Journal Article

Effects of Delamination on Guided Waves in a Symmetric Laminated Composite Beam

Lee, Usik, Kim, Seungwan

2014

Overview

For successful structural health monitoring and structural integrity evaluation of a laminated composite structure, it is important to study the effects of delamination on the propagations of the guided waves in a delaminated composite beam by using an accurate and computationally efficient method. Thus, we developed a “frequency-domain” spectral element model for the symmetric composite beams. First-order-shear-deformation-theory (FSDT) based Timoshenko beam theory and Mindlin-Herrmann rod theory are adopted for the flexural (bending) waves and axial (extensional) waves, respectively. A spectral element model is derived from the governing equations of motion by using the variation method in the frequency domain. After validating the accuracy of the proposed spectral element model, the model is used to investigate the effects of delamination on the propagation of guided waves in examples of composite beams.

• Publisher: Hindawi Publishing Corporation,John Wiley & Sons, Inc
• Subject: Beam theory (structures) / Civil engineering / Composite beams / Composite materials / Composite structures / Computational efficiency / Deformation effects / Delaminating / Delamination / Equations of motion / Finite element analysis / Frequency domain analysis / Frequency variation / Laminar composites / Mathematical models / Mechanical engineering / Mindlin plates / Propagation / Spectra / Structural health monitoring / Structural integrity / Studies / Timoshenko beams / Wave propagation