THERMAL FATIGUE--AN ANALYSIS OF THE EXPERIMENTAL METHOD

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An analysis of the conventional (Coffin-type) thermalfatigue test is presented by describing an analytical model from which three methods for determinlng the plasticstrain range are derived. One of the methods for calculating the plastic strain does not require the knowledge or use of the thermal coefficient, modulus of elasticity, or stress range. The accuracy of this method is not affected by the varintion of the thermal coefficient, modulus of elasticity, or yield strength during the heating and cooling periods. Plastic strains resulting from yielding and relaxation may be accounted for by this method. The errors of conventional methods are discussed. ... continued below

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Pages: 64

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Carden, A.E. January 1, 1963.

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Description

An analysis of the conventional (Coffin-type) thermalfatigue test is presented by describing an analytical model from which three methods for determinlng the plasticstrain range are derived. One of the methods for calculating the plastic strain does not require the knowledge or use of the thermal coefficient, modulus of elasticity, or stress range. The accuracy of this method is not affected by the varintion of the thermal coefficient, modulus of elasticity, or yield strength during the heating and cooling periods. Plastic strains resulting from yielding and relaxation may be accounted for by this method. The errors of conventional methods are discussed. A method for plotting the stress-strain hysteresis loop is also given. From an analysis of the load- temperature loop, it is clearly shown how all of the signlficant variables can be determined without plotting a stress-strain hysteresis loop. The plastic-strain range, the mechanical-strain range (elastic plus plastic), the stress range, and the plastic-strain energy per cycle can easily be determined from the load- temperature loop. An alternate test is suggested that minimizes all of the major difficulties of the conventional test. An improved test specimen for the conventional test is also recommended. (auth)

Physical Description

Pages: 64

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  • Other Information: Orig. Receipt Date: 31-DEC-63

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  • Report No.: ORNL-TM-405
  • Grant Number: W-7405-ENG-26
  • DOI: 10.2172/4762336 | External Link
  • Office of Scientific & Technical Information Report Number: 4762336
  • Archival Resource Key: ark:/67531/metadc1028421

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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Creation Date

  • January 1, 1963

Added to The UNT Digital Library

  • Oct. 18, 2017, 7:39 a.m.

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  • Oct. 23, 2017, 2:59 p.m.

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Carden, A.E. THERMAL FATIGUE--AN ANALYSIS OF THE EXPERIMENTAL METHOD, report, January 1, 1963; Oak Ridge, Tennessee. (digital.library.unt.edu/ark:/67531/metadc1028421/: accessed July 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.