空间薄膜结构的褶皱形变预测

PREDICTION OF WRINKLE DEFORMATIONS IN THE SPACE MEMBRANE STRUCTURES

  • 摘要: 空间充气结构技术是一项全新的空间结构构建技术,基于该技术的空间充气结构是未来空间任务的主要需求对象. 该结构主要由薄膜构成,因此结构形面精度的保持是关键问题. 褶皱是薄膜特有的现象,它的存在会严重影响结构形面精度,因此进行褶皱研究很有必要.根据屈曲理论联合薄膜褶皱的实际构型建立了薄膜结构褶皱的预测模型,分析了矩形平面薄膜受面内水平剪切情况下的褶皱,得到了褶皱幅度和褶皱波长以及薄膜结构产生褶皱时的临界压缩应力. 通过与已有文献结果及本文实验结果的比较验证了该分析方法的有效性和结果的正确性.

     

    Abstract: construction technology and is the main demanding object inthe future space activities. The inflatable structure is mainly made up ofmembrane; therefore, the maintenance of the structural surface accuracy isone of the most important problems. Wrinkling is the unique characteristicof the flexible membranes, and the wrinkles degrade thesurface accuracy and the structural performance, so, the study on wrinklesin membrane structures is desirable and essential. In this paper, aprediction model of wrinkles is proposed, based on the buckling theory, and thewrinkles, including the wrinkle amplitude, wrinkle wavelength and thecritical compressive stress, in a rectangular membrane subjected to in-planehorizontal shearing loads are predicted using the method proposed in the present paper.The predicted results show good agreement with our recentexperiments and the reported data.

     

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