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Method for predicting multi-axis constant-amplitude thermal mechanical fatigue life of notched part based on Kf method

A technology for thermo-mechanical fatigue and life prediction, which is applied in the directions of using a stable torsional force to test the material strength, using a stable shear force to test the material strength, and using a repetitive force/pulse force to test the material strength, etc. It can solve the problem of notched parts. The influence of fatigue life is different, etc., to achieve the effect of simple calculation method

Active Publication Date: 2021-07-13
BEIJING UNIV OF TECH
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Problems solved by technology

However, due to the different shapes and sizes of the notch, the impact on the fatigue life of the notch is significantly different, and under different temperature loading conditions, the same notch has different effects on the fatigue life

Method used

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  • Method for predicting multi-axis constant-amplitude thermal mechanical fatigue life of notched part based on Kf method
  • Method for predicting multi-axis constant-amplitude thermal mechanical fatigue life of notched part based on Kf method
  • Method for predicting multi-axis constant-amplitude thermal mechanical fatigue life of notched part based on Kf method

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Embodiment Construction

[0066] The specific embodiments of the present invention will be described with reference to the accompanying drawings.

[0067] The invention is further illustrated by the axial torsion constant amplitude thermomechanical fatigue test of notched parts, the test material is nickel-based superalloy GH4169, the test temperature is 360-650°C, the test adopts stress loading, and the loading waveform is triangular wave.

[0068] A method for predicting multi-axis constant-amplitude thermo-mechanical fatigue life of notched parts based on the Kf method, the specific embodiments are as follows:

[0069] Step (1): In the finite element simulation software, multiple groups of isothermal constant-amplitude axial torsion proportional loading are performed on the notched parts. The load spectrum is stress-controlled and the same, and each group has a different set temperature. The axial and torsional stress and strain of the root of the notched part under different temperature load condit...

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Abstract

The invention discloses a method for predicting the multi-axis constant-amplitude thermal mechanical fatigue life of a notched part based on a Kf method, and the method can consider the influence of a notch on the fatigue life under multi-axis constant-amplitude thermal mechanical loading, namely the influence of the notch on a damage mechanism, including the influence of the notch on fatigue damage, oxidative damage and creep damage. The fatigue notch coefficient Kf changing along with the temperature is calculated through the stress-strain history of the notch piece root under the multi-axis isothermal constant-amplitude load, the Kf changing along with the temperature is combined with the nominal stress load spectrum increment, and then the stress-strain history of the notch root is obtained through calculation. The comparison error between the prediction result of the multi-axis constant-amplitude thermal mechanical fatigue life of the notched part calculated by adopting the method and the test result is dispersed within 3 times of the band, which is of great significance to the accurate prediction of the life of an actual engineering component.

Description

technical field [0001] The invention belongs to the field of multiaxial thermomechanical fatigue strength theory, in particular to a method based on K f Method for Predicting Thermomechanical Fatigue Life of Notched Parts with Shaft Torsion and Constant Amplitude. Background technique [0002] In engineering applications, there are inevitably a large number of geometric discontinuities in various spacecraft, pressure vessels, and nuclear power plant equipment, such as gaps, holes, holes, etc. These gaps usually cause stress concentration. Moreover, under complex temperature environments and multi-axial mechanical loads, the position of the component notch often becomes a sensitive part of fatigue failure, and the high stress gradient caused by the notch promotes the local fatigue crack initiation of the component. Further lead to fatigue failure of components. Therefore, in order to predict the fatigue life of notched components more accurately, the effect of notches must ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/24G01N3/22G01N3/32
CPCG01N3/24G01N3/22G01N3/32G01N2203/0073G01N2203/0252
Inventor 尚德广陈烽李道航王海潮侯庚夏禹尹翔
Owner BEIJING UNIV OF TECH
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