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Computers and Concrete Volume 1, Number 4, November 2004 , pages 433-455 DOI: https://doi.org/10.12989/cac.2004.1.4.433 |
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Numerical simulations of localization of deformation in quasi-brittle materials within non-local softening plasticity |
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J. Bobinski and J. Tejchman
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| Abstract | ||
| The paper presents results of FE-calculations on shear localizations in quasi-brittle materials during both an uniaxial plane strain compression and uniaxial plane strain extension. An elasto-plastic model with a linear Drucker-Prager type criterion using isotropic hardening and softening and non-associated flow rule was used. A non-local extension was applied in a softening regime to capture realistically shear localization and to obtain a well-posed boundary value problem. A characteristic length was incorporated via a weighting function. Attention was focused on the effect of mesh size, mesh alignment, non-local parameter and imperfections on the thickness and inclination of shear localization. Different methods to calculate plastic strain rates were carefully discussed. | ||
| Key Words | ||
| brittle material; compression; extension; material softening; non-locality; plasticity; shear localization. | ||
| Address | ||
| Civil Engineering Department, Gdansk University of Technology, 80-952 Gdansk,rnNarutowicza 11/12, Poland | ||