Analysis methods for tear properties of stratospheric airship envelope materials

In view of the effect of initial damage on tear properties of stratospheric airship envelope materials, this paper analyzes the empirical formula of four methods for researching flexible laminated fabric material bidirectional tear propagation at home and abroad, and advantages and disadvantages of various methods and application fields are concluded by comparison with the experimental results based on stratospheric airships' envelope materials biaxial tensile test. Furthermore, a conclusion is reached that Taylor formula is more applicable for research on tear properties of envelope materials. At the same time, from the results of comparison between biaxial tensile experiment and empirical equations of materials with different incision shapes, it is concluded that initial damage with different incision shapes can be modeled as the effect of yarns with the same size cut in warp direction, and research on main factors affecting tear strength of envelope material may provide a reference for the further research on the stratospheric airship.