Abstract
In photelasticity a new implementation with CCD camera permits to obtain quickly separated isoclinic and isochromatic patterns and to plot isostatics for one plane model optically sliced.
For small a large strains, using two orthogonal gratings marked upon a plane measure base, we determine, in its plane, the rotation of the rigid solid and the (algebric values of) principal extensions. For that, an optical device works by optical diffractions without contact and at a distance. Methods to improve accuracy are noticed. A set-up permits to extend the method for locally cylindrical surface. The holographic record permits the extension of the measurement to the whole of a plane surface. For dynamic event, the grating interrogation by beam laser with angular coding gives not only strains for local measure base but also rigid motions.
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Lagarde, A. (2000). Recent Developments in 3-D-Photoelasticity and Grating Strain Measurement. In: Laermann, KH. (eds) Optical Methods in Experimental Solid Mechanics. International Centre for Mechanical Sciences, vol 403. Springer, Vienna. https://doi.org/10.1007/978-3-7091-2586-1_2
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DOI: https://doi.org/10.1007/978-3-7091-2586-1_2
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