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Keywords: sandwich beams, beam elements, four point bending tests, validation.

Summary

This paper presents a new sandwich beam finite element with transversely compressible core and laminated composite face layers. The model is intended to study the bending behaviour of sandwich beams with application to bridge decks [1]. The model is validated with experimental results conducted on several specimens of sandwich beams with steel faces and polyurethane core. A three-dimensional finite element solution is also used for comparison purposes.

The sandwich beam model is based on a layerwise approach in which the core is modelled according to a higher order shear deformation theory and the composite laminated face layers are modelled using a first order shear deformation theory. The formulation follows the same approach as described in Araújo et al. [2] but with transverse compressibility of the core included. The constitutive laws for material behaviour are obtained from the three-dimensional elasticity matrices for orthotropic materials with kinematic assumptions from the assumed displacement fields as the only simplifications.

Results for bending stiffness obtained using the current developed model are compared with a three dimensional finite element solution [1] and validated using experimental results from four point bending tests, using beams with different face and core thickness relations as well as long and short span beams. Strain distributions across the thickness of the sandwich specimens are also analysed and compared.

References

1: S. Teixeira de Freitas, H. Kolstein, F. Bijlaard, "Sandwich System for Renovation of Orthotropic Steel Bridge Decks", Journal of Sandwich Structures and Materials, 13(3), 279-301, 2011.
2: A.L. Araújo, C.M. Mota Soares, C.A. Mota Soares, "Finite Element Model for Hybrid Active-Passive Damping Analysis of Anisotropic Laminated Sandwich Structures", Journal of Sandwich Structures and Materials, 12, 397-419, 2010. doi:10.1177/1099636209104534

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Front Page Browse CCP CSETS CTR IJRT Other Authors Search Purchase Guide FAQ Contact us	Civil-Comp Proceedings ISSN 1759-3433 CCP: 99 PROCEEDINGS OF THE ELEVENTH INTERNATIONAL CONFERENCE ON COMPUTATIONAL STRUCTURES TECHNOLOGY Edited by: B.H.V. Topping Paper 37 A Finite Element for Bending Analysis of Sandwich Composite Beams P. Belbute¹, A.L. Araújo¹, S. Teixeira de Freitas² and M. de Freitas³ ¹IDMEC/IST, Instituto Superior Tecnico, Technical University of Lisbon, Portugal ²Delft University of Technology, The Netherlands ³ICEMS, Instituto Superior Tecnico, Technical University of Lisbon, Portugal doi:10.4203/ccp.99.37 purchase the full-text of this paper Full Bibliographic Reference for this paper , "A Finite Element for Bending Analysis of Sandwich Composite Beams", in B.H.V. Topping, (Editor), "Proceedings of the Eleventh International Conference on Computational Structures Technology", Civil-Comp Press, Stirlingshire, UK, Paper 37, 2012. doi:10.4203/ccp.99.37 Keywords: sandwich beams, beam elements, four point bending tests, validation. Summary This paper presents a new sandwich beam finite element with transversely compressible core and laminated composite face layers. The model is intended to study the bending behaviour of sandwich beams with application to bridge decks [1]. The model is validated with experimental results conducted on several specimens of sandwich beams with steel faces and polyurethane core. A three-dimensional finite element solution is also used for comparison purposes. The sandwich beam model is based on a layerwise approach in which the core is modelled according to a higher order shear deformation theory and the composite laminated face layers are modelled using a first order shear deformation theory. The formulation follows the same approach as described in Araújo et al. [2] but with transverse compressibility of the core included. The constitutive laws for material behaviour are obtained from the three-dimensional elasticity matrices for orthotropic materials with kinematic assumptions from the assumed displacement fields as the only simplifications. Results for bending stiffness obtained using the current developed model are compared with a three dimensional finite element solution [1] and validated using experimental results from four point bending tests, using beams with different face and core thickness relations as well as long and short span beams. Strain distributions across the thickness of the sandwich specimens are also analysed and compared. References 1 S. Teixeira de Freitas, H. Kolstein, F. Bijlaard, "Sandwich System for Renovation of Orthotropic Steel Bridge Decks", Journal of Sandwich Structures and Materials, 13(3), 279-301, 2011. 2 A.L. Araújo, C.M. Mota Soares, C.A. Mota Soares, "Finite Element Model for Hybrid Active-Passive Damping Analysis of Anisotropic Laminated Sandwich Structures", Journal of Sandwich Structures and Materials, 12, 397-419, 2010. doi:10.1177/1099636209104534 purchase the full-text of this paper (price £20) go to the previous paper go to the next paper return to the table of contents return to the book description purchase this book (price £65 +P&P)
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