The application of high-speed digital image correlation

Reu, Phillip L.; Miller, Timothy J.

doi:10.1243/03093247jsa414

Cited by 115 publications

(71 citation statements)

References 9 publications

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“…The identified properties obtained for these stages with the virtual fields mentioned in equation (15) are given in Tables 1 and 2. Although these values are not exactly the expected ones (reference values given in Tables 1 and 2), 2 it appears that the proposed approach gives access to the right order of magnitude. 3 It can be seen that the identified values of Young's modulus are generally lower than the reference ones.…”

Section: Field Nmentioning

confidence: 71%

“…They measured surface velocities up to 220 m·s −1 and acceleration of 6·10 6 m·s −2 (600,000 g) during the first 30 μs. Reu and Miller also studied the deformation of an aluminium sheet under blast loading using 3D image correlation [2]. They underlined the gap that exists between highspeed imaging and ultra high-speed imaging systems and proposed to interlace two sets of two high-speed cameras to double the frame rate without affecting the spatial resolution.…”

Section: Full-field Kinematic Measurements At High Strain Rates Usingmentioning

confidence: 99%

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Full-Field Strain Measurement and Identification of Composites Moduli at High Strain Rate with the Virtual Fields Method

et al. 2010

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. Abstract The present paper deals with full-field strain measurement on glass/epoxy composite tensile specimens submitted to high strain rate loading through a split Hopkinson pressure bar (SHPB) device and with the identification of their mechanical properties. First, the adopted methodology is presented: the device, including an Ultra-High Speed camera, and the experimental procedure to obtain relevant displacement maps are described. The different full-field results including displacement, strain and acceleration maps for two mechanical tests are then addressed. The last part of the paper deals with an original procedure to identify stiffnesses on this dynamic case only using the actual strain and acceleration maps (without the applied force) by using the Virtual Fields Method.

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Section: Field Nmentioning

confidence: 71%

Section: Full-field Kinematic Measurements At High Strain Rates Usingmentioning

confidence: 99%

Full-Field Strain Measurement and Identification of Composites Moduli at High Strain Rate with the Virtual Fields Method

et al. 2010

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“…Ultra-high speed imaging is defined in [24] in opposition to high-speed imaging where imaging rates are limited by memory read-out rates. The cameras used here rely on novel 'In-Situ Image Storage' sensors where the memory read-out limitation is alleviated by storing the electrons directly on the chip and reading the electron wells after the test.…”

Section: Experimental Set-upmentioning

confidence: 99%

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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“…Some authors have studied materials in situations where stress waves were still propagating, either to investigate the behaviour of low-impedance materials [28,29] or to provide stiffness measurements [30]. For stiff engineering materials however, imaging in this range requires the use of ultra-high speed imaging, as defined in [31], because of the very large wave speeds (several km s −1 ).…”

Section: Introductionmentioning

confidence: 99%

Beyond Hopkinson's bar

Pierron

Zhu

Siviour

2014

Phil. Trans. R. Soc. A.

122

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In order to perform experimental identification of high strain rate material models, engineers have only a very limited toolbox based on test procedures developed decades ago. The best example is the so-called split Hopkinson pressure bar based on the bar concept introduced 100 years ago by Bertram Hopkinson to measure blast pulses. The recent advent of full-field deformation measurements using imaging techniques has allowed novel approaches to be developed and exciting new testing procedures to be imagined for the first time. One can use this full-field information in conjunction with efficient numerical inverse identification tools such as the virtual fields method (VFM) to identify material parameters at high rates. The underpinning novelty is to exploit the inertial effects developed in high strain rate loading. This paper presents results from a new inertial impact test to obtain stress–strain curves at high strain rates (here, up to 3000 s −1 ). A quasi-isotropic composite specimen is equipped with a grid and images are recorded with the new HPV-X camera from Shimadzu at 5 Mfps and the SIMX16 camera from Specialised Imaging at 1 Mfps. Deformation, strain and acceleration fields are then input into the VFM to identify the stiffness parameters with unprecedented quality.

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The application of high-speed digital image correlation

Cited by 115 publications

References 9 publications

Full-Field Strain Measurement and Identification of Composites Moduli at High Strain Rate with the Virtual Fields Method

Full-Field Strain Measurement and Identification of Composites Moduli at High Strain Rate with the Virtual Fields Method

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

Beyond Hopkinson's bar

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