基于褶皱的平流层浮空器升空结构形变模拟

平流层浮空器囊体材料具有非线性、黏弹性、各向异性和不能抗压等特点,起皱现象是在升空膨胀过程中必然会出现的形变状态,褶皱的扩展会影响整个囊体结构的受力状态,改变囊体变形和应力分布.同时,褶皱的存在还会影响囊体结构的动力学行为和空间环境下的热力学分布.通过主应力-主应变相结合准则对褶皱区域进行判别,采用修正褶皱单元的本构矩阵方程的方法对褶皱区域进行处理,地面充氦气试验证明了新方法的模拟结果更加接近测试值.从而为平流层浮空器设计提供了一种有效的分析方法.

Simulation of near-space airship based on wrinkle during ascent

The material of the near-space airship film is nonlinear,anisotropic,viscoelastic and incompressible.Wrinkling will be present as the airship rises and inflates in the atmosphere.The expanding wrinkles can influence stress and strain of the film.Meanwhile,it can change dynamic action and thermodynamic distributing of film in the space environment.The principal stress-principal strain criterion for predicting the wrinkle states and the constitutive matrix equation with modified wrinkle unit were used to anal...