Advancement of Optical Methods in Experimental Mechanics, by Shanglei Li, Anish Poudel (auth.), Helena Jin, Cesar

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 zone of analysis and engineering. the gathering offers early findings and case experiences on quite a lot of optical equipment starting from conventional photoelasticity and interferometry to more moderen DIC and DVC ideas, and comprises papers within the following normal technical study components:

Optical metrology and displacement measurements at various scales

Digital holography and experimental mechanics

Optical dimension platforms utilizing polarized gentle

Surface topology

Digital photograph correlation

Optical equipment for MEMS and NEMS

Three-dimensional imaging and volumetric correlation

Imaging equipment for thermomechanics applications

3D volumetric stream size

Applied photoelasticity

Optical residual pressure size techniques

Advances in imaging technologies

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Advancement of Optical Methods in Experimental Mechanics, Volume 3: Conference Proceedings of the Society for Experimental Mechanics Series

Development of Optical tools in Experimental Mechanics: complaints of the 2013 Annual convention on Experimental and utilized Mechanics, the 3rd quantity of 8 from the convention, brings jointly contributions to this crucial quarter of analysis and engineering. the gathering offers early findings and case stories on a variety of optical equipment starting from conventional photoelasticity and interferometry to newer DIC and DVC ideas, and contains papers within the following basic technical examine parts: Optical metrology and displacement measurements at diverse scales electronic holography and experimental mechanics Optical dimension structures utilizing polarized mild floor topology electronic snapshot correlation Optical equipment for MEMS and NEMSThree-dimensional imaging and volumetric correlation Imaging tools for thermomechanics applications3D volumetric circulate size utilized photoelasticityOptical residual pressure size techniquesAdvances in imaging applied sciences

Additional info for Advancement of Optical Methods in Experimental Mechanics, Volume 3: Conference Proceedings of the Society for Experimental Mechanics Series

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5 Conclusions 1. In this work, EVFM, a novel implementation of conventional VFM, is proposed. The central idea in EVFM is the systematic generation of virtual displacement and strain fields using the eigenfunctions of two strain matrices that are composites of the three measured in-plane strain component fields. The eigenfunctions are identified by performing SVD of these matrices and the measured strain component fields are reconstructed in terms of only these principal eigenvectors. 2. It is shown that eigenvector decomposition of the measured strain fields and subsequent use of eigenvectors for the virtual fields allows one to interpret the internal virtual work integral as a sum of inner products between the eigenvectors.

The present research deals indeed only with the elastic part of the material behaviour. The same test was repeated several times in order to have statistical information. During each test, the maximum and minimum load was held for 5 s in order to have at least two 30 M. Rossi et al. Fig. 5 fps. From the acquired images, a reference (at minimum force) and a deformed images (at maximum force) were selected. The displacement and strain maps were computed using MatchID [12]. 1. 4 Results and Discussions The performed experimental tests have been then reproduced with the simulator, the results are discussed in this section.

3). These virtual fields also enable simple forms for the virtual displacements on ST, from which the external virtual work term can be calculated. 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.

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