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Computational Mechanics

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31.01.2020 | Original Paper

Strain gradient finite element model for finite deformation theory: size effects and shear bands

verfasst von: Yooseob Song, George Z. Voyiadjis

Erschienen in: Computational Mechanics | Ausgabe 5/2020

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Abstract

In this work, a thermodynamically consistent constitutive formulation for the coupled thermomechanical strain gradient plasticity theory is developed in the context of the finite deformation framework. A corresponding finite element solution is presented to investigate the microstructural features of metallic volumes. The developed model is established based on an extra Helmholtz-type partial differential equation, and the nonlocal quantity is calculated in a coupled method based on the equilibrium conditions. This approach is well known for its computational strength, however, it is also commonly accepted that it cannot capture the size effect phenomenon observed in the micro-/nanoscale experiments during hardening. In order to resolve this issue, a modified strain gradient approach which can capture the size effects under the finite deformation is constructed in this work. The shear problem is then solved to carry out the feasibility study of the developed model on the size effect phenomenon. Lastly, a plane strain problem under uniaxial tensile loading with shear bands is examined to perform the mesh sensitivity tests of the model during softening.

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\( {\mathcal{B}}_{i} \) is assumed to be strictly energetic in this work.

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Titel: Strain gradient finite element model for finite deformation theory: size effects and shear bands
verfasst von: Yooseob Song
George Z. Voyiadjis
Publikationsdatum: 31.01.2020
Verlag: Springer Berlin Heidelberg
Erschienen in: Computational Mechanics / Ausgabe 5/2020
Print ISSN: 0178-7675
Elektronische ISSN: 1432-0924
DOI: https://doi.org/10.1007/s00466-020-01816-2

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