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
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[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
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