论文标题
界面强度主导微观的折叠形成，软静态摩擦
Interfacial strength dominates fold formation in microscale, soft static friction
论文作者
论文摘要
利用胶体探针，外侧力显微镜和同时共聚焦显微镜结合有限元分析，我们研究了在柔软的粘合表面上微粒的静态摩擦机理。我们发现表面可以在领先的前沿形成一个自我接触的褶皱，这是由于压缩应力的积累而导致的。尽管褶皱本身不会增加峰值力，但需要足够高的侧向电阻才能发生折叠。在实验上，在表现出较高和低正常粘附的底物上观察到褶皱，从而激发了使用模拟来考虑粘附能和界面强度的作用。我们的模拟表明，界面强度在褶皱的形成中起着主导作用，而不是整体粘附能。这些结果表明，仅粘附能不足以预测褶皱或横向力的成核，而是必须考虑定义粘附能的特定参数。
Utilizing colloidal probe, lateral force microscopy and simultaneous confocal microscopy, combined with finite element analysis, we investigate the mechanism of static friction for a microparticle on a soft, adhesive surface. We find that the surface can form a self-contacting fold at the leading front, which results from a buildup of compressive stress. A sufficiently high lateral resistance is required for folding to occur, although the folds themselves do not increase the peak force. Experimentally, folds are observed on substrates that exhibit both high and low normal adhesion, motivating the use of simulations to consider the role of adhesion energy and interfacial strength. Our simulations illustrate that the interfacial strength plays a dominating role in the formation of folds, rather than the overall adhesion energy. These results reveal that adhesion energy alone is not sufficient to predict the nucleation of folds or the lateral force, but instead the specific parameters that define the adhesion energy must be considered.
