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Constitutive Modeling based on Evolutionary Multi-junctions of Dislocations

Published

Author(s)

Minh-Son Pham, Adam A. Creuziger, Mark A. Iadicola, Timothy J. Foecke, A.D. Rollett

Abstract

A latent hardening model based on the binary junction-induced hardening can effectively describe the plastic anisotropic response. However, this approach still has some descriptive and predictive limitations. Recent findings show that binary junctions generated by interactions of pairs of dislocations can only induce short-term hardening effect due to the unzipping process of binary junctions. In contrast, multi-junctions, which are formed thanks to multiple interactions of dislocations, can cause strong and endurable influences on the hardening of polycrystals. In this study, we consider the evolution of dislocation junctions from the binary to multi-junctions, and implement this evolution into a self-consistent visco-plastic model. An application of this model for predicting the yield surface and texture evolution of AA5754 during uniaxial and plane strain loadings is given as a demonstration for the capabilities of the evolutionary binary-multi junction approach.
Proceedings Title
ESAFORM 2014
Volume
611-612
Conference Dates
May 7-9, 2014
Conference Location
Espoo

Keywords

crystal plasticity, constitutive law, dislocation interactions, latent hardening, aluminum

Citation

Pham, M. , Creuziger, A. , Iadicola, M. , Foecke, T. and Rollett, A. (2014), Constitutive Modeling based on Evolutionary Multi-junctions of Dislocations, ESAFORM 2014, Espoo, -1, [online], https://doi.org/10.4028/www.scientific.net/KEM.611-612.1771 (Accessed July 15, 2024)

Issues

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Created May 7, 2014, Updated November 10, 2018