A simplified stress-strain model for coated plain-weave fabrics used in Tensioned Fabric Structures

In this paper a new simplified material model for coated plain-weave fabrics used in the construction of Tensioned Fabric Structures (TFS) is developed. The model is considered simplified as it contains fewer elements than other leading model. Despite the simplicity of the model, it possesses high levels of accuracy and reliability. For general background the paper first contains a section on the material response of these fabrics, a review of existing models is then presented. The proposed material model consists of a three nonlinear elements to model the yarns, and an isotropic plate to model the coating. One element each model the warp and weft yarns respectively, with the third element being a crushing element at the yarn crossover point. Each of these elements has a high order interpolation function for the constitutive response to capture the large nonlinearities that exist within these. The validity of the model is shown by comparison with experimental test data from the tests carried out within Kato et al. (1999), as a close resemblance between the two is witnessed. Accuracy of the model is attributed to the model successfully capturing the deformations mechanisms that exist in these fabrics, which are responsible for the global behaviour of fabrics. These deformation mechanisms include crimp interchange, yarn extension and crushing, coating extensions and friction.