Abstract: Based on the unit cell model, a simplified truss model for predicting the mechanical properties of coated fabric membrane materials was proposed. According to the tensile test data of the component materials, the fourth-order polynomial with true strain as the variable is selected to describe the nonlinear behavior of the fiber bundle, the mechanical response of the coating is reflected by the ideal elastoplastic model, the microstructure and the structure size parameter of the film is obtained by scanning electron microscopy. The above model was realized by ABAQUS finite element software and UMAT subroutine to predict the tensile properties of the film. The results show that the overall prediction results are good, and the maximum error is about 20%. The main reason for the error is that the nonlinearity of the contact between the fiber bundles and between the fiber bundle and the coating cannot be reflected in the model.

Key words: coated fabric film, simplified truss model, mechanical properties, nonlinear