A Study on the Modeling Technique of Airbag Cushion Fabric 2003-01-0512
The decision of linear elastic Young's Modulus and other properties of airbag cushion fabric are difficult mainly due to the non-linearity of stress-strain curve of cushion fabric. Especially for the tensile test of cushion fabric, the different test methods add complexity in determining proper linear elastic modulus. Poisson's ratio has been generally assumed as a mean value of steel's one and rubber's one in the modeling of airbag cushion in previous researches (1).
In this study, airbag droptower test and simulation were performed for example to find the proper material properties of airbag cushion fabric such as Young's Modulus, Poisson Ratio, Permeability and Shear Modulus. By modeling the textile cushion fabric material type as isotropic and orthotropic material with linear and nonlinear membrane element, the material properties of cushion fabric with which numerical analysis shows good agreements with droptower test were found. i-SIGHT optimization program has been applied in optimization phase. The DOE (Design Of Experiment) analysis results of cushion fabric material properties are presented.