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国际多尺度计算工程期刊
影响因子: 1.016 5年影响因子: 1.194 SJR: 0.554 SNIP: 0.68 CiteScore™: 1.18

ISSN 打印: 1543-1649
ISSN 在线: 1940-4352

国际多尺度计算工程期刊

DOI: 10.1615/IntJMultCompEng.2013005705
pages 505-525

ADAPTIVE ATOMISTIC-CONTINUUM MODELING OF DEFECT INTERACTION WITH THE DEBDM

Philip Moseley
Department of Mechanical Engineering, Northwestern University, Evanston, Illinois, USA
Jay Oswald
School for Engineering of Matter, Transport and Energy, Arizona State University, Phoenix, Arizona, USA
Ted Belytschko
Department of Mechanical Engineering, Northwestern University, Evanston, Illinois, USA

ABSTRACT

New procedures for modeling interactions among dislocations and nanosized cracks within the dynamically evolving bridging domain method (DEBDM) have been developed. The DEBDM is an efficient concurrent atomistic-to-continuum approach based on the bridging domain method, where the atomic domain dynamically adapts to encompass evolving defects. New algorithms for identifying and coarse graining dislocation-induced slip planes have been added to the method, which previously focused on fracture. Additional improvements include continuously varying BDM energy-weighting functions, which allow the fine-graining and coarse-graining transitions to occur smoothly over multiple timesteps, reducing the potential for nonphysical or unstable behavior. Several examples of interacting dislocations and nanocracks are presented to demonstrate the flexibility and efficiency of the method.

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