关键词: 飞艇蒙皮材料, 热压工艺, 循环拉伸, 能量耗散, 残余应变, 复合材料

Abstract: In order to explore the influence mechanism of the process parameters of the hot-pressing compound on the energy dissipation and residual strain characteristics of the airship envelope material, the polyvinyl fluoride (PVF) film is used as the weather resistant layer, the TPU film as the helium barrier layer, and the polyarylate Vectran fiber woven plain weave as load-bearing layer, and the TPU film as the adhesive layer. The airship envelope materials with various hot-pressing process parameters were prepared by hot-pressing composite method, and the mechanical properties of airship envelope materials are tested and analyzed after cyclic loading-unloading. The influence of hot pressing temperature and hot pressing time on dissipation energy and residual strain is analyzed, and theoretical formulas are proposed. The results show that the hot-pressing temperature and hot-pressing time have the same influence on the energy dissipation and residual strain characteristics of the airship envelope materials, and the fitting degree of the fitting equation is good, and the coefficients are positively correlated with the hot-pressing temperature and hot-pressing time. The energy dissipation and residual strain characteristics of the materials show a two-stage linear characteristic, which is not only dependent on the hot pressing process, but also closely related to the times of cyclic loading and unloading. By comparing the dissipated energy and residual strain of the airship envelope materials prepared under different hot pressing process parameters after cyclic loading and unloading, the optimal preparation process was obtained as follows: Hot pressing temperature is 160 ℃, hot pressing time is 600 s.

Key words: airship envelope material, hot pressing process, cyclic stretching, energy dissipation, residual strain, composites