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Method for researching contributions of probe sheet and each contact area of substrate to friction force

A friction, contact zone technique used in molecular dynamics

Inactive Publication Date: 2019-03-08
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Description
  • Claims
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Problems solved by technology

However, the relative motion that combines the commensurate contact between graphene layers and the gradient change of substrate support stiffness has rarely been studied by scholars at home and abroad.

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  • Method for researching contributions of probe sheet and each contact area of substrate to friction force
  • Method for researching contributions of probe sheet and each contact area of substrate to friction force
  • Method for researching contributions of probe sheet and each contact area of substrate to friction force

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Embodiment Construction

[0041] The technical solution of the present invention will be further described in detail below in conjunction with specific drawings and embodiments.

[0042] 1. Molecular dynamics model

[0043] The model system established by this method includes a square graphene sheet adsorbed by the tip of an atomic force microscope (abbreviated as AFM) and a single-layer graphene substrate supported by a stiffness gradient, as shown in FIG. 1 . A spring bed whose normal stiffness k increases linearly along the X direction is used to connect each atom of the support and the substrate graphene. In order to simulate the probe cantilever, the centroid of the graphene sheet is connected with a spring to an external virtual atom (equivalent to a cantilever beam) that slides at a constant speed of 3 m / s along the X direction. The sheet and the substrate are both zigzag in the sliding direction (that is, degrees of contact) and the same width in the Y direction, and stacked in the A-B manner. ...

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Abstract

The invention discloses a method for researching the contributions of a probe sheet and each contact area of a substrate to a friction force. The method comprises the following steps of step1, using amolecular dynamics method to establish the graphene interlayer friction force model of stiffness gradient support under commensurability contact; step2, analyzing the contributions of the substrate and each contact area of the sheet to friction energy consumption under different substrate centroid stiffness and support stiffness gradients, wherein a soft boundary area always contributes a drivingforce, a hard boundary zone contributes the largest frictional force, and along with the increased of the support stiffness, the contribution ratio of the hard boundary area to total friction is higher; and step3, explaining the internal mechanism of the influence of the stiffness gradients on the friction force of each contact area, wherein the friction force of each contact area is the result of the coupling of an interface fold potential between the sheet and the substrate and a normal deformation difference among the contact areas.

Description

technical field [0001] The invention belongs to the technical field of molecular dynamics, and relates to a research method for the contribution of each contact area of ​​a probe sheet and a substrate to frictional force. Background technique [0002] When two objects in contact move or tend to move relative to each other, the force that hinders their relative movement is called friction, and this phenomenon or characteristic between contact surfaces is called friction. Friction is essentially the irreversible energy dissipation under the interaction of contacting surface atoms, involving complex non-equilibrium thermodynamic processes. From the analysis of the atomic level of the constituent substances, the smooth contact has become a contact with many rough peaks, and the continuum contact theory applied in the macro is no longer applicable to the micro discrete contact model. Graphene is a two-dimensional carbon material with atomic thickness. Because of its unique large...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01Q60/26
CPCG01Q60/26
Inventor 董赟冯瑞成朱宗孝陈卫华何天经
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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