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Bolt simulation analysis method

A technology of simulation analysis and bolts, applied in design optimization/simulation, special data processing applications, instruments, etc., can solve problems such as large number of grids, affecting efficiency, and difficult calculations, so as to improve grid quality, improve efficiency, and ensure Calculate the exact effect

Active Publication Date: 2019-04-16
NINGBO UNIV
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Problems solved by technology

Among them, the simplified model has a small number of grids, and the grid is straight, so the calculation is simple, but the accuracy is low; while the refined model has high simulation accuracy, but the number of grids is large, and the calculation is difficult, which affects the efficiency

Method used

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specific Embodiment

[0045] A bolt simulation analysis method, comprising the following steps:

[0046] (1) Place the bolts vertically, with the bolt heads facing down, and establish the force direction model of each node of the bolt finite element model: in is the thread mouth angle, β thread line rise angle; θ is the angle occupied by the bolt finite element mesh, n is the number of grids in one circle, and the value of n can be any integer within 12-36; Corresponding to the unit direction vector of the coordinate system x, y, z;

[0047] The specific derivation process of the formula is:

[0048] Such as figure 1 as shown, vertical plane ABCD

[0049] Let the coordinates of A be (rsinθ,rcosθ,z)

[0050] 1. The coordinates of B are Where P is the thread of the bolt, r is the radius of the screw;

[0051] 2. The coordinates of D are

[0052] which is:

[0053]

[0054] have to:

[0055] X direction

[0056]

[0057] Y direction

[0058]

[0059]Z direction

[0...

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Abstract

The invention discloses a bolt emulation analysis method, which is characterized in that the method comprises the following steps: (1) the bolt is arranged longitudinally, the bolt head faces downward, and the stress direction model of each node of the bolt finite element model is established; (2) if the symmetrical axis direction is different from the positive direction, the model rotates correspondingly; (3) The model is imported into Fortran compiler, and if the bolt is standard part, the standard part code of bolt is inputted; If the bolt is a non-standard part, the screw information is input, and the finite element mesh on the bolt surface and the stress direction of each node are obtained by Fortran programming language. (4) the finite element mesh of bolt surface and coordinate vector of stress direction of each node are input into HyperMesh software, TCL macro is run, bolt 3D second-order solid mesh and 2D threaded mesh of stress direction of each node are output. The advantages are simple mesh, high simulation precision and less time-consuming.

Description

technical field [0001] The invention relates to a bolt simulation analysis method. Background technique [0002] Threaded connections are widely used in various mechanical structures and are one of the most commonly used fastening means. For example, the important connection method in the assembly of various components in the engine is the bolt connection. The shield tunnel is an important link in the design and construction of the subway. Its lining is a prefabricated structure, and the joints are mostly connected by bolts. According to the full-scale test of the whole ring that has been carried out so far, the damage of the structure begins at the joints. The structural form and ultimate bearing capacity of joints play an important role in the bearing capacity of the whole ring structure. For the design of joints, the joint surface is generally regarded as a continuous reinforced concrete section approximately, and the bolts are regarded as tensile steel bars. The bolts ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/17G06F30/20
Inventor 陈振雷吕孝鲁李坚成
Owner NINGBO UNIV
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