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Thermographic analysis of stress concentrations in a composite

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Abstract

This paper examines the stress concentrations in the knit yarn/fiber intersections in a unidirectional carbon/epoxy composite. Stress-concentration factors for four different knit yarn spacings are determined by thermographic stress analysis (TSA). This method is also known in the technical community by several other names. For example the SPATE method (referring to commercially available infrared equipment), and thermoelastic stress analysis. The latter term is not sufficiently descriptive since it is also used to describe purely analytical studies of thermal-stress problems of different phenomenology. Because of these and other technical considerations, TSA is the most accurate and specific terminology for the method at hand.

The two-parameter Weibull distribution function has been applied to analyze the experimental results, and the correlation between the measured values and the distribution is shown to be very good.

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Authors and Affiliations

  1. Department of Engineering Mechanics, University of Wisconsin, 1415 Johnson Drive, 53706, Madison, WI

    D. Zhang (Graduate Student) & B. I. Sandor (Professor)

Authors
  1. D. Zhang
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  2. B. I. Sandor
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Zhang, D., Sandor, B.I. Thermographic analysis of stress concentrations in a composite. Experimental Mechanics 29, 121–125 (1989). https://doi.org/10.1007/BF02321363

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  • DOI: https://doi.org/10.1007/BF02321363

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