Title: SOME THEORETICAL AND PRACTICAL ASPECTS OF PIEZO-RAMAN

Abstract:
Stresses can be measured non-destructively with a high spatial resolution using the frequency shift of Raman vibrational peaks. The predicted frequency shifts for polycrystalline ceramics have been estimated from single crystal phonon deformation potentials (PDPs) and secular equations by averaging over all coal orientations. Predicted shifts are presented for all coal classes and compared to some experimentally measured shifts. Some practical aspects such as number of grains sampled, depth of penetration and direction of polarization will be discussed Demonstrations of the usefulness of the technique for analyzing unique mechanics problems in ceramics such as thermal barrier coatings, transformation toughening, residual thermal stress in composites, fiber composites and laminates will be presented.
(Ref. SXVIIIP-004-97)

Source: NDE of Ceramics '97 May 4-7, Symposium on Nondestructive Evaluation of Ceramics at the American Ceramic Society 99th Annual Meeting, Cincinnati, Ohio.
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