Elasticity limits structural superlubricity in large contacts

Article

关键词: SINGLE-ASPERITY CONTACTS;    FRICTION;    ORIGINS;    XENON;   

DOI  :  10.1103/PhysRevB.93.121402

来源: SCIE

【 摘 要 】

Geometrically imposed force cancellations lead to ultralow friction between rigid incommensurate crystalline asperities. Elastic deformations may avert this cancellation but are difficult to treat analytically in finite and three-dimensional systems. We use atomic-scale simulations to show that elasticity affects the friction only after the contact radius a exceeds a characteristic length set by the core width of interfacial dislocations b(core). As a increases past b(core), the frictional stress for both incommensurate and commensurate surfaces decreases to a constant value. This plateau corresponds to a Peierls stress that drops exponentially with increasing b(core) but remains finite.

【 授权许可】

Free