Assessment of the excitelet algorithm for in-situ mechanical characterization of orthotropic structures

Pierre-Claude Ostiguy; Nicolas Quaegebeur; Patrice Masson

doi:10.1117/12.914842

18 April 2012 Assessment of the excitelet algorithm for in-situ mechanical characterization of orthotropic structures

Pierre-Claude Ostiguy, Nicolas Quaegebeur, Patrice Masson

Proceedings Volume 8348, Health Monitoring of Structural and Biological Systems 2012; 83480N (2012) https://doi.org/10.1117/12.914842
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2012, San Diego, California, United States

Abstract

Damage detection and localization on composites can be impaired by inaccurate knowledge of the mechanical properties of the structure. This paper demonstrates the feasibility of using a chirplet-based correlation technique, called Excitelet, to evaluate the mechanical properties of orthotropic carbon fibre-based composite laminates. The method relies on the identification of an optimal correlation coefficient between measured and simulated dispersed signals measured on a structure using piezoceramic (PZT) transducers. Finite Element Model (FEM) is first conducted to demonstrate the capability of the approach to evaluate the mechanical properties of a composite structure. Experimental validation is then conducted on a unidirectionnal 2.30 mm thick laminate composed of unidirectional plies and a 2.35 mm thick laminate composed of unidirectional plies oriented at [0, 90]_4s. Surface bonded PZT transducers were used both for actuation and sensing of guided waves bursts measured at 0° and 90° with respect to upper ply fibre orientation. The characterization is performed at various frequencies below 100 kHz using A₀ or S₀ modes and comparison with the material properties measured following ASTM standard testing is presented. The results indicate that large correlation coefficients are obtained between the measurements and simulated signals for both A₀ and S₀ modes when accurate properties are used as inputs for the model. Strategies based on multiple modes correlation are also assessed in order to improve the accuracy of the characterization approach. The results obtained using the proposed approach for the unidirectional plate and most of the results obtained using the proposed approach for the [0, 90]_4s laminate are in agreement with the uncertainty associated with ASTM tests results while the proposed method is non destructive and can be performed prior to each imaging processing.

Citation Download Citation

Pierre-Claude Ostiguy, Nicolas Quaegebeur, and Patrice Masson "Assessment of the excitelet algorithm for in-situ mechanical characterization of orthotropic structures", Proc. SPIE 8348, Health Monitoring of Structural and Biological Systems 2012, 83480N (18 April 2012); https://doi.org/10.1117/12.914842

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