Temperature-dependent mechanical property testing of nitrate thermal storage salts. Page: 3 of 35
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Printed September 2010
Property Testing of Nitrate Thermal
Scott T. Broome, Randy L. Everett, and David R. Bronowski
Brian D. Iverson and Nathan P. Siegel
Concentrating Solar Technologies
Sandia National Laboratories
P.O. Box 5800
Albuquerque, NM 87185-0751
Three salt compositions for potential use in trough-based solar collectors were tested to
determine their mechanical properties as a function of temperature. The mechanical properties
determined were unconfined compressive strength, Young's modulus, Poisson's ratio, and
indirect tensile strength. Seventeen uniaxial compression and indirect tension tests were
completed. It was found that as test temperature increases, unconfined compressive strength and
Young's modulus decreased for all salt types. Empirical relationships were developed
quantifying the aforementioned behaviors. Poisson's ratio tends to increase with increasing
temperature except for one salt type where there is no obvious trend. The variability in measured
indirect tensile strength is large, but not atypical for this index test. The average tensile strength
for all salt types tested is substantially higher than the upper range of tensile strengths for
naturally occurring rock salts.
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Everett, Randy L.; Iverson, Brian D.; Broome, Scott Thomas; Siegel, Nathan Phillip & Bronowski, David R. Temperature-dependent mechanical property testing of nitrate thermal storage salts., report, September 1, 2010; United States. (digital.library.unt.edu/ark:/67531/metadc1015365/m1/3/: accessed November 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.