Damage detection in composite materials using deflectometry, a full-field slope measurement technique

Devivier, C.; Pierron, Fabrice; Wisnom, Michael R

doi:10.1016/j.compositesa.2011.11.009

Cited by 42 publications

(25 citation statements)

References 51 publications

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“…Scanning laser Doppler vibrometry provides similar data to the technique proposed here as long as the excitation and response are stable over a prolonged period of time. However, the scan time is generally long and the spatial resolution is typically limited to a few hundred data points for a reasonable scan time, which is not enough to capture local strain concentrations arising from the presence of defects, as seen for instance on delaminated plates [13,14]. Finally, it is unsuited for capturing transient data.…”

Section: Introductionmentioning

confidence: 99%

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Time-resolved full-field imaging of ultrasonic Lamb waves using deflectometry

et al. 2015

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This pioneering experimental work is a proof of concept in which ultrasonic flexural waves have been imaged in a spatially and temporally resolved manner. Thin vibrating plates made of mirror glass and carbon/epoxy composite have been used in the experiments. Results obtained via a standard approach (scanning laser Doppler vibrometry) and the novel methodology based on deflectometry have been compared with a multi-physics finite element simulation. There is a very good correlation between the two experimental techniques. The numerical model provides insight into the experiments, but differs in its detailed structure due to uncertainties over material properties. The extreme slope resolution of deflectometry allows the measurement of peak-to-peak deflections of a few tens of nanometres in one shot. The use of an ultra-high speed camera allows for both space and time resolved measurements of Lamb waves which, to the best knowledge of the authors, has never been reported before. The limitations of the technique arise from the need for a flat specularly reflective surface. However, coating is possible for non-reflective materials and extension to moderately curved surfaces is possible in the future.

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Section: Introductionmentioning

confidence: 99%

“…The method adopted here is the grid method in deflectometry [13,[17][18][19]. It provides spatially and temporally resolved surface slope maps by tracking the reflection of a regular grid pattern on the bent sample.…”

Section: Introductionmentioning

confidence: 99%

Time-resolved full-field imaging of ultrasonic Lamb waves using deflectometry

et al. 2015

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“…In the literature, these data have already been used for the analysis of composites degradation. For instance, kinematic fields are employed for the study of damageinduced displacement/strain heterogeneities [11,12]; examination of thermal fields and heat dissipation allows a non-destructive evaluation of internal defects and the monitoring of damage initiation and propagation [13,14]; the knowledge of the volume density distribution finally provides the debonding zones within the material [15,16]. Yet, in the context of polymeric composite materials, each family of full-field data still remains used separately from the other.…”

Section: Introductionmentioning

confidence: 99%

Damage investigation in CFRP composites using full-field measurement techniques: Combination of digital image stereo-correlation, infrared thermography and X-ray tomography

Goidescu¹,

Welemane²,

Girard³

et al. 2013

Composites Part B: Engineering

141

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“…The local last squares fitting method to calculate the true strain field in presence of holes or crack areas has been investigated in [30] while the detection of strain singularity due to artificial delamination by using the DIC technique has been considered in [31,32]. The DIC technique has been used to study the crack growth behavior in [33], the impact induced damage in composite structures under compressive load in [34], and finally, holes in composite laminates and the bonded repairs performance also under tensile load in [35].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Delamination Growth in Composite Laminates under a Compressive Load

Riccio

Cristiano

Mezzacapo

et al. 2017

Advances in Materials Science and Engineering

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This paper focuses on the use of no-contact experimental techniques for monitoring the interlaminar damage evolution in composite laminates. Indeed, Infrared Thermography and Digital Image Correlation are adopted to investigate, in composite plates with artificial delamination, the influence of the delamination initial position on the delamination growth. The paper also investigates the feasibility of using a no-contact experimental technique for the measurement of displacement and strain during mechanical tests, such as the Digital Image Correlation, to evaluate, by means of indirect measurements, the delamination growth as a function of the applied load.

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Damage detection in composite materials using deflectometry, a full-field slope measurement technique

Cited by 42 publications

References 51 publications

Time-resolved full-field imaging of ultrasonic Lamb waves using deflectometry

Time-resolved full-field imaging of ultrasonic Lamb waves using deflectometry

Damage investigation in CFRP composites using full-field measurement techniques: Combination of digital image stereo-correlation, infrared thermography and X-ray tomography

Experimental Investigation of Delamination Growth in Composite Laminates under a Compressive Load

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