标题： 摩擦系统刮擦中的临界现象 显示英文标题

标题： Critical-like phenomenon in scraping of jamming systems

摘要： 在诸如胶体、乳液、泡沫和生物组织等阻塞系统中，显著的形变对于材料刮除或伤口自愈等过程是必不可少的。 为了将泡沫或膏体充分铺展在表面上，必须施加外部力以人工刮除。 使用刚性板刮除泡沫已被观察到表现出与简单液体不同的复杂行为。 在本研究中，我们通过检查内部结构和部分铺展长度的变化，定量分析了部分刮除和细长刮除区域之间的转变。 我们的研究结果表明，泡沫内部结构中气泡重新排列的顺序传播导致了部分刮除。 此外，在部分刮除区域中，刮除长度在转变点附近表现出发散性，其临界指数约为0.61。 这些结果表明，泡沫刮除由方向性渗透理论所支配，这得到了实验观察到的临界指数与理论预测之间一致性的支持。 这项研究显著推进了对阻塞系统（包括泡沫、胶体、乳液和生物组织）宏观动力学和流变行为的理解。 显示英文摘要

摘要： In jamming systems like colloids, emulsions, foams, and biological tissues, significant deformation is essential for processes such as material scraping or wound self-healing. To adequately spread a foam or cream over a surface, external force must be applied to artificially scrape it. The scraping of foam using a rigid plate has been observed to exhibit complex behavior distinct from that of simple liquids. In this study, we quantitatively analyzed the transition between partial and slender scraping regimes by examining changes in internal structure and partial spreading lengths. Our findings reveal that the sequential propagation of bubble rearrangement in the foam's internal structure leads to the partial scraping. Moreover, the scraping length in the partial scraping regime shows divergence near the transition point, characterized by a critical exponent of approximately 0.61. These results imply that foam scraping is governed by directional percolation theory, supported by the agreement between the experimentally observed critical exponent and theoretical predictions. This research significantly advances the understanding of macroscopic kinetics and rheological behavior in jamming systems, including foams, colloids, emulsions, and biological tissues.