Figure 2: 1D–Frenkel–Kontorova model accounts for the essential features of interfilament sliding friction. [From A. Ward, et al., "Solid friction between soft filaments," Nature Materials (2015). Reprinted by permission from Macmillan Publishers Ltd: Nature Materials ©2015.]
Any macroscopic deformation of a filamentous bundle is necessarily accompanied by local sliding and/or stretching of the constituent filaments. Yet the nature of the sliding friction between two aligned filaments interacting through multiple contacts remains largely unexplored.