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Characterization and modeling of microstructural stresses in alumina
Author(s) -
Teague Melissa C.,
Rodgers Theron,
Grutzik Scott,
Meserole Stephen
Publication year - 2018
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.15369
Subject(s) - microstructure , microscale chemistry , materials science , residual stress , brittleness , characterization (materials science) , length scale , composite material , nanotechnology , mathematics , mechanics , mathematics education , physics
Brittle failure is often influenced by difficult to measure and variable microstructure‐scale stresses. Recent advances in photoluminescence spectroscopy (PLS), including improved confocal laser measurement and rapid spectroscopic data collection have established the potential to map stresses with microscale spatial resolution (< 2 μm). Advanced PLS was successfully used to investigate both residual and externally applied stresses in polycrystalline alumina at the microstructure scale. The measured average stresses matched those estimated from beam theory to within one standard deviation, validating the technique. Modeling the residual stresses within the microstructure produced qualitative agreement in comparison with the experimentally measured results. Microstructure scale modeling is primed to take advantage of advanced PLS to enable its refinement and validation, eventually enabling microstructure modeling to become a predictive tool for brittle materials.