A physically based model for bcc materials including non-Schmid effects and its application to single crystals of alpha-iron at different model scales

Joudivand Sarand, Mohammad Hasan and Demir, Eralp (2021) A physically based model for bcc materials including non-Schmid effects and its application to single crystals of alpha-iron at different model scales. Modelling and Simulation in Materials Science and Engineering, 29 (5). ISSN 0965-0393 (Print) 1361-651X (Online)

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Abstract

A dislocation density based model is developed to govern physics of complex mechanical behavior of bcc materials. Non-Schmid effects are incorporated into a novel dislocation density based model by using three-term projection operators. The model is used to explain dependence of mechanical response to crystal orientation, temperature, strain-rate and as well as tension-compression asymmetry. Simulations at different scales that include; a material point, a single finite element and a finite element model of exact test geometry are performed. The proposed model successfully captures crystal orientation, temperature, and strain-rate dependence of the experimentally observed stress-strain curves and also well explain the tension-compression asymmetry of experimental flow stresses of α-iron. The forest projection scheme that uses the slip plane normal, hardening interactions between slip systems for bcc materials, non-Schmid projections, and Peierls energy barrier for thermal activation of slip are important features of the model to imitate experimental mechanical behavior of bcc materials successfully at all scales with a better agreement though a finite element model considering exact tensile speciment geometry.
Item Type: Article
Uncontrolled Keywords: bcc; crystal plasticity; non-Schmid effects; physics based modeling; single crystal
Divisions: Faculty of Engineering and Natural Sciences
Integrated Manufacturing Technologies Research and Application Center
Depositing User: Eralp Demir
Date Deposited: 04 Sep 2022 13:20
Last Modified: 04 Sep 2022 13:20
URI: https://research.sabanciuniv.edu/id/eprint/43517

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