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Bolt pre-tightening force application method for nonlinear analysis of complex connection structures

A bolt pretightening force and nonlinear analysis technology, which is applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problems of long calculation period and many calculation steps, and achieve the goal of shortening calculation period and reducing analysis steps Effect

Active Publication Date: 2016-03-30
中航(成都)无人机系统股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the disadvantages of long calculation period and many calculation steps in the traditional bolt pretightening force application method, the present invention establishes a new bolt pretightening force application method, which effectively shortens the nonlinear analysis period of complex connection structures and improves the analysis convergence

Method used

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  • Bolt pre-tightening force application method for nonlinear analysis of complex connection structures
  • Bolt pre-tightening force application method for nonlinear analysis of complex connection structures
  • Bolt pre-tightening force application method for nonlinear analysis of complex connection structures

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Embodiment Construction

[0065] Below in conjunction with specific embodiment this method is described in detail:

[0066] 1) Convert the bolt pretightening torque to the bolt axial force.

[0067]2) The loading form of the pre-tightening bolt is simplified

[0068] See the loading form of the pretightening bolt figure 2 , the engineering equivalent simplification of the loading mode of the bolt and the interlayer is carried out, and the bolt and the interlayer are simplified as two rods connected in series with different cross-sectional areas. See image 3 .

[0069] 3) Calculation of bolt axial preload displacement

[0070] according to Figure 4 , the displacement of the bolt is:

[0071] The displacement of the interlayer is:

[0072] Formulas (1), (2) and Figure 4 middle, E 1 is the modulus of elasticity of the bolt material, E 2 Modulus of elasticity of the bolt sandwich material, A 1 is the area of ​​the polished rod of the bolt, A 2 is the effective bearing area of ​​the bolt ...

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Abstract

The invention relates to a bolt pre-tightening force application method for nonlinear analysis of complex connection structures. The method comprises the following steps: 1, converting bolt pre-tightening force moment into bolt axial force; 2, simplifying a pre-tightening force bolt loading form; 3, carrying out displacement calculation on the bolt axial pre-tightening force; and 4, cutting off a pre-tightening force bolt at any place, establishing the constraint relationship between two sections and the section midpoints thereof, and connecting the midpoint 1, the midpoint 2 and a loading point 3, wherein MPC (multipoint constraint) connection is adopted between the midpoint 1 and the section 1 as well as between the midpoint 2 and the section 2, the translation motion and rotation are constrained through the constraint between the midpoints and the sections, namely, Ux / Uy / Uz and Rx / Ry / Rz. The bolt pre-tightening force application method for nonlinear analysis of complex connection structures is obtained through carrying out improvement on the basis of a traditional bolt pre-tightening force application method, so that the simplification of the nonlinear analysis of complex connection structures, the calculation period is effectively shortened and the working efficiency is improved.

Description

technical field [0001] The invention relates to a bolt pretightening force application method, in particular to a bolt pretightening force application method for nonlinear analysis of complex connection structures. Background technique [0002] In order to improve the fatigue performance of connecting bolts in key parts and prevent the bolts from loosening, it is necessary to apply pretightening force to the bolts. In the traditional simulation analysis, the method of applying bolt preload is to cut off the bolt in the middle of the bolt, and then apply the preload, and use the nonlinear iterative algorithm to calculate and calculate in two steps. The first step is to apply constraints and contacts and apply preload to the bolt section. In order to obtain the axial pretightening force displacement of the bolt, the second step is to apply the bolt axial pretightening force displacement δ and external load calculated in the first step to the bolt section, see the appendix of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/17
Inventor 叶建飞王凡钟贵勇裴鹤舒茂盛罗亨存
Owner 中航(成都)无人机系统股份有限公司
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