Abstract
This paper investigates a new constitutive model of the competitive swimwear considering stress-softening. The fabrics for competitive swimwear show nonlinear elasticity regarded as hyperelasticity and they have an anisotropic characteristic which is dependent on the directions of warp and weft yarn. In order to reproduce these properties numerically, hyperelastic model considering anisotropy was produced. In addition, they present a loss of stiffness after first loading of cycle loading test. This phenomenon depended on the maximum deformation previously reached in the history of the material. A stress-softening model using softening ratio of stiffness was proposed. Cyclic loading tests were conducted and the applicability of the model was verified.
