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International Journal for Multiscale Computational Engineering
IF: 1.016 5-Year IF: 1.194 SJR: 0.554 SNIP: 0.82 CiteScore™: 2

ISSN Print: 1543-1649
ISSN Online: 1940-4352

International Journal for Multiscale Computational Engineering

DOI: 10.1615/IntJMultCompEng.2012002929
pages 461-486


Darby Luscher
Los Alamos National Laboratory
David L. McDowell
School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, USA; GWW School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, USA
Curt Bronkhorst
Los Alamos National Laboratory


A second gradient continuum description developed, for example, by Germain, Toupin and Mindlin, and Eringen, gives rise to strain gradient plasticity, and is becoming a common coarse scale basis for multiscale homogenization of material response that respects the non-local nature of heterogeneous fine scale material response. Such homogenization approaches are developed to build either concurrent or hierarchical multiscale computational models for the second gradient response at the coarse scale that represent salient aspects of material response at the fine scale. Typically, the homogenization procedure consists of solving an initial boundary value problem for a statistical volume element of heterogeneous material at the fine scale and computing coarse scale stresses and strains using various volume averaging procedures. By enforcing a kinematically consistent description of the deformation field at each scale and asserting invariance of linear momentum with respect to scale of observation of a fixed set of mass particles, critical features of the boundary conditions and computation of homogenized stresses are revealed. In particular, an internal constraint on the higher-order fluctuation field is required to ensure orthogonality between that part of the fine scale deformation attributed to the second gradient and the part associated with higher-order fluctuations. Additionally, the body forces resulting from such internal constraints must be included in the computation of coarse scale stresses to respect scale invariance of linear momentum at each scale. Numerical implementation of fine scale fluctuation constraints employs linear constraint equations; the computation of coarse scale stresses is facilitated through a multiscale statement of principle of virtual velocities. Example fine scale simulations and associated coarse scale homogenization are presented to illustrate aspects of the boundary conditions.


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