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Ultraviolet digital image correlation (UV-DIC) for high temperature applications.

Ryan B Berke1, John Lambros1

  • 1Department of Aerospace Engineering, University of Illinois, 306 Talbot Laboratory, 104 S. Wright St., Urbana, Illinois 61801, USA.

The Review of Scientific Instruments
|May 3, 2014
PubMed
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A novel ultraviolet digital image correlation (UV-DIC) method extends high-temperature measurements by minimizing specimen glowing. This technique offers superior performance compared to traditional white and blue light methods at elevated temperatures.

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Area of Science:

  • Materials Science
  • Optical Measurement Techniques
  • Mechanical Engineering

Background:

  • High-temperature material characterization is crucial for performance evaluation.
  • Traditional digital image correlation (DIC) methods struggle with specimen self-illumination (glowing) at elevated temperatures.
  • Existing high-temperature DIC techniques using white or blue light have limitations due to specimen glowing.

Purpose of the Study:

  • To introduce and evaluate a new method, ultraviolet digital image correlation (UV-DIC), for high-temperature strain analysis.
  • To compare the performance of UV-DIC against conventional white light and blue light DIC methods under increasing temperatures.
  • To assess the accuracy of UV-DIC in determining material properties like the coefficient of thermal expansion at high temperatures.

Main Methods:

  • Development of a UV-DIC system utilizing ultraviolet lights and optics to mitigate specimen glowing.
  • Comparative experimental analysis of UV-DIC, white light DIC, and blue light DIC across a range of temperatures.
  • Application of the tested DIC methods to measure the coefficient of thermal expansion of Hastelloy-X and conduct uniaxial tension tests.

Main Results:

  • All three methods yielded comparable results at low temperatures where specimen glowing was negligible.
  • Significant specimen glowing affected white light DIC between 500-600°C and blue light DIC between 800-900°C.
  • UV-DIC demonstrated minimal impact from glowing up to approximately 1260°C, nearing the material's melting point.
  • Coefficients of thermal expansion measured by all methods agreed well with manufacturer specifications and each other below glowing thresholds.
  • Similar performance trends were observed in uniaxial tension tests.

Conclusions:

  • UV-DIC significantly enhances the capability of two-dimensional digital image correlation for high-temperature applications by overcoming specimen glowing issues.
  • The UV-DIC method provides reliable and accurate strain measurements at temperatures substantially higher than conventional white or blue light DIC.
  • This advancement enables more precise material characterization and performance evaluation of alloys like Hastelloy-X under extreme thermal conditions.