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Simplified Computational Models for Shear-Compliant Borders in Solar Sails

机译：太阳帆中符合剪切力边界的简化计算模型

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摘要

Shear-compliant regions have been demonstrated to reduce both the amplitude and extent of structural wrinkles on the surface of thin-film (gossamer) membranes under simultaneous tension and shear. Rather than modeling the full geometric details of the thermoformed strips that comprise a shear-compliant region, two simplified approaches have been developed for efficiently incorporating them into existing finite element models. One approach replaces the three-dimensional geometry of the thermoformed region with alternating flat strips of high-stiffness/Poisson's ratio and low-stiffnessear-zero Poisson's ratio materials. The other approach uses a properly aligned uniaxial orthotropic material to model the behavior of the shear-compliant region. Both approaches were simulated in finite element software and yielded similar results that qualitatively reflected the behavior of existing membrane test articles containing thermoformed shear-compliant regions. However, numerical results obtained using the model containing the orthotropic material were highly sensitive to the ratio of Young's moduli used to compute the values of the orthotropic material parameters.
机译：剪切顺应性区域已被证明可以在同时受拉和剪切的情况下减少薄膜（游丝）膜表面结构皱纹的幅度和程度。除了对包括剪切顺应区域的热成型带材的完整几何细节建模之外，还开发了两种简化的方法来将其有效地合并到现有的有限元模型中。一种方法是用交替的高刚度/泊松比和低刚度/零泊松比材料的扁平条代替热成型区域的三维几何形状。另一种方法是使用适当对齐的单轴正交各向异性材料来模拟剪切顺应区域的行为。两种方法均在有限元软件中进行了模拟，并得出了相似的结果，定性地反映了包含热成型剪切顺应性区域的现有膜测试制品的行为。但是，使用包含正交异性材料的模型获得的数值结果对用于计算正交异性材料参数值的杨氏模量比非常敏感。

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  • 来源
    《Journal of Spacecraft and Rockets》 |2007年第3期|p.571-581|共11页
  • 作者

    Jack Leifer;

  • 作者单位

    Trinity University, San Antonio, Texas 78212;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 航空;
  • 关键词

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