Interlaminar stresses of laminated composite beams resting on elastic foundation subjected to transverse loading

•Normal stress σz have a smooth distribution through the thickness of laminate.•Maximum value of σxz was decreased by increasing L/h aspect ratio of the beam.•Maximum value of σyz through the thickness, occurs in the middle plane of the beam.•Maximum value of σxz through the thickness of laminate oc...

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Bibliographic Details
Published in:Computational materials science 2015-01, Vol.96, p.439-447
Main Authors: Afshin, M., Taheri-Behrooz, F.
Format: Article
Language:English
Subjects:
Approximation
Boundary conditions
Composite beams
Elastic foundation
Elasticity
Elasticity solution
Foundations
Free edge effect
Interlaminar stress
Interlaminar stresses
Layerwise theory
Materials science
Mathematical models
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Summary:•Normal stress σz have a smooth distribution through the thickness of laminate.•Maximum value of σxz was decreased by increasing L/h aspect ratio of the beam.•Maximum value of σyz through the thickness, occurs in the middle plane of the beam.•Maximum value of σxz through the thickness of laminate occurs at free edge of the beam. In the present study, static analysis of the interlaminar stresses and free edge effects in a laminated composite beam resting on the Winkler-type elastic foundation is discussed. Equilibrium equations under transverse load along with the appropriate boundary conditions are obtained by using the Reddy’s layerwise theory. An approximate elasticity solution for a special case of the boundary conditions is developed to verify the validity and accuracy of the present theory. Various examples are presented for the interlaminar normal and shear stresses along the interface and through the thickness of the beam and numerical results for the free edge-clamped boundary conditions are obtained. Finally, the effect of various parameters containing the concentration of the load, stiffness of the elastic foundation and dimension aspect ratio on the interlaminar stresses is studied. Results show an excellent agreement between the layerwise theory and approximate elasticity solution and demonstrate that the magnitude of interlaminar stresses in this problem are significant and should be considered in the structural design.
ISSN:0927-0256
1879-0801
DOI:10.1016/j.commatsci.2014.06.027