By Shanglei Li, Anish Poudel (auth.), Helena Jin, Cesar Sciammarella, Sanichiro Yoshida, Luciano Lamberti (eds.)
Advancement of Optical equipment in Experimental Mechanics: Proceedings of the 2013 Annual convention on Experimental and utilized Mechanics, the 3rd quantity of 8 from the convention, brings jointly contributions to this crucial sector of study and engineering. the gathering provides early findings and case experiences on quite a lot of optical tools starting from conventional photoelasticity and interferometry to more moderen DIC and DVC strategies, and contains papers within the following common technical learn parts:
Optical metrology and displacement measurements at diversified scales
Digital holography and experimental mechanics
Optical size structures utilizing polarized mild
Digital snapshot correlation
Optical tools for MEMS and NEMS
Three-dimensional imaging and volumetric correlation
Imaging equipment for thermomechanics applications
3D volumetric move size
Optical residual rigidity size techniques
Advances in imaging technologies
Read or Download Advancement of Optical Methods in Experimental Mechanics, Volume 3: Conference Proceedings of the Society for Experimental Mechanics Series PDF
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Additional info for Advancement of Optical Methods in Experimental Mechanics, Volume 3: Conference Proceedings of the Society for Experimental Mechanics Series
The logarithm of the result is then taken to obtain the restored distribution. The phase derivative map deconvolved with Wiener filtering in shown in Fig. 2c. Comparing this map with that shown in Fig. 1b shows that this is a good compromise between high frequencies restoration and noise level in the phase derivative deconvolved map. A more refined analysis of the results obtained with the latter technique shows that Wiener filtering outperforms the Richardson-Lucy algorithm if the noise in the maps to be deconvolved is correctly characterized .
In this way, richer information about the material behaviour can be obtained in a single test because the material is submitted to different stress conditions at different locations of the test specimen. Different methods are available to extract the mechanical properties of materials from full-field measurements, for instance the finite element updating [1, 2], the virtual fields method  and many others. A review of these methods can be found in . Although by then an extended literature is available on the different types of identification methods, much less papers have been dedicated to the study of the interactions between the identification procedure and the full-field optical technique used to obtain the strain data.
To make these ideas clear, the problem of determining the elastic constants of an isotropic, linear elastic solid using fullfield strain data from a uniaxial tension of a plate is studied. The objective in choosing this model problem is to highlight the various steps involved in EVFM; a more formal development of the method and its application to more general constitutive equations will be taken up elsewhere. Let the thickness h of the plate be small enough for plane stress conditions to prevail and the area of interest be a rectangular region (as is common in many experiments) of extent L1 ÂL2 as shown in Fig.