Finite element modelling method and strength assessment method of high-strength bolt connecting structure

A high-strength bolt and connection structure technology, applied in special data processing applications, instruments, electrical and digital data processing, etc. Research and development progress, ensure the effect of design optimization and iteration

Inactive Publication Date: 2018-01-09
GUODIAN UNITED POWER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The high-strength bolts used in wind turbines have the characteristics of complex connected structures, various external bearing forms, large numbers of bolts and disorderly arrangement, so it is possible to find a fast and convenient finite element modeling that can accurately reflect the performance of bolts. The method becomes the key factor to solve the bolt design analysis

Method used

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  • Finite element modelling method and strength assessment method of high-strength bolt connecting structure
  • Finite element modelling method and strength assessment method of high-strength bolt connecting structure
  • Finite element modelling method and strength assessment method of high-strength bolt connecting structure

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Experimental program
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Effect test

Embodiment 1

[0036] Such as Figure 1 to Figure 3 As shown, the high-strength bolt 4 connection structure includes a screw rod 3 with the same length as the high-strength bolt and a bolt head 1 located at one end of the screw rod 3, and the other end of the screw rod 3 is threaded to the clamping body. Including the following steps:

[0037] 1) Carry out three-dimensional solid modeling for the position of the threaded hole of the bolt head 1 and the clamping body: the bolt head 1 and the position of the threaded hole of the clamping body are segmented and geometrically processed to obtain several 3D geometric bodies, so that they can be scanned and generated evenly Grid conditions; sweep the 3D geometry to generate a uniform hexahedral grid;

[0038] 2) if image 3 As shown, the three-dimensional beam unit is used to simplify the simulated screw part: the screw part 3 is simplified into a straight line segment located at the axis position and equal in length to the high-strength bolt. T...

Embodiment 2

[0053] On the basis of Embodiment 1, the threaded rod 31 at the other end of the screw rod 3 adopts the nut 2 connection method to replace the threaded connection with the clamping body; correspondingly, the threaded hole position of the clamping body is replaced by the nut 2, and other suggestions Modeling method, evaluation method are identical with embodiment one step, as Figure 1 to Figure 3 shown.

Embodiment 3

[0055] On the basis of Example 1, as Figure 4 As shown, the screw rod 3 having the same length as the high-strength bolt is replaced with a stud 4' having the same length as the high-strength bolt 4, and the bolt head 1 at one end of the screw rod 3 is replaced with the first nut 1 at one end of the stud 4' ', screw 3' is divided into threaded rod 31' and polished rod 32', the finite element modeling method of double-ended stud connection structure includes the following steps:

[0056] 1) Carry out three-dimensional solid modeling of the first nut 1' and the threaded hole position of the clamping body: segment and geometrically process the first nut 1' and the threaded hole position of the clamping body to obtain a number of three-dimensional geometry, so that it has Conditions for sweeping to generate a uniform mesh; sweeping a 3D geometry to generate a uniform hexahedral mesh;

[0057] 2) Simplify the simulated screw part with a three-dimensional beam element: Simplify th...

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Abstract

The invention discloses a finite element modelling method of a high-strength bolt connecting structure. The connecting structure comprises a threaded rod equal to a bolt in length and a bolt head located at one end of the threaded rod, and the other end of the threaded rod is connected with a clamping body through threads. The modelling method comprises the steps that three-dimensional solid modelling is conducted on the positions of threaded holes of the bolt head and the clamping body; the threaded rod portion is simply simulated by means of a three-dimensional beam unit; a beam unit connects a node of a solid unit and a node in the corresponding position of the three-dimensional beam unit. Threaded connection between the other end of the threaded rod and the clamping body can be replaced by nut connection between the other end of the threaded rod and the clamping body; the threaded rod can be replaced by a double-end stud, and the bolt head can be replaced by a nut. The invention further discloses a strength assessment method of the high-strength bolt connecting structure. The strength assessment method comprises the steps that three-dimensional solid unit modelling is conductedon the clamping body, and interaction is simulated; pre-tightening force is applied to the threaded rod beam unit, an external-applied load and a constraint are applied to the clamping body, and solving is conducted through stepped loading; the result is extracted, and the load status is analyzed and judged. By means of the finite element modelling method and the strength assessment method of thehigh-strength bolt connecting structure, the result precision and the calculating efficiency can be guaranteed.

Description

technical field [0001] The invention relates to the field of bolt modeling, in particular to a finite element modeling method and a strength evaluation method suitable for a high-strength bolt connection structure of a wind power generating set. Background technique [0002] High-strength bolts are currently one of the most commonly used forms for structural connections in industrial design, and their advantages are flexible design, easy disassembly, and convenient post-maintenance of the connected structure. However, due to the complex construction process of bolted connection, it is more affected by external factors. Therefore, it is necessary to accurately analyze the bearing characteristics of bolts in the design stage to ensure that the connection strength can meet the design requirements, so as to ensure the safety and reliability of the connection structure. [0003] At present, the bolt connection strength analysis is mainly based on engineering algorithms, which are...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 褚景春袁凌宁红超潘磊董健李强林明张坤
Owner GUODIAN UNITED POWER TECH
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