By Helena Jin, Cesar Sciammarella, Sanichiro Yoshida, Luciano Lamberti
Advancement of Optical tools in Experimental Mechanics, quantity three: lawsuits of the 2014 Annual convention on Experimental and utilized Mechanics, the 3rd quantity of 8 from the convention, brings jointly contributions to this significant region of study and engineering. the gathering offers early findings and case experiences on quite a lot of optical equipment starting from conventional photoelasticity and interferometry to newer DIC and DVC options, and comprises papers within the following basic technical study areas:
· complicated optical tools for frontier applications
· complicated optical interferometry
· Optical dimension platforms utilizing polarized light
· Optical equipment for complicated production
· electronic snapshot correlation
· Optical tools on the micro/nano-scale
· 3-dimensional imaging and volumetric correlation
· Imaging equipment for thermomechanics applications
· Opto-acoustical tools in experimental mechanics
· Optical measurements in demanding environments
· Optical tools for inverse problems
· Advances in optical methods
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Extra info for Advancement of Optical Methods in Experimental Mechanics, Volume 3: Proceedings of the 2016 Annual Conference on Experimental and Applied Mechanics
It can be seen that the two patterns are very similar in their outlines. 18 shows the maps of εx and εy strains computed utilizing the patterns of Fig. 12 and the differentiation in the frequency space . That is, derivatives are obtained directly from fringe patterns without going through the displacements similarly to what is done in the case of the Gabor and the Morlet wavelets. It is possible to see that distributions agree well in their outlines. For a more detailed analysis, the distributions of strain εx along the horizontal axis obtained with the Gabor transform, the Morlet wavelet, the windowed FFT, the 2-D Hilbert transform and the finite element results are plotted in Fig.
573 μm for ANSYS (similar to theoretical solution), respectively. A more detailed comparison is presented in Fig. 16 which shows the distribution of u-displacements measured or computed along the horizontal diameter: experimental data matched well the numerical simulations over the whole region of interest. 7 μm (similar to theoretical solution) while the relative displacement extracted from the fringe pattern with windowed FFT and 2D Hilbert transform are about 18 μm. Both algorithms captured the asymmetry of the v-displacement pattern with respect to the horizontal diameter of the disk but could not reconstruct the whole pattern in the regions where the specimen is loaded (top) and fixed (bottom) as concentration of fringes caused a loss of resolution.
It would be very attractive to extend the technique also to indicate surface strains. This would provide a fullfield, non-contact strain measurement method that avoids the substantial installation burden of strain gauges. Direct surface strain measurement is possible, for example, using a shearography approach , but the strain measurements are very difficult to acquire accurately because they must be separated from much larger surface rotation effects. Alternatively, a compound interferometer divided into four illumination beams could be used .
Advancement of Optical Methods in Experimental Mechanics, Volume 3: Proceedings of the 2016 Annual Conference on Experimental and Applied Mechanics by Helena Jin, Cesar Sciammarella, Sanichiro Yoshida, Luciano Lamberti