Test device for acquiring normal contact rigidity of joint surface, and modeling method

Abstract

The invention discloses a test device for acquiring the normal contact rigidity of a joint surface, and a modeling method. The test device comprises a lower test piece placing platform, wherein the lower test piece placing platform is arranged on a base, an inverted cone pit is formed in and a first annular bulge is arranged at the top of the lower test piece placing platform, the inverted cone pit is provided with a small lower part and a large upper part, the center of the first annular bulge and the center of the inverted cone pit coincide, a lower test piece is put in the inverted cone pit, the spherical side of the lower test piece is upward and is higher than the first annular bulge, the top of the lower test piece and the bottom of an upper test piece are contacted, a second annular bulge matched with the first annular bulge is arranged at the bottom of the upper test piece, a three-way force sensor is fixed on the upper test piece and is connected with a hexagonal head screw, one end of a screw is connected with the hexagonal head screw, and the other end of the screw penetrates through a beam of a testing platform. The test device has a simple structure, is convenient to disassemble and assemble, is easy to test repeatedly, and solves the problems of difficulty in testing the normal contact rigidity of the joint surface and difficulty in accurate modeling.

Description

technical field [0001] The invention belongs to the technical field of joint surfaces of mechanical structures, and relates to a testing device and a modeling method for obtaining normal contact stiffness of joint surfaces. Background technique [0002] The rich and complex dynamic characteristics of the binding surface mainly come from the interaction, mutual restriction and interdependence among countless asperities on the microscopic contact surface. The performance of this interaction in the dynamical system is the mutual coupling between the system state variables, so that there are not only a large number of local contact units on the joint surface, but also complex energy dissipation behaviors. The energy dissipation behavior has a sensitive dependence on the initial conditions of the mechanical structure system, and its change process has unstable randomness and irregularity in time and space. Therefore, from a microscopic point of view, it is necessary to study the...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a test device and modeling method for obtaining the normal contact stiffness of the joint surface, which solves the problem that it is difficult to accurately test the normal contact stiffness of the joint surface in the prior art

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