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A Method for Predicting the Fatigue Strength of Metal Materials by Tensile Test

A technology of fatigue strength and metal materials, applied in the direction of applying stable tension/pressure to test the strength of materials, analyzing materials, strength characteristics, etc., can solve the problem of not being able to obtain the weakest sliding resistance, etc., and achieve a simple method and convenient operation Effect

Active Publication Date: 2021-07-16
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for predicting the fatigue strength of metal materials through tensile tests, which is proposed based on the microscopic mechanism of the weakest sliding resistance, and solves the problem that the weakest sliding resistance cannot be obtained by stretching large samples

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  • A Method for Predicting the Fatigue Strength of Metal Materials by Tensile Test
  • A Method for Predicting the Fatigue Strength of Metal Materials by Tensile Test

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Embodiment 1

[0049] In this embodiment, a slender tensile sample is first prepared, and then the fatigue strength of the material is predicted through a tensile test. The target gauge section size of the prepared slender tensile sample is: 10 mm in length, 40 microns in width, and 40 microns in thickness.

[0050] First, two elongated tensile specimens were prepared using steps (a)-(e), and the specific preparation process was as follows:

[0051] (a) The initial sample is processed by wire electric discharge equipment, and the cross section of the initial sample is square. Sample 1 is made of maraging steel; each surface is polished with sandpaper to remove wire cutting marks; in order to achieve an ideal surface condition, the model of sandpaper is recommended to be No. 1200.

[0052] (b) According to the target size of the sample ( figure 1 ) and the density of the material to calculate the sample’s drop height h at the end of the free clamping end of the sample when the inclination angl...

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Abstract

The invention discloses a method for predicting the fatigue strength of metal materials through tensile tests, and belongs to the technical field of fatigue strength testing of metal materials. The method connects the fatigue strength of metal materials with the elastic limit in the tensile properties of slender samples, so that the fatigue properties with relatively complex testing processes can be predicted through the tensile properties with relatively simple testing processes. The method includes the following steps: (1) preparing at least two tensile samples meeting the requirements by electro-corrosion processing. (2) Measure the tensile curve of a tensile sample by a tensile testing machine, and obtain the elastic limit therefrom. (3) Use a tensile testing machine to carry out a tensile test on another sample, and stop stretching when the stretch reaches the elastic limit. (4) Observing the sample through a microscope, if the deformation is concentrated inside a certain grain, the elastic limit obtained by the tensile test is the predicted fatigue strength.

Description

technical field [0001] The invention relates to the technical field of fatigue strength testing of metal materials, in particular to a method for predicting the fatigue strength of metal materials through tensile tests. Background technique [0002] Fatigue performance is one of the important service performance indicators of materials. A material requires extensive fatigue testing before it can be applied to critical components. Among them, the test of fatigue strength is time-consuming and laborious. Therefore, how to predict the fatigue strength of materials through simple tensile tests has become a research hotspot. By summarizing the fatigue data of train axles, it is proposed that there is a linear relationship between fatigue strength and tensile strength. Specifically, the relationship is: the fatigue strength is 0.4 to 0.5 times the tensile strength (TóthL, Yarema SY. Formation of the science of fatigue of metals. Part 1.1825-1870, Mater. Sci., 2006, 42:673-80.)...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/08G01N1/28
CPCG01N1/28G01N3/08G01N2203/0017G01N2203/0073
Inventor 张鹏许自宽王斌周相海段启强张哲峰
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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