Journal ArticleDOI
Digital speckle correlation for strain measurement by image analysis
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TLDR
In this article, the authors proposed a method for small strain measurement utilizing the numerical processing of digital images, which is based on the analysis of photographic plates that are exposed twice with the image of a random speckle pattern that has been previously printed on the test piece surface.Abstract:
This paper is concerned with small strain measurement utilizing the numerical processing of digital images. The proposed method has its theoretical basis in digital signal analysis and, from a methodological point of view, it can be considered as an extension to digital images of the wellknown white light speckle photography technique. That conventional method is based on the analysis of photographic plates that are exposed twice (before and after the specimen deformation) with the image of a random speckle pattern that has been previously printed on the test piece surface. The digital speckle correlation advantages consist of requiring a very simple specimen preparation and, mainly, of allowing the strain field computation just by numerical elaboration of the acquired images. In this paper, the theoretical basis of the technique and some valuable improvements to the known analogous methodologies are presented. Finally, test results for an application of digital speckle correlation are shown and advantages and disadvantages of the technique are elaborated. In addition, further developments in this area are discussed.read more
Citations
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Journal ArticleDOI
Measuring the thermal expansion coefficient of tubular steel specimens with digital image correlation techniques
TL;DR: In this article, the authors investigated whether it is possible to measure the coefficient of thermal expansion (CTE) of steel with the aid of the digital image correlation (DIC) technique.
Journal ArticleDOI
Laser speckle based digital optical methods in structural mechanics: A review
I. Manuel De la Torre,María del Socorro Hernández Montes,J. Mauricio Flores-Moreno,Fernando Mendoza Santoyo +3 more
TL;DR: This review will explore and discuss some relevant applications in structural mechanics in the fields of materials in engineering, biomedical and art preservation and restoration and give a frame that place these optical techniques as mature technologies with an absolute relevance to conduct metrology in many fields.
Proceedings ArticleDOI
Feature extraction and health monitoring using image correlation for survivability of leadfree packaging under shock and vibration
Pradeep Lall,D. Iyengar,Sandeep Shantaram,Prashant Gupta,Dhananjay Panchagade,Jeffrey C. Suhling +5 more
TL;DR: In this article, the feature extraction for health monitoring based on optical measurements of transient strain from digital image correlation (DIC) in conjunction with ultra high-speed imaging has been investigated.
Proceedings ArticleDOI
High Speed Digital Image Correlation for Transient-Shock Reliability of Electronics
Pradeep Lall,Dhananjay Panchagade,D. Iyengar,Sandeep Shantaram,Jeffrey C. Suhling,H. Schrier +5 more
TL;DR: In this paper, the use of digital image correlation (DIC) with ultra high-speed imaging has been used for full-field measurement of transient strain in various board assemblies subjected to shock in various orientations.
References
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Journal ArticleDOI
Applications of digital-image-correlation techniques to experimental mechanics
Journal ArticleDOI
Determination of displacements using an improved digital correlation method
TL;DR: An improved digital correlation method is presented for obtaining the full-field in-plane deformations of an object by numerically correlating a selected subset from the digitized intensity pattern of the undeformed object.
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.
Book
Handbook on experimental mechanics
TL;DR: The "Handbook on Experimental Mechanics" as mentioned in this paper is a comprehensive reference in the field of experimental mechanics and has been used extensively in the past 50 years for a wide range of applications.
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