By Helena Jin, Sanichiro Yoshida, Luciano Lamberti, Ming-Tzer Lin
Advancement of Optical equipment in Experimental Mechanics, quantity three of the complaints of the 2015SEM Annual Conference& Exposition on Experimental and utilized Mechanics, the 3rd quantity of 9 from the convention, brings jointly contributions to this significant quarter of study and engineering. the gathering provides early findings and case experiences on quite a lot of optical equipment starting from conventional photoelasticity and interferometry to more moderen DIC and DVC strategies, and contains papers within the following normal technical examine parts:
Advanced optical interferometry
Developments in photograph correlation (Digital &Volumetric )
Full box Methods
Novel Optical equipment for Stress/Strain Analysis
Advances in Optical tools
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Additional info for Advancement of Optical Methods in Experimental Mechanics, Volume 3: Proceedings of the 2015 Annual Conference on Experimental and Applied Mechanics
Between 2 quarterwave plates, a birefringent material as a single fiber embedded epoxy resin with retardation ı whose fast axis subtends as angle ® with the ox axis. , the isoclinic parameter. Similarly, the retardation • of the specimen, that is, the isochromatic parameter relates the principal stress difference as ı D 2N D2 C d . 1) where N is the isochromatic fringe order, C¢ is the stress-optic coefficient, d the thickness of the specimen, œ is the wavelength of the monochromatic incident light, and 1 and 2 are the principal stresses.
Additional shock tube characterization, including evidence of boundary layer growth under certain conditions, is discussed elsewhere . After explosive detonation, a planar blast wave is generated due to the shock tube confinement. This blast wave propagates the length of the tube until impinging upon the rupture disc. 254 mm. The surface of the disc is chemically etched with a star pattern that removed approximately 75 % of the disc thickness. This established preferred fracture sites, enabling the surface to rupture into 6 metal petals that generally remained attached.
Although both cross-ply and interlaminar damage was expected during the test, major interest was focused on interlaminar shear and corresponding interlaminar damage. A custom fixture was fabricated to allow shear of the specimens as shown at Fig. 5a. Corresponding details of local boundary conditions and load, applied through a metallic impactor, are shown at Fig. 5b. As proposed, through-thickness DIC-based characterization was applied to quantify strain patterns of a symmetric half of the considered composite coupons (see Fig.