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A fractal model of elastic-plastic contact between rough surfaces for a low-velocity impact process. (English) Zbl 07446706

Summary: Under the low-velocity impact conditions, in order to study the contact load variation law of the ellipsoid elastic bodies, an elastic-plastic contact analysis model of rough ellipsoid surfaces is provided based on elastic-plastic fractal theory. A spherical elastic-plastic fractal model considering friction factors is established, and the spherical diameter density distribution function and elastic contact mechanics are used as the solution methods. The two contact surfaces are taken as the research object, and the influence of relevant variables on the contact intensity is analyzed. The analysis results show that the fractal dimension and roughness have a greater effect on contact performance, the contact load is positively related to the surface roughness, and the lower friction coefficient has a weaker effect on the contact load, and the correctness of the present model is verified by comparing finite element simulation results and other studies. The modified spherical contact load function provides a theoretical basis for the friction and wear of the microscopic surface, it can be applied for solving the sliding contact problems with different impact velocities and the surface bearing capacity of the impact parts can be improved.

MSC:

74-XX Mechanics of deformable solids
76-XX Fluid mechanics
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