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Damage Localization Based on Modal Response Measured with Shearography

2018; Imperial College Press; Linguagem: Inglês

10.1142/9781786344977_0005

2044-9283

J.V. Araújo dos Santos, H. Lopes,

Industrial Vision Systems and Defect Detection

Computational and Experimental Methods in StructuresVibration-Based Techniques for Damage Detection and Localization in Engineering Structures, pp. 141-172 (2018) No AccessChapter 5: Damage Localization Based on Modal Response Measured with ShearographyJ. V. Araújo dos Santos and H. LopesJ. V. Araújo dos SantosIDMEC, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal and H. LopesDEM, ISEP, Instituto Politécnico do Porto, Rua Dr. António Bernardino de Almeida, 431, 4249-015 Porto, Portugalhttps://doi.org/10.1142/9781786344977_0005Cited by:4 PreviousNext AboutSectionsPDF/EPUB ToolsAdd to favoritesDownload CitationsTrack CitationsRecommend to Library ShareShare onFacebookTwitterLinked InRedditEmail Abstract: This chapter describes the application of shearography, which is a non-contact, full-field, and high-resolution optical method, for the measurement of modal response of beams and plates and subsequent damage localization. A review of literature on shearography and related interferometric techniques for vibration analysis is also presented. Since shearography is based on speckle interferometry, the physical and mathematical bases of speckle phenomenon and wave interference are described. The main techniques available to evaluate the phase maps obtained from the speckle patterns are considered and illustrated. Different processes of filtering and unwrapping the phase maps, which must be carried out in order to obtain the gradients of the modal displacement fields and thus the modal rotation field, are also presented in this chapter. Case studies of damage localization using measurements of modal response with two distinct shearography systems are also reported and discussed. Both single and multiple damages in aluminum beams are created using a saw or a milling machine. In order to test the accuracy and effectiveness of the damage localization approach, several amounts of damages are considered. It is found out that very small damage can be localized using higher order derivatives of the mode shapes, namely the fourth order. Keywords: Damage localizationModal responseShearographySpeckle interferometryModal rotation fieldContactless measurementElectronic speckle pattern interferometry (ESPI)Modal curvature fieldPhase mapsTemporal phase shifting FiguresReferencesRelatedDetailsCited By 4Application of cubic spline interpolation with optimal spatial sampling for damage identificationL. Pedroso, A. Arco, I. Figueiras, J. V. Araújo dos Santos and J. L. M. Fernandes et al.26 September 2021 | Structural Control and Health Monitoring, Vol. 29, No. 1Vibration-Based Damage Identification Using Wavelet Transform and a Numerical Model of ShearographyJ. V. Araujo dos Santos, A. Katunin, and H. Lopes9 April 2019 | International Journal of Structural Stability and Dynamics, Vol. 19, No. 04Numerical study on damage identification using shearography with different shearing amountsJ.V. Araújo dos Santos, H. Lopes and P. Moreno-García1 Jan 2017 | Procedia Structural Integrity, Vol. 5Influence of shearing amount and vibration amplitude on noise in shearographyH. Lopes, J.V. Araújo dos Santos, P. Moreno-García and J. Monteiro1 Jan 2017 | Procedia Structural Integrity, Vol. 5 Vibration-Based Techniques for Damage Detection and Localization in Engineering StructuresMetrics History KeywordsDamage localizationModal responseShearographySpeckle interferometryModal rotation fieldContactless measurementElectronic speckle pattern interferometry (ESPI)Modal curvature fieldPhase mapsTemporal phase shiftingPDF download