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Constitutive Modeling based on Evolutionary Multi-junctions of Dislocations



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


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
Conference Dates
May 7-9, 2014
Conference Location


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


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], (Accessed July 15, 2024)


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Created May 7, 2014, Updated November 10, 2018