Inter-Laminar Stress Analysis in Boundary Layer Region of Symmetrically Laminated Plates Under Torsion

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Jamalimehr, Amin | 2014

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 46759 (08)
University: Sharif University of Technology
Department: Mechanical Engineering
Advisor(s): Nosier, Asghar
Abstract:
In the present research an analytical solution is studied for interlaminar stresses in boundary layer region of symmetric composite laminates under torsion. Based on geometrical and physical grounds the existing displacement field in literature is simplified in order to accommodate to torsion of symmetric laminates. Displacement field is divided to global and local parts. The solution procedure consists of combined equivalent single layer theories and layerwise theory of Reddy. ESL theories are more computationally economic while LWTs are considerably accurate in determining local behavior of plate. Further, based on second order shaer deformation theory and Ritz approximate variational method, global displacement parameters are calculated for generally laminated plates under torsion and hygrothethermal loading. By comparing the results of different theories it can be concluded that ESL theories and Ritz method are very accurate in evaluating global displacement parameters. By utilizing these parameters in LWT free-edge stresses in boundary-layer region is investigated. The effect of lamination and end conditions are studied for symmetric lamintes
Keywords:
Interlaminar Stress ; Layerwise Theory ; Boundary Layer ; Equivalent Single Layer Theory ; Symmetrically Laminated

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