Static friction coefficient depends on the external pressure and block shape due to precursor slip.

ABSTRACT: Amontons' law states that the maximum static friction force on a solid object is proportional to the loading force and is independent of the apparent contact area. This law indicates that the static friction coefficient does not depend on the external pressure or object shape. Here, we numerically investigate the sliding motion of a 3D viscoelastic block on a rigid substrate using the finite element method (FEM). The macroscopic static friction coefficient decreases with an increase in the external pressure, length, or width of the object, which contradicts Amontons' law. Precursor slip occurs in the 2D interface between the block and substrate before bulk sliding. The decrease in the macroscopic static friction coefficient is scaled by the critical area of the precursor slip. A theoretica

SUBMITTER: Iwashita W 

PROVIDER: S-EPMC9925803 | biostudies-literature | 2023 Feb

REPOSITORIES: biostudies-literature