期刊
INTERNATIONAL JOURNAL OF PLASTICITY
卷 78, 期 -, 页码 242-265出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijplas.2015.09.002
关键词
Bcc crystal plasticity; Yield stress; Non-Schmid effects; Screw dislocations; Single crystal tungsten
资金
- U.S. Department of Energy by Lawrence Livermore National Laboratory [DE-AC52-07NA27344]
- DOE's Early Career Research Program
- Consejo Social
- Universidad Politecnica de Madrid
We use a physically-based crystal plasticity model to predict the yield strength of body centered cubic (bcc) tungsten single crystals subjected to uniaxial loading. Our model captures the thermally-activated character of screw dislocation motion and full non Schmid effects, both of which are known to play critical roles in bcc plasticity. The model uses atomistic calculations as the sole source of constitutive information, with no parameter fitting of any kind to experimental data. Our results are in excellent agreement with experimental measurements of the yield stress as a function of temperature for a number of loading orientations. The validated methodology is employed to calculate the temperature and strain-rate dependence of the yield strength for 231 crystallographic orientations within the standard stereographic triangle. We extract the strain-rate sensitivity of W crystals at different temperatures, and finish with the calculation of yield surfaces under biaxial loading conditions that can be used to define effective yield criteria for engineering design models. (C) 2015 Elsevier Ltd. All rights reserved.
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