Abstract
Movement of dislocations and their interaction with grain boundaries during yielding process of metal polycrystals are numerically simulated . Simulation results show that when the size of Frank-Read source is close to grain diameter, the resolved shear stress needed to emit a dislocation loop increases sharply with decreasing grain size. This effect is introduced into the critical resolved shear stress, which is used in the continuum mechanics-based crystal plasticity analysis. Results of the analyses of polycrystal models show distinct increases of yield stress for specimens with smaller mean grain diameter. Evolution of geometrically necessary dislocations in fine- and coarse-grained polycrystals are discussed.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
