A combination optical method of lateral shearing interferometry and caustics |
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Authors: | S Prabhu J Lambros |
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Institution: | (1) Department of Mechanical Engineering, University of Delaware, 19711 Newark, DE |
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Abstract: | A novel experimental technique is presented that combines the optical method of caustics and the full-field lateral shearing
interferometer of coherent gradient sensing (CGS) in one setup. Collimated light transmitted through a deformed specimen is
separated into two legs. One is processed by the lateral shearing interferometer and is recombined with the other on a single
image plane. By adjusting the optical path length of each leg, a combination lateral shearing interferogram/caustic image
is generated. When this technique is applied to a fracture specimen, information about the stress intensity factor can be
obtained from the caustic and the CGS interference fringes for exactly the same deformation field. This allows for a direct
comparison between the two methods when investigating phenomena such asK-dominance, three-dimensional deformation and so on. In this paper, the technique is presented in detail, and its feasibility
is tested by application to mode I and mixed-mode crack tip deformation fields. |
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Keywords: | Bifocal caustics combination optics lateral shearing interferometry fracture |
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