Asymmetric bending boundary layer: The λ-test

• 成果类型: Article
• 署名作者: Vani, Nathan; Ibarra, Alejandro; Bico, Jose; Reyssat, Etienne; Roman, Benoit
• 署名单位: Sorbonne Universite; Universite PSL; Ecole Superieure de Physique et de Chimie Industrielles de la Ville de Paris (ESPCI); Universite Paris Cite
• 刊物名称: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
• ISSN/ISSBN: 0027-14315
• DOI: 10.1073/pnas.2426748122
• 发表日期: 2025-03-18
• 关键词: mechanisms; adhesion

摘要

We investigate the mechanics of two asymmetric ribbons bound at one end and pulled apart at the other ends. We characterize the elastic junction near the bonding and conceptualize it as a bending boundary layer. While the size of this junction decreases with the pulling force, we observe the surprising existence of the binding angle as a macroscopic signature of the bending stiffnesses. Our results thus challenge the standard assumption of neglecting bending stiffness of thin shells at large tensile loading. In addition, we show how the rotational response of the structure exhibits a nonlinear and universal behavior regardless of the ratio of asymmetry. Leveraging the independence of the binding angle to the pulling force, we finally introduce the )-test-a visual measurement technique to characterize membranes through simple mechanical coupling.