Journal ArticleDOI
Two-dimensional digital image correlation for in-plane displacement and strain measurement: a review
TLDR
In this article, a review of the 2D digital image correlation (2D DIC) technique for displacement field measurement and strain field estimation is presented, and detailed analyses of the measurement accuracy considering the influences of both experimental conditions and algorithm details are provided.Abstract:
As a practical and effective tool for quantitative in-plane deformation measurement of a planar object surface, two-dimensional digital image correlation (2D DIC) is now widely accepted and commonly used in the field of experimental mechanics. It directly provides full-field displacements to sub-pixel accuracy and full-field strains by comparing the digital images of a test object surface acquired before and after deformation. In this review, methodologies of the 2D DIC technique for displacement field measurement and strain field estimation are systematically reviewed and discussed. Detailed analyses of the measurement accuracy considering the influences of both experimental conditions and algorithm details are provided. Measures for achieving high accuracy deformation measurement using the 2D DIC technique are also recommended. Since microscale and nanoscale deformation measurement can easily be realized by combining the 2D DIC technique with high-spatial-resolution microscopes, the 2D DIC technique should find more applications in broad areas.read more
Citations
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Journal ArticleDOI
Microstructure and Mechanical Properties of High-Entropy Alloy Co20Cr26Fe20Mn20Ni14 Processed by High-Pressure Torsion at 77 K and 300 K.
Jongun Moon,Yuanshen Qi,Elena D. Tabachnikova,Yuri Estrin,Won Mi Choi,Soo Hyun Joo,Byeong-Joo Lee,A. V. Podolskiy,M.A. Tikhonovsky,Hyoung Seop Kim +9 more
TL;DR: The mechanical characteristics of high-entropy alloy Co20Cr26Fe20Mn20Ni14 with low-stacking fault energy processed by cryogenic and room temperature high-pressure torsion (HPT) were studied.
Journal ArticleDOI
Decoding of facial strains via conformable piezoelectric interfaces.
Tao Sun,Farita Tasnim,Rachel T. McIntosh,Nikta Amiri,Dana Solav,Dana Solav,Mostafa Tavakkoli Anbarani,David Sadat,Lin Zhang,Yuandong Gu,M. Amin Karami,Canan Dagdeviren +11 more
TL;DR: In healthy individuals and in patients with amyotrophic lateral sclerosis, it is shown that the piezoelectric thin films, coupled with algorithms for the real-time detection and classification of distinct skin-deformation signatures, enable the reliable decoding of facial movements.
Journal ArticleDOI
Mapping deformation in small-scale testing
TL;DR: In this paper, the deformation associated with crystallographic slip and with the lattice rotation was determined in a copper micropillar oriented for single slip, in areas as small as 0.16×-0.16μm 2.
Journal ArticleDOI
Low cost volcano deformation monitoring: optical strain measurement and application to Mount St. Helens data
TL;DR: In this paper, an innovative method of volcano deformation measurements, applied to camera images taken from the 2004-2008 eruption period at Mount St. Helens, is described, which highlights the strengths of camera strain monitoring, and illustrates that dome growth and collapse is a very dynamic process complexly interplaying with the surrounding.
Journal ArticleDOI
Mechanical properties and crack evolution of double-layer composite rock-like specimens with two parallel fissures under uniaxial compression
TL;DR: In this article, a large number of two-layer composite rock-like specimens composed of different combinations of materials and containing two parallel fissures with 30°, 45° or 60° fissure angles were manufactured and carried out a series of uniaxial compression tests.
References
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TL;DR: In this article, an analysis of moving least squares (m.l.s.) methods for smoothing and interpolating scattered data is presented, in particular theorems concerning the smoothness of interpolants and the description of m. l.s. processes as projection methods.
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Applications of digital-image-correlation techniques to experimental mechanics
Journal ArticleDOI
Digital Particle Image Velocimetry
Christian Willert,Morteza Gharib +1 more
TL;DR: In this article, the directional ambiguity associated with PIV and LSV is resolved by implementing local spatial cross-correlations between two sequential single-exposed particle images, and the recovered velocity data are used to compute the spatial and temporal vorticity distribution and the circulation of the vortex ring.
Journal ArticleDOI
Digital Imaging Techniques In Experimental Stress Analysis
W. H. Peters,W. F. Ranson +1 more
TL;DR: In this paper, the surface displacement components in laser speckle metrology were measured using a digital image scanner interfaced to a computer. Butt et al. used a boundary integral equation method to calculate surface traction in the contour.
Journal ArticleDOI
Digital image correlation using Newton-Raphson method of partial differential correction
TL;DR: In this paper, the authors developed and limited experimental verification of a method which can determine displacements and gradients using the Newton-Raphson method of partial corrections, which was shown to be accurate in determining displacement and certain gradients, while using significantly less CPU time than the current coarse-fine search method.