Dr. P. J. Guruprasad Profile

Dr. P. J. Guruprasad

Assistant Professor at Indian Institute of Technology Bombay

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Proceedings Article | 10 December 2006 Paper

Modeling of active fiber composite for delamination sensing

P. Guruprasad, Ajay Kumar Tamrakar, Dineshkumar Harursampath

Proceedings Volume 6413, 641305 (2006) https://doi.org/10.1117/12.695110

KEYWORDS: Sensors, Composites, Electrodes, Actuators, Active remote sensing, Damage detection, Structural health monitoring, Mathematical modeling, Performance modeling, Piezoelectric effects

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In order to demonstrate the feasibility of Active Fiber Composites (AFC) as sensors for detecting damage, a pretwisted strip made of AFC with symmetric free-edge delamination is considered in this paper. The strain developed on the top/bottom of the strip is measured to detect and assess delamination. Variational Asymptotic Method (VAM) is used in the development of a non-classical non-linear cross sectional model of the strip. The original three dimensional (3D) problem is simplified by the decomposition into two simpler problems: a two-dimensional (2D) problem, which provides in a compact form the cross-sectional properties using VAM, and a non-linear one-dimensional (1D) problem along the length of the beam. This procedure gives the non-linear stiffnesses, which are very sensitive to damage, at any given cross-section of the strip. The developed model is used to study a special case of cantilevered laminated strip with antisymmetric layup, loaded only by an axial force at the tip. The charge generated in the AFC lamina is derived in closed form in terms of the 1D strain measures. It is observed that delamination length and location have a definite influence on the charge developed in the AFC lamina. Also, sensor voltage output distribution along the length of the beam is obtained using evenly distributed electrode strip. These data could in turn be used to detect the presence of damage.

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