The extreme flexibility-induced wrinkling significantly hampers the promising engineering applications of membranes, while the existing wrinkling-suppression approaches have challenges for area loss, weight increase and interfacial delamination. Here we propose a facile wrinkle-free technique that enables stiffness modulation through spatioselective ultraviolet (UV) exposure, regulates stress distribution to eliminate compressive stresses and achieves robust wrinkle-free membranes. A small-deformation theoretical model with the Marguerre function is implemented to evaluate the wrinkling capability of a stiffness-modulated membrane, the non-gradient particle swarm optimization (PSO) algorithm is performed to obtain the optimal material distribution, and the related robust wrinkle-free performance is verified through both finite-deformation post-buckling analyses and physical experiments. In addition, an empirical wrinkle-free solution is also given without the requirement of excessive optimization. This wrinkle-free approach, with neither area loss, weight increase nor interfacial delamination, provides useful guidance for the research on wrinkle-free membranes.

中文翻译：

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通过空间选择性暴露实现无皱膜


极端柔韧性引起的起皱严重阻碍了膜的工程应用前景，而现有的起皱抑制方法在面积损失、重量增加和界面分层方面面临挑战。在这里，我们提出了一种简便的无皱技术，通过空间选择性紫外线（UV）暴露实现刚度调节，调节应力分布以消除压应力并实现坚固的无皱膜。采用Marguerre函数的小变形理论模型来评估刚度调制膜的起皱能力，执行非梯度粒子群优化（PSO）算法以获得最佳材料分布，以及相关的鲁棒起皱能力自由性能通过有限变形后屈曲分析和物理实验进行验证。此外，还给出了经验无皱解，无需过度优化。这种无皱膜方法既没有面积损失、重量增加，也没有界面分层，为无皱膜的研究提供了有益的指导。