受弯充气锥台的褶皱特性分析

WRINKLING CHARACTERISTIC ANALYSIS OF A CONICAL INFLATED CANTILEVER BEAM UNDER BENDING

充气锥台是空间充气膜结构的主要承载力构件单元之一,膜面褶皱是导致其承载力降低的关键因素。该文基于薄膜理论分析了受弯充气锥台的褶皱特性。借助褶皱的应力判定准则对褶皱特征参数进行了预报,得到了初始起皱位置和起皱力随充气锥台两端半径比的变化规律,并得到了数值分析结果的验证。该文的结果为空间充气薄膜结构的承载能力预报提供重要依据。

A conical inflated cantilever beam is the major load-carrying framework of space inflatable membrane structures.The local wrinkling is the crucial factor resulting in reducing load-carrying abilities of the inflatable structures.Wrinkling characteristics of a conical inflated cantilever beam under bending is analyzed based upon the membrane theory.The predictions of wrinkling characteristic parameters are performed by using the wrinkling stress criteria.The rules of the initial wrinkling location and the wrinkling critical force versus the ratio of both ends of the conical inflated cantilever beam are obtained and they are also verified by our numerical results.The conclusions drew in this paper are the important supporting references on the predictions of the load-carrying ability of space inflatable membrane structures.