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A micropolar theory for the finite elasticity of open-cell cellular solids
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Lightweight Structures.
2009 (English)In: Proceedings of the Royal Society. Mathematical, Physical and Engineering Sciences, ISSN 1364-5021, E-ISSN 1471-2946, Vol. 465, no 2103, 843-865 p.Article in journal (Refereed) Published
Abstract [en]

A mechanistic model is presented for an open-cell cellular solid consisting of a threedimensional network of elastic struts. By considering the bending and torsion as well as stretching and buckling of the struts, we allow for length-scale effects in the macroscopic response. Constitutive equations are developed for the force and couple stress tensors, accounting for finite deformations and anisotropy. The consistent tangent stiffness operators are derived and the equations are fully implemented in a nonlinear twodimensional finite-element solution scheme for the coupled displacement/rotation problem. A boundary-value problem of a shear gap with prescribed boundary rotations is analysed, and the model is shown to predict the well-known gap size effect. The mechanistic model allows some detailed interpretation of the micropolar behaviour, such as the effects of strut slenderness, strut length and anisotropy.

Place, publisher, year, edition, pages
2009. Vol. 465, no 2103, 843-865 p.
Keyword [en]
Cosserat theory, Finite element methods, Foams, Large deformations, Micromechanics, Micropolar continuum, Boundary rotations, Cellular solids, Consistent tangents, Couple stress, Elastic struts, Finite deformations, Finite elasticity, Finite-element, Gap size, Length scale, Macroscopic response, Mechanistic models, Micropolar, Micropolar theories, Open-cell, Three-dimensional networks, Anisotropy, Constitutive equations, Deformation, Finite element method, Nonlinear equations, Struts
National Category
Applied Mechanics
URN: urn:nbn:se:kth:diva-80030DOI: 10.1098/rspa.2008.0267ISI: 000262866900010ScopusID: 2-s2.0-67149139428OAI: diva2:496091

QC 20120210

Available from: 2012-02-09 Created: 2012-02-09 Last updated: 2016-04-27Bibliographically approved

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Toll, Staffan
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