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Crystals 2017, 7(6), 181; doi:10.3390/cryst7060181

Combining Single- and Poly-Crystalline Measurements for Identification of Crystal Plasticity Parameters: Application to Austenitic Stainless Steel

Reactor Engineering Division, Jožef Stefan Institute, Jamova cesta 39, SI-1000 Ljubljana, Slovenia
These authors contributed equally to this work.
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Received: 24 April 2017 / Revised: 12 June 2017 / Accepted: 16 June 2017 / Published: 21 June 2017
(This article belongs to the Special Issue Plasticity of Crystals and Interfaces)
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Abstract

Crystal plasticity finite element models have been extensively used to simulate various aspects of polycrystalline deformations. A common weakness of practically all models lies in a relatively large number of constitutive modeling parameters that, in principle, would require dedicated measurements on proper length scales in order to perform reliable model calibration. It is important to realize that the obtained data at different scales should be properly accounted for in the models. In this work, a two-scale calibration procedure is proposed to identify (conventional) crystal plasticity model parameters on a grain scale from tensile test experiments performed on both single crystals and polycrystals. The need for proper adjustment of the polycrystalline tensile data is emphasized and demonstrated by subtracting the length scale effect, originating due to grain boundary strengthening, following the Hall–Petch relation. A small but representative volume element model of the microstructure is identified for fast and reliable identification of modeling parameters. Finally, a simple hardening model upgrade is proposed to incorporate the grain size effects in conventional crystal plasticity. The calibration strategy is demonstrated on tensile test measurements on 316L austenitic stainless steel obtained from the literature. View Full-Text
Keywords: crystal plasticity; multi-scale calibration; Hall–Petch effect; tensile test; finite element simulation; austenitic stainless steel crystal plasticity; multi-scale calibration; Hall–Petch effect; tensile test; finite element simulation; austenitic stainless steel
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El Shawish, S.; Cizelj, L. Combining Single- and Poly-Crystalline Measurements for Identification of Crystal Plasticity Parameters: Application to Austenitic Stainless Steel. Crystals 2017, 7, 181.

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