English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

This work proposes a dislocation density-based strain gradient $J_2$plasticity framework that models the strength contribution due to GeometricallyNecessary Dislocations (GNDs) using a lower order, Taylor hardening backstressmodel. An anisotropy factor is introduced to phenomenologically represent thedifferential hardening between grains in this $J_2$ plasticity framework. Animplicit numerical algorithm is implemented for the time integration of thefinite deformation plasticity model. The framework is first used to predictdirectional hardening due to the GND-induced backstress during cyclic loading.Deformation contours are studied to understand the substructure attributescontributing to directional hardening. The framework is then used to predictthe intrinsic, grain size-dependent strengthening of polygrain ensembles. Modelpredictions of simulations with different grain sizes are shown to agree withthe Hall-Petch effect and also with Ashby's model of hardening due to GNDs inpolygrain ensembles.

Modeling directional hardening and intrinsic size effects using a dislocation density-based strain gradient plasticity framework