Characterization and modeling of microstructural stresses in alumina
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
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. In conclusion, 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.
- Research Organization:
- Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
- Sponsoring Organization:
- USDOE National Nuclear Security Administration (NNSA)
- Grant/Contract Number:
- AC04-94AL85000
- OSTI ID:
- 1476936
- Report Number(s):
- SAND--2018-10407J; 668234
- Journal Information:
- Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 5 Vol. 101; ISSN 0002-7820
- Publisher:
- American Ceramic SocietyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Full stress tensor measurement using fluorescence spectroscopy
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journal | April 2019 |
Stress Measurements in Alumina by Optical Fluorescence: Revisited
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journal | January 2018 |
Stress Measurements in Alumina by Optical Fluorescence: Revisited
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journal | January 2019 |
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