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Nonlinear elastic multi-path reciprocal method for damage localisation in composite materials

Boccardi, S., Callá, D.B., Ciampa, F. and Meo, M. (2018) Nonlinear elastic multi-path reciprocal method for damage localisation in composite materials Ultrasonics, 82. pp. 239-245.

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Nonlinear ultrasonic techniques rely on the measurement of nonlinear elastic effects caused by the interaction of ultrasonic waves with the material damage, and have shown high sensitivity to detect microcracks and defects in the early stages. This paper presents a nonlinear ultrasonic technique, here named nonlinear elastic multi-path reciprocal method, for the identification and localisation of micro-damage in composite laminates. In the proposed methodology, a sparse array of surface bonded ultrasonic transducers is used to measure the second harmonic elastic response associated with the material flaw. A reciprocal relationship of nonlinear elastic parameters evaluated from multiple transmitter-receiver pairs is then applied to locate the micro-damage. Experimental results on a damaged composite panel revealed that an accurate damage localisation was obtained using the normalised second order nonlinear parameter with a high signal-to-noise-ratio (~11.2 dB), whilst the use of bicoherence coefficient provided high localisation accuracy with a lower signal-to-noise-ratio (~1.8 dB). The maximum error between the calculated and the real damage location was nearly 13 mm. Unlike traditional linear ultrasonic techniques, the proposed nonlinear elastic multi-path reciprocal method allows detecting material damage on composite materials without a priori knowledge of the ultrasonic wave velocity nor a baseline with the undamaged component.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Mechanical Engineering Sciences
Authors :
Boccardi, S.
Callá, D.B.
Meo, M.
Date : January 2018
DOI : 10.1016/j.ultras.2017.09.001
Copyright Disclaimer : Copyright 2017 Published by Elsevier B.V.
Uncontrolled Keywords : Composite materials; Structural health monitoring (SHM); Nonlinear damage localization
Depositing User : Diane Maxfield
Date Deposited : 13 Sep 2019 15:23
Last Modified : 13 Sep 2019 15:24

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