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Stress Measurements in Alumina by Optical Fluorescence: Revisited

23 Pages Posted: 31 Oct 2018 First Look: Under Review

See all articles by Robert F. Cook

Robert F. Cook

Government of the United States of America - Materials Measurement Science Division

Chris A. Michaels

Government of the United States of America - Materials Measurement Science Division

Abstract

Stress measurements in single crystal and polycrystalline alumina are revisited using a recently-developed optical fluorescence energy shift method. The method simultaneously utilizes the R1 and R2 Cr-related ruby line shifts in alumina to determine two components of the stress tensor in crystallographic coordinates, independent of the intended or assumed stress state. Measurements from a range of experimental conditions, including high pressure, shock, quasi-static, and bulk polycrystals containing thermal expansion anisotropy effects, are analyzed. In many cases, the new analysis suggests stress states and stress magnitudes significantly different from those inferred previously, particularly for shock experiments. An implication is that atomistic models relating stress state to fluorescence shift require refinement for use in materials-based residual stress distribution analyses. Conversely, the earliest measurements of fluorescence in polycrystalline alumina are shown to be consistent with recent detailed measurements of stress equilibrium and dispersion.

Keywords: Fluorescence, Stress and strain, Alumina (Al2O3), Mapping, Image analysis

Suggested Citation

Cook, Robert F. and Michaels, Chris A., Stress Measurements in Alumina by Optical Fluorescence: Revisited (October 30, 2018). Available at SSRN: https://ssrn.com/abstract=3275460

Robert F. Cook (Contact Author)

Government of the United States of America - Materials Measurement Science Division ( email )

Gaithersburg, MD 20899-8910
United States

Chris A. Michaels

Government of the United States of America - Materials Measurement Science Division

Gaithersburg, MD 20899-8910
United States

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