Location of delamination in laminated composite plates by pulsed laser holography

Akhter, Naseem; Jung, Hyun Chul; Chang, Ho-Seob; Kim, Kyeong-Suk

doi:10.1016/j.optlaseng.2008.10.003

Cited by 19 publications

(7 citation statements)

References 7 publications

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“…The basic concept of phase shifting interferometry is inserting a device (e.g., a PZT transducer) into the optical path to incorporate known phase shifts. As depicted in Figure 5, the techniques may classified into camera-based interferometry [65][66][67][68][69][70][71] and detector-based interferometry , out of which the former is limited in temporal domain resolution, whereas the latter limited in spatial domain resolution [11]. In second classification, when coupling a broadband light into the fiber, local FBG sensors using Bragg gratings as sensing elements placed within an optical fiber reflect back a narrowband signal whose peak wavelength (Bragg wavelength) depends on the grating's period and effective refractive index.…”

Section: Nde Techniquesmentioning

confidence: 99%

“…Holography: Holography as a powerful interferometric technique to measure surface displacement and vibration modes even under noisy environments is a complicated technique in terms of measurement interpretation. In this regard, the shape and location of delamination in CFRP laminate have been estimated through out-of-plane vibrational mode patterns at specific frequencies for each delamination shape measured using pulsed laser holography, emphasizing on the technique's merit, that is the reduction of the environmental noises [68]. Additionally, amplitudes of the local out-of-plane vibration modes at a specific frequency at a healthy area and delaminated area derived from heterodyne holography were applied for delamination inspection, thereby verifying delamination location with data measured by SLDV and thermography [69].…”

Section: Camera-based Interferometrymentioning

confidence: 99%

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A Survey of Scrutinizing Delaminated Composites via Various Categories of Sensing Apparatus

Askaripour

Żak

2019

J. Compos. Sci.

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Scrutinizing delaminated composites is extensively conducted based on measurements of various types of nondestructive sensing apparatus, classified herein as systems of thermographic inspection, piezoelectric inspection, optical interferometric inspection, electromagnetic testing, ultrasonic testing, and visual testing. The development of the subject has been reviewed during 2000–2017. Not only does the substantial corresponding literature strongly indicates numerous increasing industrial demand for composites, including carbon fiber-reinforced polymer, glass fiber-reinforced polymer, and fiber-reinforced metal laminate, but also the significant potential of composites to delaminate when subjected particularly to impact, machining operation or manufacturing imperfections. Conducting a study on the corresponding literature, the subject of delamination inspection within composites is found to be a dynamic, mature field, while lacking a thorough literature review. Therefore, the present study addresses the mentioned gap regarding various sensation systems utilized so as to detect internal anomalies in composites for the review arrangement. To that end, the literature inclusion in terms of citation times is electronically adopted associated with an appropriate combination of keywords. The study may be considered as a comprehensive, up-to-date review covering all delamination inspection techniques founded on sensation systems, thus benefiting the readers with information in an organized configuration.

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Section: Nde Techniquesmentioning

confidence: 99%

Section: Camera-based Interferometrymentioning

confidence: 99%

A Survey of Scrutinizing Delaminated Composites via Various Categories of Sensing Apparatus

Askaripour

Żak

2019

J. Compos. Sci.

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“…Due to the high cost of CFRP materials, non-destructive testing (NDT) methods including thermography [1e4], ultrasonic inspection [5e8], X-ray inspection [9e11], shearography [11,12], electronic speckle pattern interferometry [13,14], etc. are commonly applied.…”

Section: Introductionmentioning

confidence: 99%

Defect detection in CFRP structures using pulsed thermographic data enhanced by penalized least squares methods

Zheng

Chang

Yao

2015

Composites Part B: Engineering

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“…Todoroki et al (2002) and Iwasaki and Todoroki (2005) individually diagnosed delamination in graphite/epoxy laminates based on changes in their electric resistance, with the delamination identified correctly. Akhter et al (2009) used pulsed electronic speckle pattern interferometry (Pulsed-ESPI) to locate delamination in carbon fiberreinforced plastic laminate plates. Their results showed that the location of delamination was successfully detected.…”

Section: Introductionmentioning

confidence: 99%

Non-baseline identification of delamination in plates using wavelet-aided fractal analysis of two-dimensional mode shapes

Bai

Radzieński

Cao

et al. 2014

Journal of Intelligent Material Systems and Structures

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Delamination is a typical form of damage in composite plates. Identification of delamination in plates has been a focus of increasing research interest in relatively recent years. This study develops a new approach, termed a scale waveform dimension analysis of two-dimensional mode shapes, to identify delamination in composite plates. The scale waveform dimension analysis comprises two components: decomposition of a mode shape into scale mode shapes and waveform dimension analysis of scale mode shapes. The first component acts as a splitter that broadly splits a noisy mode shape into three sets of trend-, noise-, and damage-scale mode shapes, from which the damage scale mode shapes can be selected for use in damage characterization; the second component functions as a detector to detect abnormalities of damage scale mode shapes, to indicate the presence and location of delamination. The efficacy of the method is numerically studied and experimentally examined using composite plates containing small delamination. The results show that the proposed method can identify delamination with great accuracy in noisy conditions, needing no intact baseline mode shapes nor any prior knowledge of either the material properties or boundary conditions of the plate being inspected.

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Location of delamination in laminated composite plates by pulsed laser holography

Cited by 19 publications

References 7 publications

A Survey of Scrutinizing Delaminated Composites via Various Categories of Sensing Apparatus

A Survey of Scrutinizing Delaminated Composites via Various Categories of Sensing Apparatus

Defect detection in CFRP structures using pulsed thermographic data enhanced by penalized least squares methods

Non-baseline identification of delamination in plates using wavelet-aided fractal analysis of two-dimensional mode shapes

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