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Method of computing threaded connection strength based on beam-spring model

A threaded connection and strength calculation technology, applied in calculation, special data processing applications, instruments, etc., can solve problems such as no theoretical model, and achieve high calculation accuracy

Inactive Publication Date: 2013-07-24
BEIHANG UNIV
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  • Abstract
  • Description
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Problems solved by technology

These studies have improved the unbalanced force on each tooth of the bolt to a certain extent, but there is no concise and effective theo

Method used

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  • Method of computing threaded connection strength based on beam-spring model
  • Method of computing threaded connection strength based on beam-spring model
  • Method of computing threaded connection strength based on beam-spring model

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Embodiment

[0134] Take the elastic modulus of the material as E=2.1×10 5 N / m 2 (Ordinary carbon steel), the major and minor diameters of bolts are R=5.000mm, r=4.026mm respectively, the major and minor diameters of nuts are C=3.97mm, c=3mm respectively, the thickness of the thread teeth h=1.125, the connecting part between the teeth Thickness l=0.375, tooth half-angle π / 6 (standard M10 threaded connection), the bearing ratio of each tooth is calculated by MATLAB. The calculation results are as follows:

[0135] Table 1 Comparison of Calculation Results

[0136]

[0137] By changing the elastic modulus of the threaded connection material, the size parameters of the tooth shape, and the half-angle of the tooth shape, the force distribution of the threaded connection is optimized.

[0138] First, change the elastic modulus of the material, and the distribution is shown in Table 2 (E1 is the elastic modulus of the bolt, and E2 is the elastic modulus of the nut):

[0139] According to ...

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Abstract

The invention discloses a method of computing threaded connection strengthbased on a beam-spring model. The method comprises the following steps of: firstly, establishing a reasonable threaded connection beam-spring simplification model by utilizing stress balance, deformation state, boundary conditions and deformation continuation/coordination conditions of the threaded connection; secondly, solving the beam-spring model to obtain stress and deformation conditions of the beam-spring model; and at last, reducing the stress and deformation conditions of the beam-spring model to the original threaded connection state so as to establish amethodforsolving stress distribution of each threaded connection toothand for computing the threaded connection strength based on the beam-spring model. According to the invention, the original solid model is greatly simplified, and a reasonable and operable mechanical model is established, so that the strength conditions of a threaded connection piece can be analyzed and checked through the model other than a solid; in comparison with the conventional modeling method, the mechanical model is closer to the solid model, higher in simulation and computational accuracy, and wider in application.

Description

technical field [0001] The invention is applicable to the analysis of the force distribution of each tooth of the threaded connection, to check whether the strength of the threaded connection is up to the standard, and can be used to guide the optimization of the force distribution of the threaded connection by changing the tooth shape and material parameters, thereby improving the strength of the connection. Carrying capacity. Background technique [0002] Threaded connectors are widely used in various industrial sectors. According to statistics, the United States alone produces 100 billion screwed connectors a year. There are two main problems in the use of threaded joints, which have not been well resolved at present, namely the fatigue damage and self-loosening of the bolts. [0003] For different loading forms, the failure modes of bolts are very different. The damage of the tension bolt under static load is mostly the plastic deformation and fracture of the thread pa...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 张铮陈天宇安向阳王晓军刘磊
Owner BEIHANG UNIV
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