Temperature Calibration Techniques for TMF Testing

    Volume 7, Issue 5 (May 2010)

    ISSN: 1546-962X

    CODEN: JAIOAD

    Published Online: 27 April 2010

    Page Count: 6


    Dudzinski, David C.
    National Research Council Canada, Ottawa, ON

    Beres, Wieslaw
    National Research Council Canada, Ottawa, ON

    Kersey, Raymond K.
    Pratt & Whitney, East Hartford, CT

    (Received 17 August 2009; accepted 23 March 2010)

    Abstract

    One of the methods to control the rapid temperature changes during a thermomechanical fatigue (TMF) test involves the use of an infrared pyrometer for temperature measurement. The infrared pyrometer relies on the emissivity of the test coupon. One way to determine this emissivity is to use a disappearing filament pyrometer. This paper presents two emissivity calibration techniques: Strain measurement and application of non-permanent thermocouples. Both techniques were applied for TMF testing, and the advantages and disadvantages of these techniques are described. The results show that the temperature indicated by these methods can significantly differ when compared to the actual temperature of the test specimen measured by thermocouples. However, these variances can be mitigated by calibration.


    Paper ID: JAI102692

    DOI: 10.1520/JAI102692

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    Author
    Title Temperature Calibration Techniques for TMF Testing
    Symposium Ninth International ASTM/ESIS Symposium on Fatigue and Fracture Mechanics (37th ASTM National Symposium on Fatigue and Fracture Mechanics), 2009-05-22
    Committee E08