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发表时间：2008-01-01

发表刊物：力学学报

卷号：40

期号：6

页面范围：776-785

ISSN号：0459-1879

摘要：The effective properties of grid material based on classical continuum
   model have been widely investigated.Moreover, grid material is often
   used as thin-walled structures and the corresponding size of
   macro-structure (L) has the same magnitude with the characteristic
   length (lm) of the grid material.Thepurpose of this paper is to
   introduce an effective couple-stress continuum model to describe the
   performance of grid material when L lm and to recommend a method to
   calculate the effective moduli of the model.The representative volume
   element (RVE) method Dirichlet boundary conditions is proposed.The
   effectivebeam stiffness of couple-stress continuum is deduced with a new
   parameter S as for the couple-stress influence factor.The theoretical
   analysis is validated with finite elements (FE) solutions with the cases
   of some typical grid materials.The results show that couple-stress
   continuum model can be used to evaluate grid material and obtain the
   effective material parameters.The couple-stress effect is obvious only
   when Llm.Furthermore,the characteristic length of the grid material is
   influenced by the relativity density, the size of the base cell and the
   geometry.

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