The local deformation about fatigue cracks has been investigated by the coherent optics method of moiré interferometry. The complexity of the interference fringe patterns motivated the parallel development of companion numerical models for simulating moiré interferometric response for known boundary conditions. Experimental patterns are here examined in the light of computer-generated fringe systems for a stationary crack in elastic as well as elastic-plastic solids. Various effects due to material plasticity, specimen-dependent non-singular stress, and mixed mode loading are identified in the fringe patterns.
Moirè Interferometric Fringe Patterns about Crack Tips : Experimental observations and Numerical simulation / G. Nicoletto. - In: OPTICS AND LASERS IN ENGINEERING. - ISSN 0143-8166. - 12(1990), pp. 135-150. [10.1016/0143-8166(90)90013-Y]
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