A bolt preload application method for nonlinear analysis of complex connection structures

A technology of bolt pretightening force and nonlinear analysis, applied in special data processing applications, instruments, geometric CAD, etc., can solve the problems of many calculation steps and long calculation period, and achieve the effect of reducing analysis steps and shortening calculation period

Active Publication Date: 2018-11-16
中航(成都)无人机系统股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A bolt preload application method for nonlinear analysis of complex connection structures
  • A bolt preload application method for nonlinear analysis of complex connection structures
  • A bolt preload 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 Among them, P refers to the axial pretightening force of the bolt, L refers to the interlayer thickness, and E 1

[0073] is the modulus of elasticity of the bolt material, E 2 Modulus of elasticity of the bolt sandwich m...

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Abstract

The invention relates to a bolt pretightening force application method for nonlinear analysis of complex connection structures, comprising the following steps: step 1: converting the bolt pretightening force moment into a bolt axial force; step 2: simplifying the pretightening force bolt loading form; Step 3: Calculation of bolt axial pre-tightening force displacement; Step 4: Cut off the pre-tightening force bolt at any point, and establish the constraint relationship between two sections and their midpoints, midpoint 1 and section 1, midpoint 2 and The sections 2 are respectively connected by MPC (Multi-Point Constraint), and the translation and rotation between the midpoint and the section are constrained, namely Ux / Uy / Uz and Rx / Ry / Rz; then the midpoint 1, midpoint 2, Load point 3 connection. This method, as a bolt pre-tightening force application method for nonlinear analysis of complex connection structures, is improved on the basis of traditional bolt pre-tightening force application methods, and realizes the simplification of nonlinear analysis of complex connection structures. Effectively shorten the calculation cycle and improve work efficiency.

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 Patents(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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