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Fields in Non-Degenerate 1D3D Elastic Multi-Structures
( 1 Department of Mathematics, University of Linköping, S-581 83 Linköping, Sweden 2 Department of Mathematical Sciences, University of Liverpool, Liverpool L69 3BX )
We analyse 1D3D elastic multi-structures defined as solids involving finite-size three-dimensional elastic regions connected with thin rods. In the limit, when the thickness of the thin rods tends to zero, one has a union of a three-dimensional region and a set of thin rods. Classes of degenerate and non-degenerate multi-structures are specified, and asymptotic expansions of solutions of mixed boundary-value problems of linear elasticity are constructed. Asymptotic analysis, given in this work, provides rigorous justification of the existing engineering pile-structure models, and it also enables one to construct new models of high accuracy.