Dislocation impediment by the grain boundaries in polycrystals

• Published in: Acta mechanica Vol. 232; no. 8; pp. 3193 - 3213
• Main Authors: Piao, Yinguang, Le, Khanh Chau
• Format: Journal Article
• Language: English
• Published: Vienna Springer Vienna 01-08-2021; Springer; Springer Nature B.V
• Subjects: Classical and Continuum Physics; Control; Dynamical Systems; Engineering; Engineering Fluid Dynamics; Engineering Thermodynamics; Force and energy; Grain boundaries; Heat and Mass Transfer; Original Paper; Polycrystals; Shear tests; Solid Mechanics; Stress-strain curves; Theoretical and Applied Mechanics; Thermodynamics; Vibration
• ISSN: 0001-5970; 1619-6937
• DOI: 10.1007/s00707-021-03007-3

Thermodynamic dislocation theory incorporating dislocation impediment by the grain boundaries is developed to analyze the shear test of polycrystals. With a small set of physics-based material parameters, we are able to simulate the stress–strain curves for the load and its reversal, which are consistent with the experimental curves of Thuillier and Manach (Int J Plast 25:733–751, 2009). Representative distributions of plastic slip under load and its reversal are presented, and their evolution explains the extended length of the transition stage during load reversal.