Automated fringe pattern analysis in experimental mechanics: A review

Huntley, Jonathan M.

doi:10.1243/0309324981512850

Cited by 108 publications

(48 citation statements)

References 100 publications

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“…These relations are related to changes in the optical path of light reflected from the surface. [18] By phase unwrapping and scaling [19,20] it is possible to measure displacements as small as 25 nm along three orthogonal axes induced by deformation. Measurements of multiple points on the surface yield X, Y, and Z displacement maps (see the Experimental [13] ).…”

Section: Introductionmentioning

confidence: 99%

Relations Between Shape, Materials Properties, and Function in Biological Materials Using Laser Speckle Interferometry: In situ Tooth Deformation

et al. 2006

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The manner in which stiff biological objects, such as whole bones and teeth, deform under load can provide direct insight into their in vivo functions, while highlighting the relations between their structure and materials properties. A new approach for studying the mechanical functions of such objects, using as an example the crowns of human teeth, is developed. Tooth‐crown deformation under a compressive load is determined in water using laser speckle interferometry. The deformation patterns are analyzed using a novel procedure that reveals the relative magnitudes of 3D displacements of the outer surface. Nanometer‐scale deformations of natural teeth were compared to deformations of identical acrylic replicas, in order to differentiate between contributions of the structure–material properties from contributions of morphology. It is shown that human premolars deform in a manner that is largely controlled by shape; in natural teeth, the enamel cap appears to displace mainly as a rigid body, undergoing moderate deformation. These observations contribute to the understanding of whole‐tooth performance under load. The approach for analyzing the deformation of loaded whole objects is directly applicable to the study of many stiff biological specimens, including comparisons between normal and altered (repaired or genetically modified) bones.

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Section: Introductionmentioning

confidence: 99%

Relations Between Shape, Materials Properties, and Function in Biological Materials Using Laser Speckle Interferometry: In situ Tooth Deformation

et al. 2006

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“…There are several methods for unwrapping periodic data but these are not included here. 19 The periodic maps of the characteristic parameters for the simulated three-dimensional stress field are shown in Fig. 6.…”

Section: Discussionmentioning

confidence: 99%

The use of phase-stepping for the measurement of characteristic parameters in integrated photoelasticity

Tomlinson

Patterson

2002

Experimental Mechanics

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ABSTRACT--A three-dimensional photoelastic body can be represented by an optically equivalent model, which consists of a linear retarder, 5, at a certain angle, 0, and a pure rotator, X. These have been described as the characteristic retardation, ~, and the primary and secondary characteristic directions, 0 and 0+X. Until now these characteristic parameters have only been determined using manual, point-by-point collection methods which are involved and time consuming. Therefore an automated phase-stepping method has been developed to enable the determination of the three characteristic parameters for three-dimensional or integrated photoelasticity. Expressions have been derived to obtain 3, 0 and 0 4-7, from six phase-stepped images. These images are collected using a CCD camera and the full-field data is processed using a standard personal computer. This novel method allows accurate, full-field maps of all three characteristic parameters to be obtained in a relatively short time, which makes full-field tomographic reconstruction of photoelastic data a real possibility.

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“…To address this issue, the displacement elds were computed between two images taken with the same sensor: one static reference image and the actual dynamic one. The displacement computation is based on the phase shift between the reference and deformed images [33]. In this study, a windowed discrete Fourier transform (WDFT) algorithm was used [34,35,42,43].…”

Section: Methodsmentioning

confidence: 99%

Identification of the Dynamic Properties of Al 5456 FSW Welds Using the Virtual Fields Method

Louëdec

Pierron

Sutton

et al. 2015

J. dynamic behavior mater.

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The present study focuses on the identication of the evolution of the dynamic elasto-plastic properties of Al 5456 FSW welds. An innovative method is proposed to make best use of the data collected with full-eld measurements during dynamic experiments, and achieve identication of the mechanical properties of heterogeneous materials without requiring measurement of the load. Compressive specimens have been submitted to high strain-rate loading through a Split Hopkinson Pressure Bar (SHPB) device while displacement elds were measured using full-eld measurement techniques. Two sets of experiments have been performed using two dierent methods: the Grid Method and Digital Image Correlation. Afterwards, the identication of the elastic and plastic properties of the material was carried out using the Virtual Fields Method. Finally, identication of the evolution of the yield stress throughout the weld has been achieved for strain-rates of the order of 10 3 s −1 .

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Automated fringe pattern analysis in experimental mechanics: A review

Cited by 108 publications

References 100 publications

Relations Between Shape, Materials Properties, and Function in Biological Materials Using Laser Speckle Interferometry: In situ Tooth Deformation

Relations Between Shape, Materials Properties, and Function in Biological Materials Using Laser Speckle Interferometry: In situ Tooth Deformation

The use of phase-stepping for the measurement of characteristic parameters in integrated photoelasticity

Identification of the Dynamic Properties of Al 5456 FSW Welds Using the Virtual Fields Method

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