Abstract
In this study, biaxial tensile tests of cruciform specimens with open hole were conducted for evaluating the strength of the coated plain weave fabrics composed of high specific tensile strength fibers. In addition to the biaxial tensile tests, uniaxial tensile tests of strip specimens were also carried out to obtain uniaxial fundamental properties of the fabrics. As the results of the biaxial and uniaxial tensile tests, open hole tensile strength of the fabric under biaxial loadings is approximately equal to the strength under uniaxial load irrespective of biaxial load ratio, and warp directional strip specimens exhibit higher strength than that of weft directional specimens in spite of the same densities of yarns in both directions. Experimental results exhibit that misalignment of weft yarns of the membrane partly contributes the loss of the strength in weft direction. The results of observations by microscope and tensile tests of single yarns reveal that the difference of the strength in warp and weft directions is caused by the degradation of weft yarns by heating process of polymer film coating on the fabrics in addition to the misalignment of yarns.
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