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Prediction method for high-cycle fatigue performance of metal material under different temperature conditions

A technology of high cycle fatigue and temperature conditions, applied in the fields of instrumentation, calculation, electrical and digital data processing, etc., can solve the problems of reducing the service safety of components, increasing the service cost of components, and laboriousness, reducing the test volume requirement and high applicability. , the effect of good applicability

Active Publication Date: 2019-07-30
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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Problems solved by technology

[0003] Because fatigue testing, especially high-temperature fatigue testing, is time-consuming, labor-intensive, and expensive, if comprehensive and accurate fatigue data or fatigue performance cannot be used to predict the constitutive relationship in the design and preparation of components, the service cost of components will be greatly increased and the service safety of components will be reduced. , and cause irreparable losses

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  • Prediction method for high-cycle fatigue performance of metal material under different temperature conditions
  • Prediction method for high-cycle fatigue performance of metal material under different temperature conditions
  • Prediction method for high-cycle fatigue performance of metal material under different temperature conditions

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Embodiment 1

[0046] This embodiment is to predict the performance of vermicular graphite cast iron material in high cycle fatigue working condition, the specific process is as follows:

[0047] First, the vermicular graphite cast iron material is taken from the diesel engine cylinder head, and the temperature range of the high-cycle fatigue condition is determined to be 25 (room temperature)-500°C according to the service condition.

[0048]Second, choose three typical temperatures: 25, 400 and 500°C; the fatigue strength test method chooses the lifting method, the stress amplitude increase and decrease is 10MPa, and the fatigue test is in accordance with GB / T 3075-2008 Metal material fatigue test axial force control method The calculation of fatigue strength is carried out according to the statistical scheme and analysis method of fatigue test data of metal materials in GB / T24176-2009. The schematic diagrams of three typical temperature S-N curves are as follows: figure 2 .

[0049] Th...

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Abstract

The invention discloses a prediction method for high-cycle fatigue performance of a metal material under different temperature conditions, and belongs to the technical field of material science and engineering application. The method comprises the following steps: firstly, carrying out a high-cycle fatigue test at different temperatures to obtain S-N curve; establishing the relationship between the fatigue strength coefficient alpha'f and the temperature T and the relationship between the fatigue strength index b and the temperature T through Basquin relationship fitting, and obtaining relatedparameters; substituting the established relationship into a Basquin equation to establish a quantitative relationship among the stress amplitude alpha a, the fatigue life Nf and the temperature so as to predict the high-cycle fatigue performance of the metal material at different temperatures. According to the method, through a small amount of high-cycle fatigue test, S- N curve and the fatiguestrength are efficiently and accurately predicted under a continuous temperature.

Description

technical field [0001] The invention relates to the technical field of high-cycle fatigue performance testing of metal materials, in particular to a method for predicting high-cycle fatigue performance of metal materials under different temperature conditions. Background technique [0002] Automobiles, trains, ships, and airplanes are the staples of modern transportation. Among them, automobiles have become the first choice for daily transportation because of their flexibility, speed and convenience. At present, the automobile transportation industry is facing problems such as rapid growth in transportation demand, depletion of fossil energy and rising fuel prices. Improving the power per unit volume or power per unit mass of internal combustion engines, that is, power density, is an effective way to solve this problem. As the heart of automobiles, the current research focus on internal combustion engines is to improve power density and reliability, reduce emissions, and im...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F2119/04G06F2119/08G06F30/20Y02P90/30
Inventor 庞建超朱刚王猛李守新张哲峰
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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