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An experimental method of determining thermal strains

A technique is described which combines the use of frozen-stress photoelastic materials and the electrical-resistance strain-gage techniques of measuring residual strains

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Abstract

If a stress-freezing photoelastic plastic is allowed to cool through the freezing band while supporting a temperature profile, the resulting strain system consists of two parts, a frozen part and an unfrozen part. In the experiments reported in this paper, approximately 95 percent of the unfrozen part bears a known theoretical relationship to the room-temperature modulus, coefficient of expansion and Poisson's ratio of the material. It is argued that if, after freezing, electrical-resistance strain-gage rosettes are attached to the model, and the main body of the model removed from the rosette and the surface to which it is attached, the surface thermal strains corresponding to the initial temperature profile are obtained.

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References

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Authors and Affiliations

  1. University of Bristol, Bristol, England

    D. J. Haines (Research Fellow in Mechanical Engineering)

  2. Department of Engineering Science, Oxford University, Oxford, England

    G. P. Wright (Research Student)

Authors
  1. D. J. Haines
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  2. G. P. Wright
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Haines, D.J., Wright, G.P. An experimental method of determining thermal strains. Experimental Mechanics 9, 327–331 (1969). https://doi.org/10.1007/BF02325139

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  • DOI: https://doi.org/10.1007/BF02325139

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