平流层飞艇蒙皮材料织物纤维拔出过程分析

平流层飞艇高度以及昼夜温差改变，都将引起飞艇内外压差有很大的变化.飞艇蒙皮承力层纱线拔出是其撕裂现象的细观过程，对飞艇耐压能力有着重要的影响.对某平流层飞艇蒙皮材料织物层进行细观力学建模，通过研究纱线拔出过程力的变化，并与试验结果对比，指出整个拔出过程可以分为近似线性增长阶段和振荡阶段，两阶段过渡点纱线拔出力的大小对于蒙皮材料撕裂扩展性能有着重要意义.同时，平流层紫外和臭氧等复杂环境，通过对织物纱线表面老化，降低其表面性能，从而使得最大拔出力减小，飞艇耐压能力降低.

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.