Hexahedron finite element grid partitioning method for simulating screw-thread fit

Abstract

The invention relates to a hexahedron finite element grid partitioning method for simulating screw-thread fit. The method comprises the following steps: firstly, according to a distance change rule ofa thread surface and a thread axis, determining a single-layer thread cross section contour line, and using a minimum feature of a thread as the axial finite element grid size; and according to a rotation angle relation between the number of the grid layers axially partitioned within a single thread pitch and the adjacent layer, determining the circumferential finite element grid number, throughthe quadrilateral grid stretching of the bolt thread end face, forming a single-layer hexahedral grid, and performing the copy, the rotation and the node replacement on the single-layer hexahedral grid so as to obtain a single-pitch bolt hexahedral grid model; finally, according to the male-female thread tooth number, performing the copy and the translation on the single-pitch grid so as to obtaina hexahedral grid model of the whole bolt thread part. So, the hexahedron finite element grid partitioning method does not need to build a solid three-dimensional model of a male-female thread, and does not need a lot of the node coordinate calculation.

Description

technical field [0001] The invention relates to the technical field of finite element simulation, in particular to a hexahedral finite element grid division method for simulating thread fit. Background technique [0002] Threaded connection is a widely used detachable fixed connection, which has the advantages of simple structure, reliable connection, and convenient assembly and disassembly. [0003] Among the connection forms between body and chassis (threaded connection, welding, riveting, gluing, etc.), the most common and widely used method is threaded connection, and its connection performance directly affects the vibration mode and safety performance of the vehicle. Since the physical quantities such as compression force and frictional moment cannot be directly measured when threaded connections are in operation, stress analysis and fatigue analysis using finite element simulation technology have become the only way to study the loosening principle of body-chassis syst...

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Problems solved by technology

[0004] There are also technical solutions to the above problems in the prior art, for example: 1) the taper thread joint is created by creating a reference surface and the model surface to generate intersection lines, and divide the hexahedral mesh, but the three-dimensional model of the bolt and nut must be established, the mesh quality and simulation The accuracy is limited by the accuracy of the 3D model; 2) The key geometric dimensions of the bolt model are parameterized in the finite element software, but this method is relatively complicated and the coordinate calculation is large

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