软质胶粘剂分层的扭转不稳定性
Torsional Instabilities in the Delamination of Soft Adhesives
摘要：
软粘合剂接触在自然界中无处不在，并且由于其相对于传统连接技术的优势而越来越多地用于合成系统，例如柔性电子设备和软机器人。虽然研究粘合剂失效的方法通常对粘合剂接头施加拉伸载荷，但对软粘合剂在剪切和扭转下的性能知之甚少，这在工程应用中可能变得重要。一个主要的挑战，阻碍了表征剪切/扭转引起的分层是强加的事实，即使在分层后，保持与基板的接触，从而允许摩擦滑动和重新粘附。在这项工作中，我们解决这个差距，通过研究控制分层的软柱组合压缩和扭转。我们的实验观察揭示了在缺陷处脱层的成核及其沿圆柱圆周的传播。观察到的序列的“粘滑”事件和敏感性的脱层过程中的材料参数解释的理论模型，捕捉轴对称脱层图案，以及随后的摩擦滑动和重新粘附。通过开辟一条途径，改善表征的粘合剂故障，我们的实验方法和理论框架可以指导设计的粘合剂在未来的应用。
英文摘要：
Soft adhesive contacts are ubiquitous in nature and are increasingly used in synthetic systems, such as flexible electronics and soft robots, due to their advantages over traditional joining techniques. While methods to study the failure of adhesives typically apply tensile loads to the adhesive joint, less is known about the performance of soft adhesives under shear and torsion, which may become important in engineering applications. A major challenge that has hindered the characterization of shear/torsion-induced delamination is imposed by the fact that, even after delamination, contact with the substrate is maintained, thus allowing for frictional sliding and re-adhesion. In this work, we address this gap by studying the controlled delamination of soft cylinders under combined compression and torsion. Our experimental observations expose the nucleation of delamination at an imperfection and its propagation along the circumference of the cylinder. The observed sequence of `stick-slip' events and the sensitivity of the delamination process to material parameters are explained by a theoretical model that captures axisymmetric delamination patterns, along with the subsequent frictional sliding and re-adhesion. By opening up an avenue for improved characterization of adhesive failure, our experimental approach and theoretical framework can guide the design of adhesives in future applications.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
