This Article Full Text (PDF) References Alert me when this article is cited Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Alert me to new issues of the journal Add to Saved Citations Download to citation manager Request Permissions Request Reprints Add to My Marked Citations Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Citing Articles via Scopus Google Scholar Articles by Nag, A. Articles by Gopalakrishnan, S. Search for Related Content Social Bookmarking                         What's this?

Identification of Delamination in a Composite Beam Using a Damaged Spectral Element

AR & DB Center of Excellence for Composite Structures Technology (ACECOST), Department of Aerospace Engineering, Indian Institute of Science, Bangalore 560 012, India

D. Roy Mahapatra

AR & DB Center of Excellence for Composite Structures Technology (ACECOST), Department of Aerospace Engineering, Indian Institute of Science, Bangalore 560 012, India

S. Gopalakrishnan

AR & DB Center of Excellence for Composite Structures Technology (ACECOST), Department of Aerospace Engineering, Indian Institute of Science, Bangalore 560 012, India, krishnan{at}aero.iisc.ernet.in

An identification procedure and sensitivity studies on single and multiple delaminations in laminated composite beams are presented. A Spectral Finite Element Model (SEM) based on the Fast Fourier Transform (FFT) is employed. A single damaged spectral element is used to model a uniform composite beam segment with a single delamination, irrespective of its length, by only specifying the delamination location and size. A damage force indicator is used to stimulate the identification procedure. In a realistic identification task, the advantage of the proposed procedure is that only two measurement nodes are sufficient as opposed to several measurement nodes in a standard finite element model with a single delamination. For multiple delaminations, the computation time to perform the identification task shows cubic polynomial complexity and hence is tractable for health monitoring of large skeletal structures. Sensitivity of a damage force indicator with respect to variations in delamination location and size is also presented. The analysis efficiently identifies the severity of delaminated configurations through the damage force indicator. This basic information can be useful in choosing optimal measurement points and the discretized structural model to minimize redundancy in the presence of several other factors such as high noise to signal ratio, damping etc. Conclusions are made on many important issues, which can be addressed with further development based on this preliminary work.

Key Words: waveguide • composite beam • delamination • damaged spectral element • damage force indicator • identification

Structural Health Monitoring, Vol. 1, No. 1, 105-126 (2002)
DOI: 10.1177/147592170200100107


CiteULike    Complore    Connotea    Del.icio.us    Digg    Reddit    Technorati    Twitter    What's this?

This article has been cited by other articles:

				D. S. Kumar, D. R. Mahapatra, and S. Gopalakrishnan Estimation of Dynamic Fracture Parameters in a Transverse Cracked Composite Beam using a Simplified Diagnostic Wave Propagation Model Structural Health Monitoring, June 1, 2006; 5(2): 99 - 124. [Abstract] [PDF]

				E. Saidha, G. N. Naik, and S. Gopalkrishnan An Experimental Investigation of a Smart Laminated Composite Beam with a Magnetostrictive Patch for Health Monitoring Applications Structural Health Monitoring, December 1, 2003; 2(4): 273 - 292. [Abstract] [PDF]