Damage methodology approach on a composite panel based on a combination of Fringe Projection and 2D Digital Image Correlation

Felipe-Sesé, Luis; Díaz, Francisco

doi:10.1016/j.ymssp.2017.09.002

Cited by 35 publications

(12 citation statements)

References 54 publications

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“…The characterization of full-field mode shapes and operational deflection shapes (ODS) is one of the most interesting features using HS 3D-DIC. Sinusoidal signals whose frequency corresponds to a resonance of the system is employed for this purpose [ 11 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 ]. Besides, employing a broadband excitation instead of a fixed sine the full-field response of the specimen is registered, and frequency response functions (FRF) or other frequency domain transfer function are easily obtained.…”

Section: Introductionmentioning

confidence: 99%

“…By analyzing the peaks that maximize the response it is possible to estimate the natural frequencies and the damping ratios [ 12 , 13 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 ]. Special interest presents those studies that employ image decomposition approaches [ 17 , 18 , 22 , 25 , 32 , 33 ] to reduce the full-field information to just a few shape descriptors [ 34 , 35 , 36 , 37 ]. In these works, it was demonstrated that HS 3D-DIC is valid for different materials, such as steel, aluminum, composites, and polymers.…”

Section: Introductionmentioning

confidence: 99%

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Modal Parameters Evaluation in a Full-Scale Aircraft Demonstrator under Different Environmental Conditions Using HS 3D-DIC

et al. 2018

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In real aircraft structures the comfort and the occupational performance of crewmembers and passengers are affected by the presence of noise. In this sense, special attention is focused on mechanical and material design for isolation and vibration control. Experimental characterization and, in particular, experimental modal analysis, provides information for adequate cabin noise control. Traditional sensors employed in the aircraft industry for this purpose are invasive and provide a low spatial resolution. This paper presents a methodology for experimental modal characterization of a front fuselage full-scale demonstrator using high-speed 3D digital image correlation, which is non-invasive, ensuring that the structural response is unperturbed by the instrumentation mass. Specifically, full-field measurements on the passenger window area were conducted when the structure was excited using an electrodynamic shaker. The spectral analysis of the measured time-domain displacements made it possible to identify natural frequencies and full-field operational deflection shapes. Changes in the modal parameters due to cabin pressurization and the behavior of different local structural modifications were assessed using this methodology. The proposed full-field methodology allowed the characterization of relevant dynamic response patterns, complementing the capabilities provided by accelerometers.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modal Parameters Evaluation in a Full-Scale Aircraft Demonstrator under Different Environmental Conditions Using HS 3D-DIC

et al. 2018

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“…To sum up, cameras equipped with silicon detectors are usually operating in the visible spectrum (0.4-0.7 μm), and widely used to perform real-time observation of the kinematic fields, mainly thanks to digital image correlation or interferometry [21][22][23][24][25][26][27]. The silicon-based cameras are also operating in near infrared spectrum (0.7-1.1 μm) [28,29].…”

Section: Introductionmentioning

confidence: 99%

An innovative technique for real-time adjusting exposure time of silicon-based camera to get stable gray level images with temperature evolution

Zhang

Marty

Maynadier

et al. 2019

Mechanical Systems and Signal Processing

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Silicon-based sensor cameras are known to be sensitive in the near infrared spectral range, in which a small temperature variation leads to a large modification in the image gray level. It induces acquired images with local saturation or poor dynamic range of gray levels. In order to address this problem, the present study proposes an innovative technique to precisely and automatically adjust the exposure time to obtain stable gray level images when the temperature evolution occurs on the surface of the observed object. Two algorithms, including linear algorithm and Planck's algorithm, are proposed to predict the exposure time to obtain stable gray level images. Blackbody heating experiment is conducted to validate the accuracy of these two algorithms, and the result indicates that stable gray level images can be obtained using Planck's algorithm. Moreover, this technique is applied to the specimen heating experiment, and the stable gray level images can also be obtained using Planck's algorithm. These two experimental results prove that the technique is effective and reliable. Finally, the thermal fields are reconstructed on images of blackbody.

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“…The result is a simple 3D measurement system with a spatial resolution comparable to commercial 3D-DIC. Actually, this methodology has been successfully applied to different static or dynamic tests of different size of specimens [ 39 , 43 , 44 ].…”

Section: Introductionmentioning

confidence: 99%

RGB Colour Encoding Improvement for Three-Dimensional Shapes and Displacement Measurement Using the Integration of Fringe Projection and Digital Image Correlation

Felipe-Sesé

Molina-Viedma

López‐Alba

et al. 2018

Sensors

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Three-dimensional digital image correlation (3D-DIC) has become the most popular full-field optical technique for measuring 3D shapes and displacements in experimental mechanics. The integration of fringe projection (FP) and two-dimensional digital image correlation (FP + DIC) has been recently established as an intelligent low-cost alternative to 3D-DIC, overcoming the drawbacks of a stereoscopic system. Its experimentation is based on the colour encoding of the characterized fringe and speckle patterns required for FP and DIC implementation, respectively. In the present work, innovations in experimentation using FP + DIC for more accurate results are presented. Specifically, they are based on the improvement of the colour pattern encoding. To achieve this, in this work, a multisensor camera and/or laser structural illumination were employed. Both alternatives are analysed and evaluated. Results show that improvements both in three-dimensional and in-plane displacement are obtained with the proposed alternatives. Nonetheless, multisensor high-speed cameras are uncommon, and laser structural illumination is established as an important improvement when low uncertainty is required for 2D-displacement measurement. Hence, the uncertainty has been demonstrated to be reduced by up to 50% compared with results obtained in previous experimental approaches of FP + DIC.

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Damage methodology approach on a composite panel based on a combination of Fringe Projection and 2D Digital Image Correlation

Cited by 35 publications

References 54 publications

Modal Parameters Evaluation in a Full-Scale Aircraft Demonstrator under Different Environmental Conditions Using HS 3D-DIC

Modal Parameters Evaluation in a Full-Scale Aircraft Demonstrator under Different Environmental Conditions Using HS 3D-DIC

An innovative technique for real-time adjusting exposure time of silicon-based camera to get stable gray level images with temperature evolution

RGB Colour Encoding Improvement for Three-Dimensional Shapes and Displacement Measurement Using the Integration of Fringe Projection and Digital Image Correlation

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