. 29. Issue 1.
Materiais 2015
Pages e234-e238 (January - April 2017)
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Vol. 29. Issue 1.
Materiais 2015
Pages e234-e238 (January - April 2017)
DOI: 10.1016/j.ctmat.2016.06.006
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The role of tension-compression asymmetry of the plastic flow on ductility and damage accumulation of porous polycrystals
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J.L. Alvesa,
Corresponding author
jlalves@dem.uminho.pt

Corresponding author.
, M.C. Oliveirab, L.F. Menezesb, Oana Cazacuc
a MEMS - Microelectromechanical Systems Research Unit, Department of Mechanical Engineering, University of Minho, 4800-058 Portugal
b CEMUC, Department of Mechanical Engineering, University of Coimbra, Polo II, 3030-788, Portugal
c Department of Mechanical and Aerospace Engineering, University of Florida, REEF, FL 32579, USA
Article information
Abstract

The influence of the tension-compression asymmetry of the plastic flow, due to intrinsic single-crystal deformation mechanisms, on porosity evolution and the overall ductility of voided metallic polycrystals is assessed. To this end, detailed micromechanical finite-element analyses of three-dimensional unit cells containing a single initially spherical cavity are carried out. The plastic flow of the matrix (fully-dense material) is described by a criterion that accounts for strength-differential effects induced by deformation twinning of the constituent grains of the metallic polycrystalline materials. The dilatational response of porous polycrystals are calculated for macroscopic axisymmetric tensile loadings corresponding to a fixed value of the stress triaxiality and the two possible values of the Lode parameter. It is shown that damage accumulation, and ultimately ductility of the porous polycrystals are markedly different as compared to the case when the matrix is governed by von Mises criterion. Most importantly, a direct correlation is established between the macroscopic material parameter k that is intimately related to the particularities of the plastic flow of the matrix and the rate of damage accumulation.

Keywords:
Twinning
porous polycrystals
porosity evolution
ductility
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Copyright © 2017. Portuguese Society of Materials (SPM)
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