An analysis is presented to predict the biaxial tensile behavior of spun-bonded non-woven fabrics using knowledge of the stress-strain behavior of their constituent fibers and their orientation angle distribution. Nonlinearity in fiber stress-strain behavior is considered in order to predict fabric stresses in the longitudinal and transverse directions under biaxial loading conditions. Only a special case of biaxial loading is considered in which the transverse strain is forced to be zero, i.e., strip biaxial loading conditions. Experimental results are obtained by evaluating four spunbonded fabrics on a Kawabata strip biaxial tester KES-G2 and are compared with the theoretical results.
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