Partial Delamination Detection and Quantification in Composite Laminates Using Laser Doppler Vibrometer

Nimje, Yashdeep P and Raju, Gangadharan (2017) Partial Delamination Detection and Quantification in Composite Laminates Using Laser Doppler Vibrometer. In: First Structural Integrity Conference and Exhibition (SICE-2016), 4-6 July 2016, Bangalore, India.

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Abstract

Vibration-based structural health monitoring techniques are widely used for detection and quantification of delamination in composite structures. In this work, non-contact vibration measurement technique namely laser Doppler vibrometer (LDV) is used for damage characterization of partial delamination in composite beams. The modal information such as natural frequencies and mode shapes of composite beam are obtained using LDV and validated with finite element models for comparison with the obtained experimental results. Mode shape-based damage detection algorithms such as fractal dimension approach are used for quantification of delamination in composite beams. In the present work, a modified generalized fractal dimension technique is proposed to locate delamination of different sizes and shapes in the composite beam. Different types of partial delamination like C-type, I-type in composite beam specimens were fabricated and experimentally studied using LDV. The modified fractal dimension technique was then applied to the mode shapes results of the various partial delaminations to quantify the damage.

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