Post-buckling analysis of square film under in-plane torsion: experiment and simulation comparisons

IF 3.8 2区工程技术 Q1 ENGINEERING, MECHANICAL

Acta Mechanica Sinica Pub Date : 2025-05-15 DOI:10.1007/s10409-024-24609-x

Yiming Shan (, ), Liang Wang (, ), Wenwang Wu (, )

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Abstract

Thin-film structures are widely used in industry due to their advantages in lightweight, flexibility and deployability. This paper investigates the wrinkling deformation pattern of square film subjected to in-plane torsion through the post-buckling theory of shell, with the geometric nonlinear behavior derived by energy principle and analyzed with finite element method. An equal-sized experimental verification platform is designed and fabricated, and the wrinkling surface of polyimide film driven by rotary motor is reconstructed by 3D-digital image correlation measurement and verified with finite element simulation comparisons. Wrinkling region within the film expands continuously as the torsion proceeds, accompanied by multiple wrinkling configuration transitions throughout the complete evolutionary process. Due to the non-axial symmetry between structure and loading, significant discrepancies arise in amplitude, span and wavelength between different stripes, effects of thickness, torsion radius and pre-stretch on wrinkling pattern configuration are further discussed. This study can provide valuable references for understanding the wrinkling mechanism of hard film under complex torsion loading.

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面内扭转作用下方形膜的后屈曲分析：实验与仿真比较

薄膜结构具有轻量化、柔韧性和可展开性等优点，在工业上得到了广泛的应用。本文利用壳体后屈曲理论，利用能量原理推导出的几何非线性行为，用有限元方法分析了受面内扭转作用下方形薄膜的起皱变形模式。设计并制作了等尺寸的实验验证平台，通过三维数字图像相关测量重构了旋转电机驱动下聚酰亚胺薄膜的起皱表面，并进行了有限元仿真对比验证。随着扭转的进行，薄膜内的起皱区域不断扩大，在整个演化过程中伴随着多次起皱构型的转变。由于结构和载荷之间的非轴对称，不同条纹之间的振幅、跨度和波长存在显著差异，进一步讨论了厚度、扭转半径和预拉伸对起皱图案构型的影响。该研究为理解复杂扭转载荷下硬膜起皱机理提供了有价值的参考。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Acta Mechanica Sinica 物理-工程：机械

CiteScore

5.60

自引率

20.00%

发文量

1807

审稿时长

4 months

期刊介绍： Acta Mechanica Sinica, sponsored by the Chinese Society of Theoretical and Applied Mechanics, promotes scientific exchanges and collaboration among Chinese scientists in China and abroad. It features high quality, original papers in all aspects of mechanics and mechanical sciences. Not only does the journal explore the classical subdivisions of theoretical and applied mechanics such as solid and fluid mechanics, it also explores recently emerging areas such as biomechanics and nanomechanics. In addition, the journal investigates analytical, computational, and experimental progresses in all areas of mechanics. Lastly, it encourages research in interdisciplinary subjects, serving as a bridge between mechanics and other branches of engineering and the sciences. In addition to research papers, Acta Mechanica Sinica publishes reviews, notes, experimental techniques, scientific events, and other special topics of interest. Related subjects » Classical Continuum Physics - Computational Intelligence and Complexity - Mechanics