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A constant-stress, vacuum creep-testing apparatus

Authors recommend design as standard equipment for obtaining good tensile or compression constant-stress creep data for uniform deformations up to 50 percent

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Abstract

A mathematical analysis is presented for a direct-linkage tensile and compression creep-testing mechanism. A particular design, employing a dead weight, a cam and a linkage system, achieves constant stress in a tensile specimen during uniform creep deformation. Superiority has been achieved over previous designs in: (1) compactness with mechanical advantages up to 10:1, (2) higher structural rigidity and (3) higher sensitivity in the region of small displacements. The advantage of compactness has now made possible the successful design of a vacuum system for high-temperature creep testing at constant stress. Typical creep curves on iron specimens are induced.

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References

  1. Garofalo, F., Richmond, O. and Domis, W. F., “Design of Apparatus for Constant Stress or Constant Load Creep Tests,” Jnl. Basic Engrg., ASME, 287 (June 1962).

  2. Garofalo, F., Richmond, O., Domis, W. F., and Von Gemmingen, F., “Strain-Time, Rate-Stress, and Rate-Temperature Relations During Large Deformations in Creep,” Proc. Intl. Conf. Creep, August 1963.

  3. Garofalo, F., “Resistance to Creep Deformation and Fracture in Metals and Alloys,” in “Properties of Crystalline Solids,” ASTM STP No. 286, 1960.

  4. McVetty, P. G., “Working Stresses for High Temperature Service,”Engineering,56 (3),149 (1934).

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  5. Li, J. C. M., “A Dislocation Mechanism of Transient Creep,”Acta Met.,11,1269 (1963).

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Author information

Authors and Affiliations

  1. Department of Engineering Mechanics, Ohio State University, Columbus, Ohio

    J. F. Wilson (Graduate Fellow)

  2. Research Department, Inland Steel Co., Hammond, Ind

    F. Garofalo (Assistant Manager)

  3. Applied Research Lab., U. S. Steel Research Center, Monroeville, Pa

    W. F. Domis (Technologist)

  4. Fundamental Research Lab., U. S. Steel Research Center, Monroeville, Pa

    E. P. R. Reiche

Authors
  1. J. F. Wilson
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  2. F. Garofalo
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  3. W. F. Domis
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  4. E. P. R. Reiche
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Wilson, J.F., Garofalo, F., Domis, W.F. et al. A constant-stress, vacuum creep-testing apparatus. Experimental Mechanics 6, 555–558 (1966). https://doi.org/10.1007/BF02327235

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  • DOI: https://doi.org/10.1007/BF02327235

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