Extracting process of stratospheric airship envelop fabric fiber

Either altitude change or temperature fluctuation will cause expanding difference between the internal and external pressure on envelop of the stratospheric airship. Yarn extraction in the load-carrying ply, a microscopic process of envelop tearing, is crucial for measuring the overall pressure-proof capacity of airship. Finite element model of the load-carrying ply was employed to calculate the force change during extraction procedure. This procedure, indicated by comparison between the numerical calculations with experimental data, can be divided into linear increasing period and oscillating period. The point of transition between the two sequencing periods is a significant factor for envelop tearing. At the same time, complicate environment conditions, such as ultraviolet radiation and ozone, greatly undermine the behavior of load-carrying fabric, causing surface aging, which result in the declination of both the maximum extraction force and overall pressure-proof capacity.