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  • 1
    facet.materialart.
    Unknown
    Development of a strain/temperature gauge and attachment system for use on carbon composites at elevated temperature (1987)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: The difficulties encountered when instrumenting solid rocket motors for acquiring strain data are reviewed, emphasizing the strong temperature dependence due to apparent strain effects. The development of a strain/temperature gage to overcome some of these problems is discussed. This gage is designed to produce low apparent strain when attached to a carbon-carbon substrate. Characterization and performance data for gages attached with ceramic cement to carbon-carbon tensile coupons are presented, and the effect of a flame-sprayed installation process is discussed.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
    facet.materialart.
    Unknown
    An experimental evaluation of apparent strain from foil strain gauges attached to carbon composite substrates (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: An experimental evaluation of apparent thermal strains is conducted using various combinations of substrate/gauge/attachment structure and redundant high temperature extensometry. It is found that the extensometry could either confirm independent measurements of the substrate's thermal expansion, or quantify nonzero mechanical strains resulting from uncertain material behavior and boundary conditions. Apparent strain and thermal expansion behavior data can then be used to modify the raw strain measurements in order to determine either stress producing or total strains. Limitation of the correction procedure for the three selected strain gauges is noted which is due to relatively large gauge/attachment variability.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Unknown
    High-Temperature Strain-And-Temperature Gauge (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Two-element gauge used alternately in two different bridge circuits to measure both temperature and strain. Three-lead strain-and-temperature gauge developed for use at temperatures up to 750 degree F (390 degree C) on fiber-reinforced carbon/carbon composite material having coefficient of thermal expansion of 0.8 ppm/degree F. Unlike most temperature-compensated gauges, gauge gives accurate results even during rapid heating and cooling cycles. Similar gauges produced for materials with different coefficients of thermal expansion.
    Keywords: MECHANICS
    Type: MFS-28320 , NASA Tech Briefs (ISSN 0145-319X); 13; 9; P. 88
    Format: text
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    NASA TECHNICAL REPORTS
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