Wave propagation in a porous composite beam: Porosity determination, location and quantification

Ajith, V and Gopalakrishnan, S (2013) Wave propagation in a porous composite beam: Porosity determination, location and quantification. In: INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES, 50 (3-4). pp. 556-569.

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Abstract

A wave-based method is developed to quantify the defect due to porosity and also to locate the porous regions, in a composite beam-type structure. Wave propagation problem for a porous laminated composite beam is modeled using spectral finite element method (SFEM), based on the modified rule of mixture approach, which is used to include the effect of porosity on the stiffness and density of the composite beam structure. The material properties are obtained from the modified rule of mixture model, which are used in a conventional SFEM to develop a new model for solving wave propagation problems in porous laminated composite beam. The influence of the porosity content on the group speed and also the effect of variation in theses parameters on the time responses are studied first, in the forward problem. The change in the time responses with the change in the porosity of the structure is used as a parameter to find the porosity content in a composite beam. The actual measured response from a structure and the numerically obtained time responses are used for the estimation of porosity, by solving a nonlinear optimization problem. The effect of the length of the porous region (in the propagation direction), on the time responses, is studied. The damage force indicator technique is used to locate the porous region in a beam and also to find its length, using the measured wave propagation responses. (C) 2012 Elsevier Ltd. All rights reserved.

Item Type:	Journal Article
Publication:	INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
Publisher:	PERGAMON-ELSEVIER SCIENCE LTD
Additional Information:	Copyright for this article belongs to PERGAMON-ELSEVIER SCIENCE LTD, ENGLAND
Keywords:	Porosity;Wave propagation;SFEM;Laminated composite beam
Department/Centre:	Division of Mechanical Sciences > Aerospace Engineering(Formerly Aeronautical Engineering)
Date Deposited:	06 Mar 2013 11:03
Last Modified:	06 Mar 2013 11:03
URI:	http://eprints.iisc.ac.in/id/eprint/45944

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