The large deformation of plain-weave fabrics consist of bundle yarns under biaxial loading is examined by a sinusoidal model. The nonlinear properties, flattening and transverse shear effects of the bundle yarn, as well as the yarn’s crimp interchanges are considered in this study. The constitutive equations are derived from the energy method. Comparison is made with the uniaxial experimental result, and the biaxial behaviors of the fabric are predicted and discussed.

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