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Method for assessing ultra-high cycle fatigue strength and fatigue life of steam turbine rotor

A steam turbine rotor, fatigue life technology, applied in the field of steam turbines, to achieve the effect of accurate equivalent unidirectional symmetrical stress amplitude, which is not conducive to cost control

Active Publication Date: 2016-12-07
SICHUAN UNIV
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Problems solved by technology

However, so far, there is no suitable method for the calculation of high-temperature ultra-high cycle fatigue strength and fatigue life analysis of steam turbine rotors for engineering reference

Method used

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  • Method for assessing ultra-high cycle fatigue strength and fatigue life of steam turbine rotor
  • Method for assessing ultra-high cycle fatigue strength and fatigue life of steam turbine rotor
  • Method for assessing ultra-high cycle fatigue strength and fatigue life of steam turbine rotor

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Embodiment

[0038] figure 1 It is a schematic flow chart of a steam turbine rotor ultra-high cycle fatigue fatigue strength and fatigue life evaluation method according to an embodiment of the present invention. The steam turbine rotor ultra-high cycle fatigue fatigue strength and fatigue life evaluation method includes:

[0039] Step S11, according to and Obtain the average stress and the stress amplitude of the high temperature dangerous point on the rotor component, where, σ m is the average stress at the high temperature danger point, σ a is the stress amplitude of the high temperature danger point, σ max is the maximum stress at the high temperature danger point, σ min is the minimum stress at the high temperature danger point.

[0040] Specifically, under the action of its own gravity, the high-temperature dangerous point on the rotor component rotates to the lower surface (that is, the 270° position at the bottom of the rotor component) to receive the maximum stress, and the ...

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Abstract

The invention discloses a method for assessing ultra-high cycle fatigue strength and fatigue life of a steam turbine rotor. The method comprises the following steps of: obtaining mean stress of high-temperature dangerous points and stress amplitude of the high-temperature dangerous points on a rotor component according to sigma<m>=(sigma<max>+sigma<min>) / 2 and sigma=(sigma<max>-sigma<min>) / 2; obtaining an ultra-high cycle fatigue S-N curve of the rotor component; obtaining fatigue strength corresponding to a service period of the rotor component according to the ultra-high cycle fatigue S-N curve of the rotor component; obtaining an equivalent unidirectional symmetric stress amplitude of on-load stable operation of the rotor component according to sigma<ea>=sigma+(sigma<m>*sigma<-1D>) / sigma<Creep>; determining an allowable security coefficient of the rotor component; checking the ultra-high cycle fatigue strength of the rotor component according to the allowable security coefficient of the rotor component; and calculating a security fatigue life and an ultra-high cycle fatigue life loss of the rotor component. The method for assessing the ultra-high cycle fatigue strength and fatigue life of the steam turbine rotor can realize the quantitative calculation and assessment of the high-temperature ultra-high cycle fatigue strength, fatigue life and loss.

Description

technical field [0001] The invention relates to the technical field of steam turbines, in particular to a method for evaluating the ultra-high cycle fatigue fatigue strength and fatigue life of a steam turbine rotor. Background technique [0002] During the service period, the steam turbine rotor not only bears the low cycle fatigue load caused by thermal stress, but also bears the ultra-high cycle fatigue load caused by the gravity of the rotor and blades under high temperature environment. For a steam turbine at full speed, the fatigue cycle loading frequency is 50Hz. If it is calculated based on an average annual operation of 8000 hours, then in the 30-year service period, the ultra-high cycle fatigue cycle is as high as 4×10 10 Weeks, well beyond the regular 1×10 7 The design range of cycles is a typical high-temperature ultra-high cycle fatigue failure problem. The value of ultra-high cycle fatigue load is relatively small, far below the yield limit, so it can often b...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/23
Inventor 李久楷王清远刘永杰张宏谢少雄侯方
Owner SICHUAN UNIV
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