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A method for checking the fatigue strength of a flange connecting bolt

A technology for fatigue strength and connection bolts, which is applied in the field of checking the fatigue strength of flange connection bolts, can solve problems such as increasing calculation errors, and achieve the effect of accurate relationship, simple process and high precision of calculation results

Active Publication Date: 2019-05-07
大唐洱源风电有限责任公司
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Problems solved by technology

[0003]The Schmidt-Neuper method is based on the results of the bolt ultimate strength check based on the Petersen method, and only considers the influence of the two load components My and Fz on the bolt stress to calculate the bolt Fatigue damage further increases the calculation error

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  • A method for checking the fatigue strength of a flange connecting bolt

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Embodiment Construction

[0023] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0024] In this embodiment, Hypermesh is used for finite element preprocessing operation, Abaqus is used for unit load solution, and Bladed software is used for rainflow counting and damage accumulation calculation.

[0025] A method for checking the fatigue strength of flange connection bolts, comprising the following steps:

[0026] Step 1: Process the assembly of the flange connection structure in Hypermesh software to establish finite element modeling, in which the length of the tower prosthesis connected to the flange is not less than twice the outer diameter of the flange, the upper flange and The frictional contact relationship between the lower flange is set, the frictional contact relationship is set between the high-strength washer and the upper flange and between the high-strength washer and the lower flange, and the relationship between the h...

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Abstract

The invention belongs to the technical field of wind power generation, particularly relates to a method for checking the fatigue strength of a flange connecting bolt, and provides a method for checking the fatigue strength of a flange connecting bolt in order to overcome the defects in the prior art. The method is not only suitable for connecting bolts of the wind power tower flange, but also suitable for any flange bolt connecting structure, and calculation is more accurate. The method is characterized by comprising the steps of generating a solving file, obtaining a relational expression between the stress borne by each bolt and six load components, and calculating the fatigue damage of the bolts. According to the method, the flange connecting bolts of the wind turbine tower can be calculated, the flange connecting bolts of any structural form can be calculated, and the application range is very wide. According to the method, the influence of all load components on the fatigue life of the bolt is considered, and the obtained relationship between the stress and the load of the bolt is more accurate. The theory principle is clear, the process is simple, implementation is convenient, and the calculation result precision is higher.

Description

technical field [0001] The invention belongs to the technical field of wind power generation, and in particular relates to a method for checking the fatigue strength of flange connection bolts. Background technique [0002] At present, the towers of wind turbines mostly adopt two forms of hybrid towers consisting of all-steel towers and concrete towers-steel towers. The steel towers of all-steel towers and hybrid towers are composed of steel towers. The steel towers are connected by steel flanges and high-strength bolts. Whether the flange connection bolts are safe or not is directly related to the life and death of the whole unit. The Schmidt-Neuper method based on the Petersen method is generally used in the fatigue strength check engineering of flange connection bolts. Because the Petersen method does not consider the influence of the pretightening force on the bolt deformation, and does not consider the influence of the bending moment on the bolt, only Applicable to L-...

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Application Information

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IPC IPC(8): G06F17/50
CPCY02E10/72
Inventor 邢春雷严素欣李云龙
Owner 大唐洱源风电有限责任公司
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