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Bridging Atomistic/Continuum Scales in Solids with moving dislocations

Chinese Physics Letters 2007年第1期24卷 161-164页

作者：唐少强 LIU Wing K KARPOV Eduard G. 侯一钊 LTCS Department of Mechanics and Aerospace Engineering Peking University Beijing 100871 Department of Mechanical Engineering Northwestern University Evanston IL 60208 USA Applied and Computational Mathematics California Institute of Technology Pasadena CA 91125 USA

We propose a multiscale method for simulating solids with moving dislocations. Away from atomistic subdomains where the atomistic dynamics are fully resolved, a dislocation is represented by a localized jump profile, superposed on a defect-free field. We assign a thin relay zone around an atomistic subdomain to detect the dislocation profile and its propagation speed at a selected relay time. The detection technique utilizes a lattice time history integral treatment. After the relay, an atomistic computation is performed only for the defect-free field. The method allows one to effectively absorb the fine scale fluctuations and the dynamic dislocations at the interface between the atomistic and continuum domains. In the surrounding region, a coarse grid computation is adequate.

关键词： multiscale method moving dislocations dislocation atomistic subdomain

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A Dislocation-based Model for the Dynamics of Sliding Precursors

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Acta Mechanica Solida Sinica 2021年第5期34卷 624-631页

作者： Yiran Li Ganyun Huang Department of Mechanics School of Mechanical EngineeringTianjin UniversityTianjin300350China

The onset of dynamic friction plays an important role in the study of sliding ***,the sliding precursors in the form of crack-like defects have been detected in experiments and their strain fields have been measured to be comparable to those of moving *** the present work,we considered the dynamics of sliding precursors by solving the elastic problem due to a moving dislocation in a half-plane and the transient emission of a dislocation at the *** has been found that both the strain field of a moving dislocation and the spatiotemporal evolution agree well with those of a sliding precursor detected in *** results may cast new light to the dynamics of sliding onset.

关键词： Sliding precursor Crack-like defects moving dislocations Dislocation emission

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