The bundle structure formed perpendicular to the scratching direction is a type of wear-induced structure for thermoplastics. In this study, the formation mechanism of bundle structures on polycarbonate (PC) surfaces is investigated by reciprocal scratching experiments. Based on the analysis of the morphologies, friction forces, and height signals, the formation of the bundle structure is reproduced. The influence of scratching parameters, including the feed value and scratching direction, on the formation of the bundle structure is also studied. It is found that the bundle structure is accumulated by the continuous stacking of the sample materials plowed by the tip in stick—slip motion, and that the stick—slip behavior is enhanced with increased scratching times. This work reproduces the formation process of bundle structure in experiments for the first time and demonstrates that the stick—slip enhancement mechanism exists in the reciprocal scratching process, providing further insight into the friction behavior of polymers.

垂直于刮擦方向形成的束结构是热塑性塑料的一种磨损引起的结构。在本研究中，通过相互刮擦实验研究了聚碳酸酯（PC）表面束结构的形成机制。基于对形态、摩擦力和高度信号的分析，再现了束结构的形成。还研究了刮削参数（包括进给值和刮削方向）对束结构形成的影响。研究发现，束状结构是由尖端犁过的样品材料在粘滑运动中连续堆积而积累的，并且粘滑行为随着刮擦次数的增加而增强。