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首页> 外文会议>EPP-vol.6; American Society of Mechanical Engineers(ASME) International Mechanical Engineering Congress and Exposition; 20061105-10; Chicago,IL(US) >Wrinkling of Thin Membrane Under Thermal Loading
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Wrinkling of Thin Membrane Under Thermal Loading

机译：热负荷下薄膜的起皱

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摘要

There has been an increasing interest in the applications of thin membrane in space application, flexible electronic display, manufacturing of glass displays and growth of film on materials at elevated temperatures. Because of the negligible bending stiffness of thin membranes, membranes are lack of resistance to compressive stress. For the applications at high temperatures, the thermal expansion coefficient mismatch between membrane and substrate materials may generate compressive stress that causes the membrane buckling. The study of thermal buckling of isotropic elastic plate in the context of the large - deflection theory was the subject of a series of papers[l-5]. However, it has been noted that none of these papers has considered the second buckling of the membrane resulting in membrane wrinkling. The presence of wrinkles may significantly change deflection and stress profile of membranes. So, it is important to develop an effective analysis method to investigate the wrinkle formation and evolution in membrane subjected the elevated temperature. This paper presents the experiment work to investigate wrinkle formation and evolution in membranes heated from room temperature up to 170 ℃. The specimens consist of polymer and metal membranes with steel and silicon substrate respectively. A wide range of membrane shapes and aspect ratios are considered in this work. An experiment set up is developed to study the deflection profiles of membranes at discrete temperatures. The information gained from this experiment work is used to validate numerical modeling results. The Finite Element Analysis results using nonlinear post-buckling analysis are also included in this paper. The nonlinear post-buckling analysis provides a good understanding of the mechanism of wrinkle generation and evolution as temperature increased. It is shown that the first buckling of membrane significantly reduces bending stiffness thus to create localized buckling modes accounting for the wrinkle generation. The wrinkle pattern is stable until the temperature reaches the next critical value. After this critical temperature, the wrinkle pattern is changed until temperature reaches the next critical value. The new wrinkle pattern is keeping evolved until the final temperature is reached. The finite element analysis results are in good agreement with experimental observations.
机译：人们越来越关注薄膜在空间应用，柔性电子显示器，玻璃显示器的制造以及在高温下材料上的薄膜生长方面的应用。由于薄膜的弯曲刚度可忽略不计，因此薄膜缺乏抗压应力的能力。对于高温应用，膜和基材之间的热膨胀系数不匹配可能会产生压缩应力，从而导致膜屈曲。在大挠度理论的背景下，各向同性弹性板的热屈曲研究是一系列论文的主题[1-5]。然而，已经注意到，这些论文都没有考虑膜的第二屈曲导致膜起皱。皱纹的存在可能会显着改变膜的变形和应力分布。因此，重要的是开发一种有效的分析方法以研究高温下膜的皱纹形成和演变。本文介绍了研究从室温到170℃加热的膜的皱纹形成和演变的实验工作。标本由分别具有钢和硅基底的聚合物和金属膜组成。在这项工作中考虑了各种各样的膜形状和纵横比。建立了一个实验装置来研究膜在不同温度下的挠度分布。从该实验工作中获得的信息用于验证数值建模结果。本文还包括使用非线性后屈曲分析的有限元分析结果。非线性屈曲后分析可很好地理解随温度升高而产生皱纹的机理。结果表明，膜的第一次屈曲显着降低了弯曲刚度，因此产生了局部褶皱模式，从而解决了皱纹的产生。直到温度达到下一个临界值为止，皱纹图案才稳定。在此临界温度之后，皱纹会改变，直到温度达到下一个临界值。新的皱纹会不断发展直至达到最终温度。有限元分析结果与实验结果吻合良好。

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