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Extending the stress-analysis range of brittle coatings

Range of stresses is investigated in both directions by sensitizing the coating to determine small stresses and by using a new calibration device that allows the application of very large strains

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Abstract

In this paper, an attempt is made to extend in both directions the range of the stresses that can be determined using brittle coatings: (1) by sensitizing the coating to determine small stresses, and (2) by the use of a new calibration device that allows the application of very large strains.

The increase in sensitivity is obtained by bathing the coating with cold water under load. The coating used in this manner is shown to have a strain sensitivity as low as 100 μin./in., well below the 400 μin./in. limit imposed by crazing of the coating as it is normally used.

The fixture to apply large strains is described and the method applied to several brittle coatings to calibrate them up to 10,000 μin./in. (1 percent) strain sensitivity.

In conjunction with the above studies, a short test was conducted on the effects of repetitive loading on a brittle coating. Load history was shown to affect strain sensitivity in some cases.

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Authors and Affiliations

  1. Civil Engineering, The Catholic University of America, Washington, D. C.

    V. J. Parks (Research Associate) & A. J. Durelli (Professor)

  2. Armour Research Foundation of Illinois Institute of Technology, Chicago, Ill.

    K. E. Hofer

Authors
  1. V. J. Parks
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  2. K. E. Hofer
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  3. A. J. Durelli
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Parks, V.J., Hofer, K.E. & Durelli, A.J. Extending the stress-analysis range of brittle coatings. Experimental Mechanics 2, 137–149 (1962). https://doi.org/10.1007/BF02325759

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  • DOI: https://doi.org/10.1007/BF02325759

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