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Method for predicting low-temperature ultrahigh-cycle fatigue life of high-strength steel

A technology for fatigue life prediction and high-strength steel, which is applied in the direction of testing material strength and strength characteristics by using one-time impact force, testing material strength by applying repeated force/pulsation force, etc. High-strength steel low-temperature ultra-high cycle fatigue life and other issues, to achieve the effect of economic advantages

Active Publication Date: 2020-04-21
FOSHAN UNIVERSITY
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Problems solved by technology

The impact of these two aspects of low temperature has a significant impact on the ultra-high cycle fatigue fracture mechanism and life of high-strength steel, but the current ultra-high-cycle fatigue life prediction of high-strength steel does not consider the parameters related to low temperature environment
Therefore, the current evaluation model cannot accurately evaluate the low-temperature ultra-high cycle fatigue life of high-strength steel

Method used

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  • Method for predicting low-temperature ultrahigh-cycle fatigue life of high-strength steel
  • Method for predicting low-temperature ultrahigh-cycle fatigue life of high-strength steel
  • Method for predicting low-temperature ultrahigh-cycle fatigue life of high-strength steel

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Embodiment 1

[0021] Taking 42CrMo steel as the research object, the high-strength low-temperature ultra-high-cycle fatigue life prediction method includes the following steps:

[0022] (1) Using the ultrasonic fatigue method to conduct ultra-high cycle fatigue tests on 42CrMo steel under a temperature environment of -20°C, the test frequency is 20kHz, and obtain material fatigue strength-life data;

[0023] (2) The impact energy of 42CrMo steel at different low temperatures (193K, 213K, 233K, 253K, 273K, 293K) are: 43, 56, 83, 112, 118, then the relationship between impact energy and temperature:

[0024] CNV=-433.39+3.467T-0.00531T 2 ;

[0025] (3) According to the relationship between material fracture toughness and impact energy, the relationship between fracture toughness and low temperature can be obtained;

[0026] K IC =14.6×(-433.39+3.467T-0.00531T 2 ) 0.5

[0027] (4) Use metallographic polishing method to measure the size of inclusions in high-strength materials a 0 =35.2u...

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Abstract

The invention discloses a method for predicting low-temperature ultrahigh-cycle fatigue life of high-strength steel. According to the method, a low-temperature ultrasonic fatigue test is adopted, parameters reflecting a low-temperature environment are introduced based on a fracture mechanics theory, a low-temperature ultra-high-cycle fatigue life equation of a material is established, and the ultra-high-cycle fatigue life of the high-strength steel in different low-temperature environments is quantitatively evaluated. The method avoids expensive, time-consuming and easily-damaged low-temperature ultrahigh-cycle fatigue tests, and has the advantages of simplicity, rapidness and economy.

Description

technical field [0001] The invention belongs to the technical field of non-ferrous metals, in particular to a method for predicting the fatigue life of high-strength steel at low temperature and ultra-high cycle. Background technique [0002] High-strength steel has the advantages of high strength, high toughness, and excellent formability, and is widely used in aeronautical structures, aeroengine compressor blades, and steam turbine blades. The high-strength steel structure bears high-frequency vibration fatigue loads during high-speed operation, and can withstand cyclic loads of up to 10 during long-term service. 9 Week times, that is, ultra-high cycle fatigue. For low temperature environment, the service temperature can reach -40℃. The research on ultra-high cycle fatigue of high-strength steel at service temperature has become a research hotspot in recent years, but there is no report on the prediction of its low-temperature ultra-high cycle fatigue life. [0003] Ult...

Claims

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Application Information

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IPC IPC(8): G01N3/00G01N3/32G01N3/18G01N3/30
CPCG01N3/00G01N3/32G01N3/18G01N3/30G01N2203/0008G01N2203/0003G01N2203/0012G01N2203/0017G01N2203/0073G01N2203/0067G01N2203/0228G01N2203/0252
Inventor 聂宝华陈东初蒙宇施斌卿杜小青
Owner FOSHAN UNIVERSITY
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