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Calculating method of ultimate strength checking of connection of flange and bolt

A technology for connection bolts and ultimate strength, which is applied in the calculation field of flange connection bolt ultimate strength check, can solve problems such as the safety of fan connection bolt strength, achieve simple and easy calculation process, speed up calculation convergence speed, and improve calculation accuracy Effect

Inactive Publication Date: 2013-10-16
CHINA CREATIVE WIND ENERGY +3
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Problems solved by technology

It is calculated by finite element analysis software to solve the problem of strength and safety of fan connecting bolts

Method used

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  • Calculating method of ultimate strength checking of connection of flange and bolt
  • Calculating method of ultimate strength checking of connection of flange and bolt

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Embodiment

[0021] Embodiment: The calculation method of the present invention adopts ANSYS (finite element analysis software) as the implementation tool. This example uses the method of checking the ultimate strength of the flange connection bolts at the bottom of a fan tower for specific description. The flange connection structure is as follows: figure 1 As shown, its calculation method includes the following steps:

[0022] The first step: establish the geometric model of the flange bolt connection structure: use the solid model in ANSYS software to establish the upper and lower flanges 2 and 4, part of the tower structure, high-strength washer 5, nut 6 and nut 1 of high-strength bolts , where the upper and lower flanges 2, 4, and part of the tower structure form an integrated model; use line elements to build the screw rod 3 part of the high-strength bolt.

[0023] Step 2: Carry out finite element meshing for the geometric model of the flange bolted connection structure: see Table 1 ...

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Abstract

The invention provides a calculating method of ultimate strength checking of connection of a flange and a bolt. The method comprises the following steps: sampling a finite element analysis software as a platform to conduct modeling, conducting mesh generation with a finite element, setting load of a connection structure and boundary conditions, and conducting calculation to obtain the stress condition of the bolt, wherein the setting of the load of the connection structure and the boundary conditions is particularly as follows: the relation between an upper flange and a lower flange is the standard friction contact relation in a model; a high strength gasket and a bolt nut, and a high strength gasket and a bolt screw cap are connected by adopting a conode way; the high strength gasket and the upper flange, and the high strength gasket and the lower flange are connected by adopting a binding contact manner; the structural node space coordinates system of a tower cylinder restraining the bottom end of the lower flange is the degree of freedom in three directions of X, Y, and Z; a node is built in the center of the upper flange, and is connected with the top end of a tower cylinder model by multipoint restriction of a beam element, and an ultimate working condition load is applied in the center of the upper flange; each connection bolt applies bolt pretension force. The bolt stress intensity and danger positions calculated by the method are higher in accuracy.

Description

technical field [0001] The invention belongs to the technical field of wind power generation, and in particular relates to a calculation method for checking the ultimate strength of flange connection bolts, which is a more general method for checking the flange connection bolts of fan tower tubes and can be widely used in fans of various structures Check the ultimate strength of the tower flange connection bolts. Background technique [0002] At present, the megawatt-level wind turbine tower mainly adopts a steel tower-type conical tower, and each section of the tower is connected by steel flanges and high-strength bolts. The safety of connecting high-strength bolts is directly related to the safety of the entire unit. In engineering, the Petersen Method (Petersen Method) is generally used to check the ultimate strength of the tower connecting bolts. The Petersen method does not consider the effect of bolt preload on deformation. The bolts are modeled with springs only an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 栗荫帅刘衍选蔡晓峰赵炳胜
Owner CHINA CREATIVE WIND ENERGY
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