方向可公度性稳定图案化中尺度界面的结构超润滑性
Directional commensurability stabilizes structural superlubricity in patterned mesoscale interfaces
- Norwegian University of Science and Technology (NTNU)（挪威科技大学）
- Trinity College Dublin（都柏林三一学院）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
该研究针对图案化中尺度界面，通过设计正方形-三角形图案化界面，在特定滑动方向下稳定了结构超润滑性，提升了其承载能力与缺陷耐受性，为低摩擦界面设计提供了原理。
AI中文摘要：
结构超润滑性源于晶格不可公度性，为消除机械系统中的摩擦及相关能量损失提供了极具前景的途径。在实际系统中，粗糙度和磨损目前对其鲁棒性，尤其是接触尺寸构成了严重限制。本文将图案化表面视为克服部分此类限制的可能途径。研究表明，由两个不可公度的三角形-三角形图案构成的最简单图案化接触，在高载荷下会因承载接触点数量过少而失效，导致最大局部接触压力超过超润滑涂层的强度。本文引入正方形-三角形图案化界面，该界面可增加承载接触点数量并将其组织为连续接触线。当沿相对于这些线的特定方向滑动时，超润滑性可在显著更高的载荷下得以维持，同时降低压力诱导的涂层失效风险，且对表面缺陷仍具有一定耐受性。这些发现确立了一种抵御涂层失效以稳定结构超润滑性的机制，以及一种用于设计具备增强承载能力和缺陷耐受性的低摩擦界面的设计原理。
英文摘要：
Structural superlubricity, arising from lattice incommensurability, offers a promising route to eliminate friction and associated energy losses in mechanical systems. In real-world systems, roughness and wear currently pose severe limitations on its robustness and especially the contact size. Here, we consider patterned surfaces as a possible route to overcome some of these limitations. We show that the simplest choice of patterning, contacts made up of two incommensurate triangular-triangular patterns, fails at elevated loads because of the small number of load-bearing contacts, causing the maximum local contact pressure to exceed the strength of the superlubric coating. We introduce a square-triangular patterned interface that increases the number of load-bearing contacts and organizes them into continuous contact lines. When sliding along specific directions relative to these lines, superlubricity is maintained at significantly higher loads by reducing pressure-induced coating failure while also remaining somewhat tolerant to surface imperfections. These findings establish a mechanism for stabilizing structural superlubricity against coating failure and a design principle for engineering low-friction interfaces with enhanced load-bearing capacity and defect tolerance.
