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

By Shanglei Li, Anish Poudel (auth.), Helena Jin, Cesar Sciammarella, Sanichiro Yoshida, Luciano Lamberti (eds.)

Advancement of Optical tools 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 significant sector of analysis and engineering. the gathering offers early findings and case reports on a variety of optical equipment starting from conventional photoelasticity and interferometry to more moderen DIC and DVC thoughts, and contains papers within the following common technical examine components:

Optical metrology and displacement measurements at diverse scales

Digital holography and experimental mechanics

Optical size structures utilizing polarized mild

Surface topology

Digital photo correlation

Optical equipment for MEMS and NEMS

Three-dimensional imaging and volumetric correlation

Imaging tools for thermomechanics applications

3D volumetric movement size

Applied photoelasticity

Optical residual tension size techniques

Advances in imaging technologies

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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

Sample text

All these reasons and the moderate cost of the required equipment are gradually bringing DIC the status of standard measurement tool in mechanical testing laboratories. g. , however one of the most interesting applications is the identification of the mechanical properties of materials. Standard mechanical tests, like uniaxial tensile, are designed to produce a uniform state of stress within the specimen. Therefore, several experiments are required to identify, for instance, the elastic stiffness components of orthotropic M.

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. Since these eigenvectors are orthonormal, enormous simplification of the virtual work integrals is obtained, leading to two simple systems of linear equations in the unknown material parameters.

It is interesting noting that this effect is reproduced by the simulator, although the amount of noise input in the images is the same used for the fixed test. An example of experimental and simulated measured strain fields are shown in Fig. 4. From these results it turns out that the simulator is able to reproduce the DIC error when the only source of error is the camera noise. e. the Young’s modulus E and the Poisson’s ratio ν. 2) where εx and εy are the average value of the strain field, F is the applied force and A is the area of the specimen.

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