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On coupled gradient-dependent plasticity and damage theories with a view to localization analysis

✍ Scribed by René de Borst; Jerzy Pamin; Marc G.D. Geers

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
565 KB
Volume
18
Category
Article
ISSN
0997-7538

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✦ Synopsis

Combinations of gradient plasticity with scalar damage and of gradient damage with isotropic plasticity are proposed and implemented within a consistently linearized format. Both constitutive models incorporate a Laplacian of a strain measure and an internal length parameter associated with it, which makes them suitable for localization analysis.

The theories are used for finite element simulations of localization in a one-dimensional model problem. The physical relevance of coupling hardening/softening plasticity with damage governed by different damage evolution functions is discussed. The sensitivity of the results with respect to the discretization and to some model parameters is analyzed. The model which combines gradient-damage with hardening plasticity is used to predict fracture mechanisms in a Compact Tension test.

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✍ C. L. Chow; X. F. Chen 📂 Article 📅 1993 🏛 Springer Netherlands 🌐 English ⚖ 630 KB

An anisotropic model of damage mechanics for ductile fracture incorporating the endochronic theory of plasticity is presented in order to take into account material deterioration during plastic deformation. An alternative form of endochronic (internal time) theory which is actually an elasto-plastic