Spatially resolved piezo-spectroscopic characterizations for the validation of theoretical models of notch-root stress fields in ceramic materials |
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Authors: | Maria Chiara Munisso Satomi Yano Wenliang Zhu Giuseppe Pezzotti |
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Institution: | (1) Ceramic Physics Laboratory, Kyoto Institute of Technology, Sakyo-ku, Matsugasaki, Kyoto 606-8585, Japan;(2) Research Institute for Nanoscience, RIN, Kyoto Institute of Technology, Sakyo-ku, Matsugasaki, Kyoto 606-8585, Japan |
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Abstract: | The main aim of this work is a precise experimental assessment of the local stress fields developed at the notch-root in a
ruby crystal, selected as a paradigm brittle material, by means of photo- and electron-stimulated luminescence techniques.
Our approach takes advantage of the piezo-spectroscopic (PS) effect, which consists of a spectral shift of the luminescence
emitted by the material due to lattice strain. Highly spatially resolved stress maps were extensively collected at the notch-root
and spectral shifts monitored for the chromophoric (R-lines) fluorescence observed in a single-crystalline ruby sample. Experimental data were analyzed and compared to the theoretical
solutions of notch-root stress fields given by Filippi and by Creager-Paris. Due to its inherent simplifications, the Creager–Paris
solution was found leading to underestimation of the maximum stress value piled up in the material, while the Filippi’s solution
represented a more suitable approximation for the stress field developed at the notch-root. |
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Keywords: | Notch-root Cathodoluminescence Photoluminescence Stress Ruby |
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