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- Title
Geometrically-Compatible Dislocation Pattern and Modeling of Crystal Plasticity in Body-Centered Cubic (BCC) Crystal at Micron Scale Dedicated to Professor Karl Stark Pister for his 95th birthday.
- Authors
Yuxi Xie; Shaofan Li
- Abstract
The microstructure of crystal defects, e.g., dislocation patterns, are not arbitrary, and it is possible that some of them may be related to the microstructure of crystals itself, i.e., the lattice structure.We call those dislocation patterns or substructures that are related to the corresponding crystal microstructure as the Geometrically Compatible Dislocation Patterns (GCDP). Based on this notion, we have developed aMultiscale Crystal Defect Dynamics (MCDD) to model crystal plasticity without or with minimum empiricism. In this work, we employ the multiscale dislocation pattern dynamics, i.e., MCDD, to simulate crystal plasticity in body-centered cubic (BCC) single crystals, mainly α-phase Tantalum (α-Ta) single crystals. The main novelties of the work are: (1) We have successfully simulated crystal plasticity atmicron scalewithout any empirical parameter inputs; (2)We have successfully employedMCDD to perform direct numerical simulation of inelastic hysteresis of the BCC crystal; (3)We have used MCDD crystal plasticity model to demonstrate the size-efect of crystal plasticity and (4)We have captured cross-slip which may lead to size-efect.
- Subjects
CRYSTAL models; CRYSTAL defects; CRYSTALS; SINGLE crystals; DISLOCATIONS in crystals; TANTALUM; DISLOCATIONS in metals
- Publication
CMES-Computer Modeling in Engineering & Sciences, 2021, Vol 129, Issue 3, p1419
- ISSN
1526-1492
- Publication type
Article
- DOI
10.32604/cmes.2021.016756