Analysis of dynamic bending test using ultra high speed DIC and the virtual fields method

Koohbor, Behrad; Kidane, Addis; Sutton, Michael A.; Zhao, Xing; Mallon, Silas

doi:10.1016/j.ijimpeng.2016.12.021

Cited by 33 publications

(17 citation statements)

References 28 publications

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“…Over 38 the next four years (2018 included), a total of 39 papers was published. Of 39 those, only a few [3541] did not only report displacement and/or strain elds, 40 which required additional processing when instantaneous analyses were per-41 formed. It is worth noting that uncertainty quantications were not reported Journal of Impact Engineering [20] From this short literature review, it is concluded that virtually all studies 44 used existing (and mostly commercial) DIC codes.…”

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confidence: 99%

Measurement of kinematic fields via DIC for impact engineering applications

Hild

Bouterf

Roux

2019

International Journal of Impact Engineering

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Two dynamic Brazilian tests are analyzed via digital image correlation for acquisition rates equal to 5 and 10 million frames per second. Displacements of the order of 1 mm, velocities of the order of ±250 m/s, and accelerations as high as ±4 × 10 7 m/s 2 are measured with spacetime DIC. Uncertainty quantications enable spacetime DIC to be compared with instantaneous analyses. The gains provided by the temporal regularization are very signicant for the acceleration elds. The observed levels are consistent with a priori estimates.

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confidence: 99%

Measurement of kinematic fields via DIC for impact engineering applications

Hild

Bouterf

Roux

2019

International Journal of Impact Engineering

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“…Image Correlation to Capture Dynamic Ruptures. The digital image correlation method has been successfully applied in a variety of dynamic applications [88][89][90][91][92][93][94]. However, quantifying with DIC the full-field evolution of dynamic ruptures traveling at speeds in the range of several kilometers per second (typically 1 km/s for a sub-Rayleigh rupture and up to about 2.6 km/s for a supershear rupture) has its own set of challenges, requiring a temporal acquisition on the order of 1-2 MHz, in order to capture the Fig.…”

Section: Challenges In Developing Ultrahigh-speed Digitalmentioning

confidence: 99%

Recent Milestones in Unraveling the Full-Field Structure of Dynamic Shear Cracks and Fault Ruptures in Real-Time: From Photoelasticity to Ultrahigh-Speed Digital Image Correlation

Rosakis

Rubino

Lapusta

2020

Journal of Applied Mechanics

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The last few decades have seen great achievements in dynamic fracture mechanics. Yet, it was not possible to experimentally quantify the full-field behavior of dynamic fractures, until very recently. Here, we review our recent work on the full-field quantification of the temporal evolution of dynamic shear ruptures. Our newly developed approach based on digital image correlation combined with ultrahigh-speed photography has revolutionized the capabilities of measuring highly transient phenomena and enabled addressing key questions of rupture dynamics. Recent milestones include the visualization of the complete displacement, particle velocity, strain, stress and strain rate fields near growing ruptures, capturing the evolution of dynamic friction during individual rupture growth, and the detailed study of rupture speed limits. For example, dynamic friction has been the biggest unknown controlling how frictional ruptures develop but it has been impossible, until now, to measure dynamic friction during spontaneous rupture propagation and to understand its dependence on other quantities. Our recent measurements allow, by simultaneously tracking tractions and sliding speeds on the rupturing interface, to disentangle its complex dependence on the slip, slip velocity, and on their history. In another application, we have uncovered new phenomena that could not be detected with previous methods, such as the formation of pressure shock fronts associated with “supersonic” propagation of shear ruptures in viscoelastic materials where the wave speeds are shown to depend strongly on the strain rate.

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“…Spontaneously propagating shear ruptures with the speeds in excess of 2 km/s require a minimum temporal sampling of the order of 1-2 million frames/s to capture their temporal evolution, as well as an adequate spatial sampling to resolve their features. In the last decade or so, high-speed digital image correlation applications have increased [28][29][30][31][32][33][34][35][36][37], but their development has been limited by the high-speed camera technologies available. A key requirement for the digital images to be analyzed with DIC is their low noise level [38][39][40][41][42][43].…”

Section: Introductionmentioning

confidence: 99%

“…Recent advances in high-speed camera technologies have enabled a higher number of recorded frames in the ultrahigh-speed range [44]. While the spatial resolution of these cameras is still limited, their low noise level makes them good candidates for DIC [32,35]. Ultrahigh-speed photography combined with digital image correlation tailored to capture dynamic ruptures has allowed us to discover new phenomena.…”

Section: Introductionmentioning

confidence: 99%

Full-field Ultrahigh-speed Quantification of Dynamic Shear Ruptures Using Digital Image Correlation

2019

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Producing dynamic ruptures in the laboratory allows us to study fundamental characteristics of interface dynamics. Our laboratory earthquake experimental setup has been successfully used to reproduce a number of dynamic rupture phenomena, including supershear transition, bimaterial effect, and pulse-like rupture propagation. However, previous diagnostics, based on photoelasticity and laser velocimeters, were not able to quantify the full-field behavior of dynamic ruptures and, as a consequence, many key rupture features remained obscure. Here we report on our dynamic full-field measurements of displacement, velocities, strains and strain rates associated with the spontaneous propagation of shear ruptures in the laboratory earthquake setup. These measurements are obtained by combining ultrahigh-speed photography with the digital image correlation (DIC) method, enhanced to capture displacement discontinuities. Images of dynamic shear ruptures are taken at 1-2 million frames/s over several sizes of the field of view and analyzed with DIC to produce a sequence of evolving full-field maps. The imaging area size is selected to either capture the rupture features in the far field or to focus on near-field structures, at an enhanced spatial resolution. Simultaneous velocimeter measurements on selected experiments verify the accuracy of the DIC measurements. Owing to the increased ability of our measurements to resolve the characteristic field structures of shear ruptures, we have recently been able to observe rupture dynamics at an unprecedented level of detail, including the formation of pressure and shear shock fronts in viscoelastic materials and the evolution of dynamic friction.

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Analysis of dynamic bending test using ultra high speed DIC and the virtual fields method

Cited by 33 publications

References 28 publications

Measurement of kinematic fields via DIC for impact engineering applications

Measurement of kinematic fields via DIC for impact engineering applications

Recent Milestones in Unraveling the Full-Field Structure of Dynamic Shear Cracks and Fault Ruptures in Real-Time: From Photoelasticity to Ultrahigh-Speed Digital Image Correlation

Full-field Ultrahigh-speed Quantification of Dynamic Shear Ruptures Using Digital Image Correlation

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