Relevant bibliographies by topics / Surface strain measurement

Academic literature on the topic 'Surface strain measurement'

Author: Grafiati
Published: 10 December 2022
Last updated: 29 January 2023

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Journal articles on the topic "Surface strain measurement"

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Butcher, Emily, Andrew Gibson, Philip M. Benson, Nick Koor, and Gareth Swift. "Near infrared spectroscopic measurement of strain in rocks." Journal of Near Infrared Spectroscopy 27, no. 6 (August 28, 2019): 432–40. http://dx.doi.org/10.1177/0967033519872540.

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The measurement of strain is a fundamental and widely studied parameter in engineering, rock mechanics, construction and materials testing. Contact sensors often used in these fields require contact with the target surface throughout the duration of a strain event. Non-contact methods typically require that that the measurement surface is prepared and often coated prior to testing. This paper considers the potential application of near infrared spectroscopy as a non-contact technique for the measurement of strain on natural surfaces. Excellent correlation was found between surface measurements of visible-NIR spectra and longitudinal strain taken during indirect Brazilian Disc Test for samples of sandstone, marble and basalt.
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Carabello, Alina, Constanze Neupetsch, Michael Werner, Christian Rotsch, Welf-Guntram Drossel, and Dirk Zajonz. "Comparison of Resistive and Optical Strain Measurement for Early Fracture Detection." Current Directions in Biomedical Engineering 6, no. 3 (September 1, 2020): 196–99. http://dx.doi.org/10.1515/cdbme-2020-3050.

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AbstractTo increase learning success in surgical training, physical simulators are supplemented by measurement technology to generate and record objective feedback and error detection. An opportunity to detect fractures following hip stem implantation early can be measurement of occurring strains on bone surface. These strains can be determined while using strain gauges, digital image correlation (DIC) or photoelasticity. In this research strain gauges and DIC were compared regarding their suitability as strain measurement tools for use in physical simulators. Therefore a testing method was described to replicate the implantation of a hip stem. Testing devices modelled on a realistic prosthesis were pressed into prepared porcine femora in a two-step procedure with a material testing machine. The local strains occurring on bone surface were determined using an optical measurement system for DIC and strain gauges. The initial fractures in the tested femora are located medial-anterior in most cases (73,6%). With increasing indentation depth of the test device, the strains on bone surface increase. Comparing the local strains determined by DIC and strain gauges consistencies in curves are noticeable. Maximal determined strains before fracturing amount to 0,69% with strain gauges and 0,75% with DIC. In the range of the fracture gap, strain gradients are determined by using DIC. However the detected surfaces are of low quality caused by gaps and motion artefacts. The results show strains on bone surfaces for early fracture detection are measurable with strain gauges and DIC. DIC is assessed as less suitable compared to strain gauges. Furthermore strain gauges have greater level of integration and economic efficiency, so they are preferred the use in surgical training simulators.
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Spooner, S., and X. L. Wang. "Diffraction Peak Displacement in Residual Stress Samples Due to Partial Burial of the Sampling Volume." Journal of Applied Crystallography 30, no. 4 (August 1, 1997): 449–55. http://dx.doi.org/10.1107/s0021889897000174.

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Near-surface measurement of residual strain and stress with neutron scattering complements and extends the surface residual stress measurements by X-ray diffraction. However, neutron diffraction measurements near surfaces are sensitive to scattering volume alignment, neutron beam wavelength spread and beam collimation and, unless properly understood, can give large fictitious strains. An analytic calculation and a numerical computation of neutron diffraction peak shifts due to partial burial of the sampling volume have been made and are compared with experimental measurement. Peak shifts in a strain-free nickel sample were determined for conditions where the sample surface is displaced so that the scattering gage volume is partially buried in the sample. The analytic and numerically computed peak shifts take into account the beam collimation, neutron source size, monochromator crystal mosaic spread and the collection of diffracted intensity with a linear position-sensitive counter.
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Schwarzkopf, Matthew, and Lech Muszynski. "Strain distribution and load transfer in the polymer-wood particle bond in wood plastic composites." Holzforschung 69, no. 1 (January 1, 2015): 53–60. http://dx.doi.org/10.1515/hf-2013-0243.

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Abstract The load transfer between wood particles and the matrix was analyzed by observation of the strain patterns in thin films of high density polyethylene (HDPE) with embedded wood particles subjected to tensile loading. Optical measurement techniques based on the digital image correlation (DIC) principle were employed for quantitative measurement of strain distributions on the surfaces of the specimens. Interpretation of these measurements in terms of load transfer between the particle and the matrix below the surface proved challenging and required a structured approach. In this paper, quantitative descriptors were selected as synthesized metrics to support the quantitative interpretation of the measured strains. X-ray computed tomography (XCT) scans were used to assess the effect of the position of the particles in the film specimens on the strains patterns observed on the surface.
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Falk, Alexandru, Octavian Pop, Jérôme Dopeux, and Liviu Marsavina. "Assessment of Strains Produced by Thermal Expansion in Printed Circuit Boards." Materials 15, no. 11 (May 31, 2022): 3916. http://dx.doi.org/10.3390/ma15113916.

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The paper proposed an alternative optical metrology to classical methods (strain gauge measurements and numerical simulation) for strain determination on printed circuit board (PCBs) due to thermal loads. The digital image correlation (DIC) technique was employed to record the strain distribution in some particular areas of the PCB. A thermal load was applied using a heating chamber, and the measurements were performed at four different temperature steps (25 °C, 50 °C, 85 °C and 120 °C). An increase in the principal strains with temperature was observed. For validation, the principal strains on the PCB obtained with DIC were compared with the values from gauge strain measurements and numerical simulation. The conclusions highlighted that DIC represents a technique with potential for strain measurement caused by thermal deformation, with the advantages of full field measurement, less preparation of the surface and good accuracy.
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Umemoto, S., S. Tanoue, N. Miyamoto, T. Takaki, I. Ishii, T. Aoyama, and K. Fujii. "Concrete surface strain measurement using Moiré fringes." Construction and Building Materials 67 (September 2014): 115–20. http://dx.doi.org/10.1016/j.conbuildmat.2013.12.035.

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Best, T. M., J. H. McElhaney, W. E. Garrett, and B. S. Myers. "Axial Strain Measurements in Skeletal Muscle at Various Strain Rates." Journal of Biomechanical Engineering 117, no. 3 (August 1, 1995): 262–65. http://dx.doi.org/10.1115/1.2794179.

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A noncontact optical system using high speed image analysis to measure local tissue deformations and axial strains along skeletal muscle is described. The spatial resolution of the system was 20 pixels/cm and the accuracy was ±0.125mm. In order to minimize the error associated with discrete data used to characterize a continuous strain field, the displacement data were fitted with a third order polynomial and the fitted data differentiated to measure surface strains using a Lagrangian finite strain formulation. The distribution of axial strain along the muscle-tendon unit was nonuniform and rate dependent. Despite a variation in local strain distribution with strain rate, the maximum axial strain, Exx = 0.614 ± 0.045 mm/mm, was rate insensitive and occurred at the failure site for all tests. The frequency response of the video system (1000 Hz) and the measurement of a continuous strain field along the entire length of the structure improve upon previous noncontact optical systems for measurement of surface strains in soft tissues.
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Rajani, B., and C. Zhan. "Indirect estimates of flexural strain in concrete sidewalks induced by vertical movement." Canadian Journal of Civil Engineering 26, no. 3 (June 1, 1999): 312–23. http://dx.doi.org/10.1139/l98-072.

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This paper examines different numerical methods to estimate flexural strain from surface elevation measurements on concrete sidewalks. Surface elevations, along a typical concrete sidewalk cross section, were monitored on a monthly basis as part of a study to determine the cracking mechanism of concrete sidewalks. These measurements were carried out in Calgary, Edmonton, and Camrose, Alberta, between 1993 and mid-1995. Finite difference, cubic spline, polynomial fit, and Fourier series methods of analyses are described for an indirect estimation of flexural strains in sidewalks. The sensitivity of these methods to measurement error is discussed. The Fourier series method is found to be the best procedure to analyse sidewalk surface elevation data for flexural strains estimates. The numerical methods to indirectly determine strain are best suited for those circumstances where installation of strain gauges is difficult, expensive, or impossible.Key words: concrete sidewalks, indirect estimates of flexural strain.
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Grant, B. M. B., H. J. Stone, P. J. Withers, and M. Preuss. "High-temperature strain field measurement using digital image correlation." Journal of Strain Analysis for Engineering Design 44, no. 4 (May 1, 2009): 263–71. http://dx.doi.org/10.1243/03093247jsa478.

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A method is presented for obtaining good images of sample surfaces at high temperatures, suitable for strain measurement, by digital image correlation (DIC) without the use of surface markers or speckles. This is accomplished by suppressing black-body radiation through the use of filters and blue illumination. Using only relatively low levels of illumination the method is demonstrated to be capable of providing accurate DIC measurements up to 1100 °C, and the potential to monitor strains to 1400 °C is identified. The capability of the method is demonstrated by measuring the Young's modulus and coefficient of thermal expansion of a nickel-base superalloy at temperatures from ambient to 1000 °C; two parameters that are well established in the literature and that require high strain sensitivity for their reliable determination.
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KAMAYA, Masayuki, and Masahiro KAWAKUBO. "C101 Growth monitoring of internal surface crack by strain measurement of external surface : Application of multiple strain measurement method." Proceedings of the National Symposium on Power and Energy Systems 2011.16 (2011): 17–20. http://dx.doi.org/10.1299/jsmepes.2011.16.17.

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Dissertations / Theses on the topic "Surface strain measurement"

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Friedlander, Jeffrey B. "Wireless Strain Measurement with Surface Acoustic Wave Sensors." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1306874020.

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Groves, Roger M. "Development of shearography for surface strain measurement of non-planar objects." Thesis, Cranfield University, 2001. http://hdl.handle.net/1826/4053.

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The subject of this thesis is the development of optical instrumentation for surface strain measurement of non-planar objects. The speckle interferometry technique of shearography is used to perform quantitative measurements of surface strain on nonplanar objects and to compensate these measurements for the errors that are due to the shape and slope of the object. Shearography is an optical technique that is usually used for defect location and for qualitative strain characterisation. In this thesis a multi-component shearography system is described that can measure the six components of displacement gradient. From these measurements the surface strain can be fully characterised. For non-planar objects an error is introduced into the displacement gradient measurement due to the variation of the sensitivity vector across the field of view and the variation in the magnitude of applied shear due to the curvature of the object surface. To correct for these errors requires a knowledge of the slope and shape of the object. Shearography may also be used to measure object slope and shape by a source displacement technique. Therefore slope, shape and surface strain may be measured using the same optical system. The thesis describes a method of multiplexing the shear direction using polarisation switching, a method of measuring the source position using shadow Moire and the shearography source displacement technique for measuring the surface slope and shape of objects. The multi-component shearography system is used to perform measurements of the six components of surface strain, on an industrial component, with a correction applied for errors due to the shape and slope of the object.
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Drew, Richard John. "An investigation into sub-surface strain measurement using X-ray radioscopy." Thesis, Loughborough University, 1999. https://dspace.lboro.ac.uk/2134/33075.

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There are numerous techniques used to measure strain. Most are only capable of taking surface measurements. The penetrating nature of X-rays has been used to measure deformation, and thus strain, but only with radiographic images. Radioscopic techniques are faster and do not require film processing, but produce less detailed results than digitised radiographic images. The research covered by this thesis tested radioscopic images and showed them to be suitable for strain measurement. The thesis includes details of the design and capabilities of the radioscopic equipment. Pin cushion distortion is a common feature of radioscopic images, and an automatic method of identifying, and correcting for the distortion was implemented.
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Francis, Daniel. "Surface strain measurement using pulsed laser shearography with fibre-optic imaging bundles." Thesis, Cranfield University, 2008. http://hdl.handle.net/1826/2999.

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This thesis describes the development of a shearography instrument for the quantitative measurement of surface strain on dynamic test objects. Shearography is a non-contact, full-field interferometric speckle technique used for the measurement of displacement gradient. It is often used in industry for qualitative inspection of industrial components. To fully characterize the surface strain, a total of six components of displacement gradient are required. These can be measured using shearography instrumentation with at least three measurement channels. Phase measurements from each measurement channel are combined using a matrix transformation to produce the orthogonal displacement gradient measurements. The instrument presented in this thesis possesses four measurement channels consisting of four views of the object under investigation. Images from the four views are transported to the shearing interferometer using coherent fibre-optic imaging bundles. The signals from the four views are then spatially multiplexed onto the four quadrants of a CCD camera. The optical source is a frequency doubled, pulsed Nd:YAG laser which is used to effectively ‘freeze’ the motion of the dynamic object for the duration of the laser pulse. The optical phase difference between images recorded from two laser pulses is determined using the spatial carrier technique. This method involves introducing a carrier frequency into the recorded speckle pattern using a Mach-Zehnder interferometer. A Fourier transform is used to access the phase dependent spectral features, from which the phase distribution is calculated. The instrument is first validated through the measurement of two static test objects. The results of these measurements are compared with modelled data and with results from a multiple-illumination-direction shearography system using a continuous-wave laser. The instrument is then used to investigate two dynamic objects; a plate rotating at 610 rpm and a speaker cone vibrating at frequencies in the range of 1 – 5 kHz.
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Tuncay, Orbay. "Wireless Strain Gauge System in a Multipath Environment." The Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=osu1222089977.

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vechalapu, uday bhaskar. "Real-Time 2D Digital Image Correlation to Measure Surface Deformation on Graphics Processing Unit using CUDA C." University of Akron / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=akron1522108261138081.

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Nguyen, Tran. "Optical measurement of shape and deformation fields on challenging surfaces." Thesis, Loughborough University, 2012. https://dspace.lboro.ac.uk/2134/10551.

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A multiple-sensor optical shape measurement system (SMS) based on the principle of white-light fringe projection has been developed and commercialised by Loughborough University and Phase Vision Ltd for over 10 years. The use of the temporal phase unwrapping technique allows precise and dense shape measurements of complex surfaces; and the photogrammetry-based calibration technique offers the ability to calibrate multiple sensors simultaneously in order to achieve 360° measurement coverage. Nevertheless, to enhance the applicability of the SMS in industrial environments, further developments are needed (i) to improve the calibration speed for quicker deployment, (ii) to broaden the application range from shape measurement to deformation field measurement, and (iii) to tackle practically-challenging surfaces of which specular components may disrupt the acquired data and result in spurious measurements. The calibration process typically requires manual positioning of an artefact (i.e., reference object) at many locations within the view of the sensors. This is not only timeconsuming but also complicated for an operator with average knowledge of metrology. This thesis introduces an automated artefact positioning system which enables automatic and optimised distribution of the artefacts, automatic prediction of their whereabouts to increase the artefact detection speed and robustness, and thereby greater overall calibration performance. This thesis also describes a novel technique that integrates the digital image correlation (DIC) technique into the present fringe projection SMS for the purpose of simultaneous shape and deformation field measurement. This combined technique offers three key advantages: (a) the ability to deal with geometrical discontinuities which are commonly present on mechanical surfaces and currently challenging to most deformation measurement methods, (b) the ability to measure 3D displacement fields with a basic single-camera single-projector SMS with no additional hardware components, and (c) the simple implementation on a multiple-sensor hardware platform to achieve complete coverage of large-scale and complex samples, with the resulting displacement fields automatically lying in a single global coordinate system. A displacement measurement accuracy of ≃ 1/12,000 of the measurement volume, which is comparable to that of an industry-standard DIC system, has been achieved. The applications of this novel technique to several structural tests of aircraft wing panels on-site at the research centre of Airbus UK in Filton are also presented. Mechanical components with shiny surface finish and complex geometry may introduce another challenge to present fringe projection techniques. In certain circumstances, multiple reflections of the projected fringes on an object surface may cause ambiguity in the phase estimation process and result in incorrect coordinate measurements. This thesis presents a new technique which adopts a Fourier domain ranging (FDR) method to correctly identifying multiple phase signals and enables unambiguous triangulation for a measured coordinate. Experiments of the new FDR technique on various types of surfaces have shown promising results as compared to the traditional phase unwrapping techniques.
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Junge, Michael Dominic Alexander. "Measurement of applied stresses using the polarization of Rayleigh surface waves." Thesis, Available online, Georgia Institute of Technology, 2004:, 2003. http://etd.gatech.edu/theses/available/etd-04062004-164653/unrestricted/junge%5Fmichael%5Fd%5Fa%5F200312%5Fms.pdf.

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Thesis (M.S. in E.S.M.)--School of Civil and Environmental Engineering, Georgia Institute of Technology, 2004. Directed by Laurence Jacobs and Jianmin Qu.
Includes bibliographical references (leaves 113-117).
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Pereira, Pedro André Marques. "Measuring the strain of metallic surfaces in real time through vision systems." Master's thesis, Universidade de Aveiro, 2015. http://hdl.handle.net/10773/16447.

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Mestrado em Engenharia Mecânica
Vision systems have already proven to be a useful tool in various elds. The ease of their implementation, allied to their low cost mean that their growth potential is immense. In this dissertation it is proposed a approach to measure strains in metallic surfaces, using stereo vision. This approach is based on the 3D DIC. This method measures the strain of the surface by dividing this surface in small sections, called subsets, and iteratively nding the equation that describes its shape variation through time. However, calculating the transformation of this subset is very timeconsuming. The proposed approach tries to optimize this calculation by rst determine the displacement eld, and then the strain eld by derivation. The dissertation also presents some experimental data and practical considerations relatively to the camera setup and image equalization algorithms in order to obtain better disparity maps. The results were veri ed experimentally and compared with the results obtained from other softwares.
Os sistemas de vis~ao j a provaram ser uma ferramenta util em v arios campos. A facilidade da sua implementa c~ao, aliada ao seu baixo custo signi cam que o seu potencial de crescimento e enorme. Nesta disserta c~ao e proposta uma abordagem para medir deforma c~oes em superf cies met alicas usando vis~ao stereo. Esta abordagem e baseada na t ecnica 3D DIC. Este m etodo mede as deforma c~oes da superf cie dividindo-a em pequenas se c~oes, designadas por sub- sets, tentando iterativamente encontrar a equa c~ao que de ne as varia c~oes das suas formas ao longo do tempo. No entanto, o c alculo das transforma c~oes destes subsets e demorado. A abordagem proposta pretende pretende otimizar este c alculo determinando primeiro o campo de deslocamentos e depois o campo das deforma c~oes atrav es da deriva c~ao. A disserta c~ao apresenta tamb em dados experimentais e considera c~oes pr aticas relativamente a con gura c~ao (setup) das c^amaras e algoritmos de equaliza c~ao de imagens de forma a se obterem melhores mapas de disparidade. Os resultados foram veri cados experimentalmente e comparados com os resultados obtidos por outros softwares.
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Cuthbert, Douglas Lee. "Experimental determination of the surface displacement of a small flexural disk sonar transducer from surface strain measurements." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1993. http://handle.dtic.mil/100.2/ADA271165.

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Thesis (M.S. in Engineering Acoustics and M.S. in Systems Technology (Antisubmarine Warfare)) Naval Postgraduate School, June 1993.
Thesis advisor(s): Steven R. Baker. "June 1993." Includes bibliographical references. Also available online.
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Books on the topic "Surface strain measurement"

1

Manaf, M. S. Abdul. Measurement of surface strain using optical shearography. Manchester: UMIST, 1994.

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Miles, A. W. Strain Measurement in Biomechanics. Dordrecht: Springer Netherlands, 1992.

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Baum, Rex L. Measurement of slope deformation using quadrilaterals: A description of a new method for measuring displacement at the boundaries of a landslide and strain and tilt at the surface of a landslide. Washington: U.S. G.P.O., 1988.

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Baum, Rex L. Measurement of slope deformation using quadrilaterals: A description of a new method for measuring displacement at the boundaries of a landslide and strain and tilt at the surface of a landslide. Washington, DC: Dept. of the Interior, 1988.

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International Conference on Computer Methods and Experimental Measurements for Surface Treatment Effects (4th 1999 Assisi, Italy). Surface treatment IV: Computer methods and experimental measurements. Edited by Brebbia C. A and Kenny J. M. Southampton, UK: WIT Press, 1999.

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A, Brebbia C., ed. Surface treatment V: Computer methods and experimental measurements. Southampton: WIT Press, 2001.

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Margrit, Hanbücken, and Deville Jean-Paul, eds. Stress and strain in epitaxy: Theoretical concepts, measurements, and applications : keynote lectures of the Third Porquerolles School on Special Topics in Surface Science, Ile de Porquerolles, France, October 1-7, 2000. Amsterdam: Elsevier Science, 2001.

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United States. National Aeronautics and Space Administration., ed. Two-dimensional surface strain measurement based on a variation of Yamaguchi's laser-speckle strain gauge. [Washington, D.C.]: NASA, 1990.

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United States. National Aeronautics and Space Administration., ed. Two-dimensional surface strain measurement based on a variation of Yamaguchi's laser-speckle strain gauge. [Washington, D.C.]: NASA, 1990.

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United States. National Aeronautics and Space Administration., ed. Two-dimensional surface strain measurement based on a variation of Yamaguchi's laser-speckle strain gauge. [Washington, D.C.]: NASA, 1990.

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Book chapters on the topic "Surface strain measurement"

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Kalyanasundaram, Shankar, Paul Compston, and Joel Gresham. "A Methodology for Real Time Surface Strain Measurement for Stamping Through Non-Contact Optical Strain Measurement System." In Sheet Metal 2007, 855–61. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-437-5.855.

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Pegram, Megan S., Theunis R. Botha, and P. Schalk Els. "Full-Field Strain Measurement of the Contact Patch via the Inside Tyre Surface." In Lecture Notes in Mechanical Engineering, 1870–78. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-38077-9_212.

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Wong, R. H. C., Y. S. H. Guo, K. T. Chau, Wei Shen Zhu, and Shu Cai Li. "The Crack Growth Mechanism from 3-D Surface Flaw with Strain and Acoustic Emission Measurement under Axial Compression." In Key Engineering Materials, 2357–60. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-456-1.2357.

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Archer, Robert R. "On the Measurement and Interpretation of Surface Growth Strains." In Growth Stresses and Strains in Trees, 16–49. Berlin, Heidelberg: Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/978-3-662-02511-6_2.

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Singh, Aryan, and Keegan J. Moore. "Joint Interface Contact Area Predictions Using Surface Strain Measurements." In Nonlinear Structures & Systems, Volume 1, 193–95. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-77135-5_22.

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Mura, T., B. Cox, and Z. Gao. "Computer-Aided Nondestructive Measurements of Plastic Strains from Surface Displacements." In Computational Mechanics ’86, 281–86. Tokyo: Springer Japan, 1986. http://dx.doi.org/10.1007/978-4-431-68042-0_36.

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Sarrafzadeh-Khoee, Adel, Russell J. Churchill, Bruce L. Thomas, and Silverio P. Almeida. "A Laser Speckle Image Correlation Instrument for High-Temperature Surface Strain and Deformation Measurements." In Nondestructive Characterization of Materials VI, 715–22. Boston, MA: Springer US, 1994. http://dx.doi.org/10.1007/978-1-4615-2574-5_91.

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Delaplanque, N., S. Chataigner, L. Gaillet, M. Quiertant, K. Benzarti, A. Rolland, X. Chapeleau, and A. Saravia Flores. "Durability in Alkaline Environment of a Fiber Optic Sensor Bonded at the Surface of Reinforcing Bars for Distributed Strain Measurements in Concrete Structures." In Lecture Notes in Civil Engineering, 506–15. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-07258-1_52.

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KORZEN, M., R. SCHRIEVER, K. U. ZIENER, O. PAETSCH, and G. W. ZUMBUSCH. "REAL-TIME 3-D VISUALIZATION OF SURFACE TEMPERATURE FIELDS MEASURED BY THERMOCOUPLES ON STEEL STRUCTURES IN FIRE ENGINEERING." In Local Strain and Temperature Measurement, 253–62. Elsevier, 1999. http://dx.doi.org/10.1016/b978-1-85573-424-1.50030-7.

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Lonsdale, A., and M. J. B. Saunders. "Strain Measurement with Surface Acoustic Wave (Saw) Resonators." In Sensors and Actuators, 20–29. CRC Press, 2020. http://dx.doi.org/10.1201/9781003076964-3.

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Conference papers on the topic "Surface strain measurement"

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Sebastian, J. R. "Strain measurement using surface acoustic waves." In The 27th annual review of progress in quantitative nondestructive evaluation. AIP, 2001. http://dx.doi.org/10.1063/1.1373926.

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Groves, Roger M., Stephen W. James, and Ralph P. Tatam. "Full surface strain measurement using shearography." In International Symposium on Optical Science and Technology, edited by Carolyn R. Mercer, Soyoung S. Cha, and Gongxin Shen. SPIE, 2001. http://dx.doi.org/10.1117/12.449371.

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Chin, T. L., Peng Zheng, Irving J. Oppenheim, and David W. Greve. "Surface acoustic wave devices for wireless strain measurement." In SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, edited by Masayoshi Tomizuka. SPIE, 2010. http://dx.doi.org/10.1117/12.847657.

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Boucher, Maxime, Matthieu Briffaut, and Frédéric Dufour. "Massive Structure Monitoring: Relevance of Surface Strain Measurement." In 10th International Conference on Mechanics and Physics of Creep, Shrinkage, and Durability of Concrete and Concrete Structures. Reston, VA: American Society of Civil Engineers, 2015. http://dx.doi.org/10.1061/9780784479346.029.

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Iliopoulos, Athanasios, and John G. Michopoulos. "Surface Discontinuity Detection via Direct Strain Imaging." In ASME 2013 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/detc2013-13013.

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Direct strain imaging is a recently developed full-field strain measurement method that accomplishes full field measurement of the strain tensor on the surface of a deforming body, by using arbitrarily oriented engineering strain measurements. This new approach doesn’t make any assumption on the compatibility of the strain field and thus it allows for consistent representation of media that may be or may not be discontinuous. In this paper, we present a novel method for detecting whether a discontinuity exists on a deformed body by evaluating the validity of the compatibility conditions over the imaging field. This approach can also be used for quantifying the shape and length of the discontinuity or crack. Synthetic numerical experiments based on the exact solution of a slant crack under biaxial loading were conducted to establish the detectability performance and the associated uncertainty of detection. Very encouraging results were derived indicating that for realistic levels of noise the method was found to be able to detect discontinuities as small as 0.3 mm long with very high confidence.
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Grabner, Daniel, and Walter Lang. "In-Situ Sub-Surface Strain Measurement in Deep Rolling Processes." In 2020 IEEE SENSORS. IEEE, 2020. http://dx.doi.org/10.1109/sensors47125.2020.9278944.

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Barranger, John P. "Two-dimensional surface strain measurement based on a variation of Yamaguchi's laser-speckle strain gauge." In San Dieg - DL Tentative, edited by Chander P. Grover. SPIE, 1991. http://dx.doi.org/10.1117/12.51127.

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Donica, Thomas, Jonathan Gray, and Ephraim F. Zegeye. "Strain Mapping and Large Strain Measurement Using Biaxial Skin Sensors." In ASME 2019 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/smasis2019-5698.

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Abstract Electronic skins, or e-skins, are electronic devices capable of sensing physical interactions such as strain, temperature, or pressure. These e-skins are of interest in a variety of fields including robotics, structural health monitoring, and medicine. E-skins should measure strains over a larger range of elongation than traditional strain sensors could. This paper explores the synthesis of a flexible biaxial strain sensor for large surface strain measurement. The sensor is made by spraying an exfoliated graphite and latex mixture onto a latex substrate to form a 4 × 4 grid of electrically conductive strips. Electrodes are connected to each sensor to collect data on deformation induced voltage difference. Two setup geometries were characterized, the behavior of a single strip in each direction in a one by one configuration as well as the behavior of a four by four setup that can measure a two-dimensional strain field. The characteristics of the sensor is studied by attaching it on a tensile testing specimen. When the sensor is subjected to strain along one or both of the two measurement axes, the voltage difference can be recorded using Arduino. The voltage drop was normalized and used to construct a strain distribution plot in MATLAB to determine the highly strained location. In addition to characterizing the behavior of the sensor, the dispersion of the exfoliated graphite in the latex is also studied using optical microscopy. The sensor is made from inexpensive materials and was able to measure large strain that cannot be achieved with commercially available strain gauges.
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McClung, A. J. W., G. P. Tandon, K. E. Goecke, and J. W. Baur. "Non-Contact Technique for Characterizing Full-Field Surface Deformation of Shape Memory Polymers." In ASME 2010 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. ASMEDC, 2010. http://dx.doi.org/10.1115/smasis2010-3679.

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Thermally-actuated shape memory polymers (SMPs) typically display two phases separated by the glass transition temperature (Tg). At temperatures well below the Tg, the polymer exhibits a relatively high elastic modulus. Well above the Tg the elastic modulus drops by several orders of magnitude. In this high temperature region, SMP materials can achieve strain levels well above 100 %. The complex behavior of SMPs (stiffnesses dropping to the order of 1 GPa and extremely high strain levels) precludes the use of traditional strain gages and low-contact force extensometers. The present study presents a detailed expansion of state-of-the-art thermomechanical testing techniques used to characterize the material behavior of SMPs. An MTS environmental chamber with an observation window allows for non-contact optical measurements during testing. A laser extensometer is used for measurement and active control of axial strain. The upper limit on the strain rate capability of the laser extensometer is established. In addition, the photographic strain measurement method known as digital image correlation (DIC) is incorporated, allowing for full field measurement of axial and transverse strains of SMPs over a range of temperatures and strain rates. The strain measurements of the DIC and laser extensometer are compared to each other as well as to clip-on extensometers and strain gages. The comparisons provide insight into the limitations of the traditional strain measurement systems. A series of tensile tests are performed on a commercial SMP from 25 °C up to temperatures of 130 °C and strain levels above 100 %. The laser extensometer provides a robust method for controlling the strain in the gage section of the samples. In addition, results show that the full field measurements of both the axial and the transverse strain are essential for characterizing the constitutive response of SMPs at room and elevated temperatures.
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Kurokawa, Takaya, Shusuke Narieda, and Hiroshi Naruse. "Ring circumferential strain measurement by strain measurement method based on Brillouin gain spectra under non-uniform strain and using a neural network." In Optical Fiber Sensors. Washington, D.C.: Optica Publishing Group, 2022. http://dx.doi.org/10.1364/ofs.2022.w4.18.

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Circumferential strain formed on the outer surface of a ring is measured using a strain measurement method based on the Brillouin gain spectrum under non-uniform strain and a neural network. The applicability of this method is demonstrated.
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Reports on the topic "Surface strain measurement"

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Fuchs, Marcel, Jerry Hatfield, Amos Hadas, and Rami Keren. Reducing Evaporation from Cultivated Soils by Mulching with Crop Residues and Stabilized Soil Aggregates. United States Department of Agriculture, 1993. http://dx.doi.org/10.32747/1993.7568086.bard.

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Field and laboratory studies of insulating properties of mulches show that the changes they produce on the heat balance and the evaporation depend not only on the intrinsic characteristics of the material but also on the structure of air flow in boundary layer. Field measurements of the radiation balance of corn residue showed a decrease of reflectivity from 0.2 to 0.17 from fall to spring. The aerodynamic properties of the atmospheric surface layer were turbulent, with typical roughness length of 12 to 24 mm. Evaporation from corn residue covered soils in climate chambers simulating the diurnal course of temperature in the field were up to 60% less than bare soil. Wind tunnel studies showed that turbulence in the atmospheric boundary layer added a convective component to the transport of water vapor and heat through the mulches. The decreasing the porosity of the mulch diminished this effect. Factors increasing the resistance to vapor flow lowering the effect of wind. The behavior of wheat straw and stabilized soil aggregates mulches were similar, but the resistance to water of soil aggregate layer with diameter less than 2 mm were very large, close to the values expected from molecular diffusion.
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