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Closed-form analytical solutions for thin-walled laminated composite beams with tubular and rectangular cross-sections are developed for evaluating interlaminar shear stress and thermally induced stresses. The formulations are fundamentally based on modified Composite lamination theory and parallel axis theorem. The present approach includes a variation of ply stiffness along the contour of the cross-section. Interlaminar shear stresses in cantilevered composite beams with rectangular cross-section under a transverse load is analytically determined to be independent of a temperature differential subjected to uniform temperature environment. An ANSYS based threedimensional finite element model for computing thermal stresses of both cross-sections is further demonstrated. The results obtained from analytical solutions give an excellent agreement to finite element results. This mathematical model represents an efficient tool for structural design engineers to perform parametric studies during the preliminary design phase. [ABSTRACT FROM AUTHOR]

In this study a vibration-based Delamination detection is achieved using artificial immune system (AIS) method. The approach is based upon mimicking immune recognition mechanisms that possess features such as adaptation, evolution, and immune learning. A model for determining composite beam natural frequencies evaluated. Detection accuracy and prediction errors calculated with variance account for (VAF) and mean square error (MSE) concepts and compared with different ANN methods. The proposed approach showed significantly better performance in detecting failures in comparison with the other methods. [ABSTRACT FROM PUBLISHER]