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A method for study that effect of the gradient change of the rigidity of base brace on the friction force

A technology of gradient change and friction force, applied in the field of molecular dynamics, to achieve the effect of simple operation, strong controllability and improved efficiency

Active Publication Date: 2019-02-01
LANZHOU UNIVERSITY OF TECHNOLOGY
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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.

Method used

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  • A method for study that effect of the gradient change of the rigidity of base brace on the friction force
  • A method for study that effect of the gradient change of the rigidity of base brace on the friction force
  • A method for study that effect of the gradient change of the rigidity of base brace on the friction force

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Embodiment Construction

[0030] The technical solution of the present invention will be described in further detail below in conjunction with specific drawings and examples.

[0031] 1. Molecular dynamics model

[0032] 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 . The support body and each atom of the substrate graphene are connected by a spring bed whose normal stiffness increases linearly along the X direction. 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 research method for the influence of the base support rigidity gradient change on the friction force. Comprises the following steps: step 1, establishing a molecular dynamicsmodel. The model system consists of a square graphene sheet adsorbed on the tip of a simulated atomic force microscope probe and a monolayer graphene substrate supported by a rigidity gradient. Step2, the effect of the stiffness gradient on the average friction force of graphene. As the stiffness increases, the friction energy consumption decreases. When the stiffness exceeds a certain criticalvalue, the friction force does not decrease any more. Step 3, the influence of stiffness gradient on the normal load. When the bracing stiffness is large, the normal deformation of the substrate is small, the distance between the sheet and the substrate is small, and the Van der Waals force between layers is large. Step 4, the internal mechanism of the influence of the stiffness gradient on the friction force. The friction force is caused by the potential gradient of the interface barrier and the thermal vibration of the atoms with different stiffness, and the boundary barrier caused by the asymmetric deformation of the atoms on both sides of the boundary transition zone and the sudden change of the degree of freedom constraint.

Description

technical field [0001] The invention belongs to the technical field of molecular dynamics, and relates to a research method for the influence of the gradient change of base support stiffness on 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 specific ...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/20G06F2119/06
Inventor 董赟冯瑞成朱宗孝陈卫华何天经
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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