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A biaxial stress transducer for fabrics

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Abstract

A transducer* is developed for measurement of biaxial stresses in fabrics and other flexible sheet materials. The stress transducer responds directly to the far-field stresses by means of strains induced in an elastic inclusion which are monitored by strain gages. Design of the transducer is based on the analytical solution for such inclusions in linear-anisotropic materials, but the concept is applied and tested in nonlinear-orthotropic structural fabrics. Calibration and verification tests are conducted for principal far-field stresses in the yarn directions in vinyl-coated polyester and tefloncoated fiberglass.

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Abbreviations

a i :

coefficients depending on the material constants of the inclusion and the matrix

d 1 :

overall transducer diameter (in.) (25.4 mm)

d 2 :

hole diameter (in.) (25.4 mm)

p :

normal stresses along the warp direction (lb/in.) (1.75 N/cm)

q :

normal stresses along the fill direction (lb/in.) (1.75 N/cm)

t :

transducer thickness (in.) (25.4 mm)

∈ f :

strain along the fill direction

∈ w :

strain along the warp direction

∈ x , ∈ y :

strains

References

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Authors and Affiliations

  1. Department of Civil Engineering and Engineering Mechanics, Columbia University, 10022, New York, NY

    R. B. Testa (Professor of Civil Engineering and Director of Carleton Laboratory)

  2. Egyco Engineering Associates, Inc., New York, NY

    W. Boctor

Authors
  1. R. B. Testa
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  2. W. Boctor
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Testa, R.B., Boctor, W. A biaxial stress transducer for fabrics. Experimental Mechanics 24, 33–39 (1984). https://doi.org/10.1007/BF02323203

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  • DOI: https://doi.org/10.1007/BF02323203

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