Micropolar modeling approach for periodic sandwich beams

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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2018-02-01
Major/Subject
Mcode
Degree programme
Language
en
Pages
9
656-664
Series
Composite Structures, Volume 185
Abstract
A micropolar Timoshenko beam formulation is developed and used to model web-core sandwich beams. The beam theory is derived by a vector approach and the general solution to the governing sixth-order equations is given. A nodally-exact micropolar Timoshenko beam finite element is derived using the solution. Bending and shear stiffness coefficients for a web-core sandwich beam are determined through unit cell analysis, where the split of the shear forces into symmetric and antisymmetric parts plays a pivotal role. Static bending of web-core beams is studied using the micropolar model as well as modified couple-stress and classical Timoshenko beam models. The micropolar 1-D results are in best agreement with 2-D web-core beam frame results. This is because the micropolar beam allows antisymmetric shear deformation to emerge at locations where the 2-D web-core deformations cannot be reduced to 1-D by considering only symmetric shear behavior.
Description
Keywords
Finite element, General solution, Micropolar, Sandwich structures, Timoshenko beam
Other note
Citation
Karttunen, A T, Reddy, J N & Romanoff, J 2018, ' Micropolar modeling approach for periodic sandwich beams ', Composite Structures, vol. 185, pp. 656-664 . https://doi.org/10.1016/j.compstruct.2017.11.064