结构润滑性载荷独立性何时成立？接触几何与弹性顺应性的角色
When Is Structural Lubricity Load Independent? The Role of Contact Geometry and Elastic Compliance
AI总结：
研究通过分子动力学模拟揭示了结构润滑性载荷独立性的条件，发现接触几何和弹性顺应性决定摩擦特性，而非载荷本身。
摘要：
利用不协调的金(111)/石墨界面分子动力学模拟，我们研究了结构润滑性产生载荷独立摩擦的条件。我们表明，严格载荷独立性仅在横向无限、面积填充接触中发生，其中耗散由声子介导的粘性耦合支配，剪切应力与滑动速度成线性关系。具有明确边界终止的有限接触表现出显著更高的摩擦力，但其在临界载荷以下仍保持载荷独立性。载荷依赖性仅在接触线附近弹性垂直变形超过临界振幅时出现，激活了额外的耗散通道。这些结果表明，接触几何和局部弹性顺应性，而非正常载荷本身，决定了载荷独立结构润滑性的起始和失效。
英文摘要：
Using molecular dynamics simulations of an incommensurate Au(111)/graphite interface, we investigate the conditions under which structural lubricity produces load-independent friction. We show that strict load independence occurs only in laterally infinite, area-filling contacts, where dissipation is governed by phonon-mediated viscous coupling and the shear stress scales linearly with sliding velocity. Finite contacts with explicit boundary terminations exhibit substantially higher friction yet remain load independent up to a critical load. Load dependence arises only when elastic out-of-plane deformation near the contact line exceeds a critical amplitude, activating additional dissipation channels. These results demonstrate that contact geometry and local elastic compliance, rather than normal load itself, determine the onset and breakdown of load-independent structural lubricity.
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