The presence of a delamination in a bidimensional structure causes a discontinuity in the smoothness of the mode shapes on the perimeter of the damaged area. On this basis, in this paper, a numerical method proposed by the authors for detecting discontinuities in the first derivative of a smooth piecewise function, based on a Gaussian process regression (GPR) approach, has been applied to the problem of delamination localisation in multilayered composite plates. Using the finite-element method, the mode shapes of a multilayered composite plate with a delamination are calculated and used as input data for the damage localisation procedure. The performance of the approach are analysed for different sizes and through-the-thickness positions of the damage. Furthermore the problem of ‘boundary disturbance’, the erroneous indication that a fault is present near the edge of the plate exhibited when applying the GPR approach to bi-dimensional structures, is addressed using an extrapolation procedure. The effect of noise is also investigated in order to demonstrate the effectiveness and the versatility of the method in localising delaminations.

Damage localisation in delaminated composite plates using a Gaussian process approach / Corrado, Nicolò; Gherlone, Marco; Surace, Cecilia; Hensman, JAMES JOHN; Durrande, Nicolas. - In: MECCANICA. - ISSN 0025-6455. - STAMPA. - 50:10(2015), pp. 2537-2546. [10.1007/s11012-015-0193-1]

Damage localisation in delaminated composite plates using a Gaussian process approach

GHERLONE, Marco;SURACE, Cecilia;HENSMAN, JAMES JOHN;
2015

Abstract

The presence of a delamination in a bidimensional structure causes a discontinuity in the smoothness of the mode shapes on the perimeter of the damaged area. On this basis, in this paper, a numerical method proposed by the authors for detecting discontinuities in the first derivative of a smooth piecewise function, based on a Gaussian process regression (GPR) approach, has been applied to the problem of delamination localisation in multilayered composite plates. Using the finite-element method, the mode shapes of a multilayered composite plate with a delamination are calculated and used as input data for the damage localisation procedure. The performance of the approach are analysed for different sizes and through-the-thickness positions of the damage. Furthermore the problem of ‘boundary disturbance’, the erroneous indication that a fault is present near the edge of the plate exhibited when applying the GPR approach to bi-dimensional structures, is addressed using an extrapolation procedure. The effect of noise is also investigated in order to demonstrate the effectiveness and the versatility of the method in localising delaminations.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11583/2620111
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