Calculating method for fatigue strength checking of L-type flange connecting bolt and device

Abstract

The invention relates to a calculating method for fatigue strength checking of an L-type flange connecting bolt and a device and belongs to the technical field of wind power generation. The method comprises following steps: first, calculating the three-section line relationship between external applied load and a screw bolt; second, obtaining equivalent fatigue load of the screw bolt according to the three-section line relationship in combination with time sequence load; then obtaining equivalent fatigue stress of the screw bolt according to the stress area of the screw bolt; then calculating allowable fatigue stress of the screw bolt according to the cycle number corresponding to the equivalent fatigue load of the screw bolt and the S / N curve of the screw bolt, and comparing the equivalent fatigue stress of the screw bolt with the allowable fatigue stress to check of the fatigue strength of the bolt. According to the method of the invention, the equivalent fatigue load is obtained according to the three-section line relation in combination with time sequence load; the process is simple and is easy to realize so as to increase the efficiency; the method can be applied in checking the fatigue strength of L-type flange screw bolts of blower fan towers; the method and device have wide application.

Description

technical field [0001] The invention relates to a calculation method and a device for checking the fatigue strength of L-shaped flange connection bolts, belonging to the technical field of wind power generation. Background technique [0002] Nowadays, the support structure of large wind turbines generally adopts conical segmented towers, and the towers of each segment are connected by L-shaped flanges and bolts. The fatigue strength of the connecting bolts is closely related to the life of the entire unit. The fatigue strength of L-shaped flange connection bolts is generally calculated by stress spectrum. The calculation process is relatively complicated and the efficiency is low, and it usually needs to be processed by professional fatigue analysis software with high cost. Contents of the invention [0003] The object of the present invention is to provide a calculation method and device for checking the fatigue strength of L-shaped flange connection bolts, so as to solve...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a calculation method and device for checking the fatigue strength of L-shaped flange connection bolts, so as to solve the problems of complicated calculation process and low efficiency in the current L-type flange connection bolt fatigue strength check

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