The problem of non-destructively detecting delamination in laminated composite plates is addressed in this article. As the presence of a delamination causes a discontinuity in the first derivative of the mode shapes, a numerical method for detecting discontinuities in smooth piecewise functions and their derivatives, based on a polynomial-annihilation technique, has been proposed and applied to the problem of damage detection and localisation in plate-like structures for which only post-damage mode shapes are available. Mode shapes of the test structure can be obtained by measuring the dynamic response on a regular grid of points on the surface of the plate. In this study, numerical simulations have been performed using the FE method of the dynamic behaviour of orthotropic multilayered composite plates with delaminations; two cases have been analysed in which the delamination considered is between different layers of the composite plate. Results indicate that further development of the technique for non-destructive testing of composite structures would be highly worthwhile.

Using the Polynomial Annihilation Edge Detection for locating delamination in laminated composite plates / Surace, Cecilia; Darwich, E.; Gherlone, Marco. - (2013). (Intervento presentato al convegno V International Conference on Structural Engineering, Mechanics and Computation tenutosi a Cape Town, South Africa nel September 2 - 4, 2013).

Using the Polynomial Annihilation Edge Detection for locating delamination in laminated composite plates

SURACE, Cecilia;GHERLONE, Marco
2013

Abstract

The problem of non-destructively detecting delamination in laminated composite plates is addressed in this article. As the presence of a delamination causes a discontinuity in the first derivative of the mode shapes, a numerical method for detecting discontinuities in smooth piecewise functions and their derivatives, based on a polynomial-annihilation technique, has been proposed and applied to the problem of damage detection and localisation in plate-like structures for which only post-damage mode shapes are available. Mode shapes of the test structure can be obtained by measuring the dynamic response on a regular grid of points on the surface of the plate. In this study, numerical simulations have been performed using the FE method of the dynamic behaviour of orthotropic multilayered composite plates with delaminations; two cases have been analysed in which the delamination considered is between different layers of the composite plate. Results indicate that further development of the technique for non-destructive testing of composite structures would be highly worthwhile.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11583/2515119
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