Nimje, Yashdeep
(2016)
Partial delamination detection and quantification in composite laminates using Laser Doppler Vibrometer.
Masters thesis, Indian Institute of Technology Hyderabad.
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 namely, fractal dimension approach is 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 usingLDV. The modified fractal dimension technique was then applied to the mode shapes results of the various partial delamination to quantify the damage. In addition, multiple delamination were introduced in composite plates and experiments were carried out using LDV. Modified fractal dimension technique was then applied to quantify the delamination in composite laminates.
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