The 9th International Conference on Multiscale Materials Modeling

Presentation information

Symposium

L. Structure, Statistics and Mechanics in Crystal Dislocation Plasticity

[SY-L2] Symposium L-2

Mon. Oct 29, 2018 3:45 PM - 5:45 PM Room8

Chairs: Charles Reichhardt(Los Alamos National Laboratory , United States of America), Peter Schall(University of Amsterdam, Netherlands)

[SY-L2] Dislocations associated with stick-slip friction of lubricants in boundary lubrication

Rong-Guang Xu1,2, Hengxu Song2, Stefanos Papanikolaou2, Yongsheng Leng1 (1.George Washington Univ, United States of America, 2.West Virginia Univ, United States of America)

Improved understanding of squeezing and frictional behaviors of lubricant films under extreme confinement at nanometer scales can lead to strategies for preventing surface failure and efficient energy usage. Shearing of a solidified simple nonpolar film under nanoconfinement is studied by using a liquid-vapor molecular dynamics simulation method. We find that, in contrast with the shear melting and recrystallization behavior of the solidlike phase during the stick-slip motion, interlayer slips within the film and wall slips at the wall-film interface are often observed. The ordered solidified film is well maintained during the slip. However, repeated film dilation and collapse of the lubricant film during the stick-slip friction are observed, which is associated with the nucleation, propagation and annihilation of dislocations found in the solidlike film. These novel observations may provide new insights into the mechanical behaviors of lubricant films and thus improved lubricant design.