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Metal material high-low cycle fatigue full-strain-life curve test method

A technology of life curve, metal material

Active Publication Date: 2019-12-03
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method is not strain control, and the strain error of displacement conversion is relatively large, and the frequency of the digital acquisition system is limited, and it is difficult to collect a large amount of data completely
[0005] To sum up, the full strain-life curve of metal materials is the basic data necessary for the design of structural parts, but there is no unified regulation on its characterization methods and testing techniques in domestic and foreign standards and literature.

Method used

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  • Metal material high-low cycle fatigue full-strain-life curve test method
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  • Metal material high-low cycle fatigue full-strain-life curve test method

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Embodiment Construction

[0043] The implementation of the present invention will be described in detail below in conjunction with the examples of implementation, but they do not constitute a limitation of the present invention, and are only examples. At the same time, the advantages of the present invention will become clearer and easier to understand.

[0044] 1) In the low-cycle fatigue stage, when the cycle life of the sample is less than 100,000 times, the strain control of the extensometer is used to perform the fatigue test on the sample. According to the sample requirements of "Method", the fatigue sample with parallel parts should be processed, and the surface roughness of the sample should meet the requirements of the national standard. The fatigue test was completed on a hydraulic fatigue testing machine, and the strain levels were 1.6‰, 1.8‰, and 2‰. , 3‰, 5‰, 9‰, the low-cycle cycle life N corresponding to the strain amplitude is obtained at each strain level f ’ The number of effective d...

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Abstract

The invention discloses a metal material high-low cycle fatigue full-strain-life curve test method. The method comprises the steps of (1) carrying out a fatigue test on a sample by adopting strain control in a low cycle fatigue stage, (2) performing power function fitting with a low-cycle plastic strain amplitude delta epsilon p' / 2 and a low-cycle stress amplitude delta sigma' / 2 corresponding to each strain stage, (3) performing a fatigue test on the sample by adopting stress control in a high-cycle fatigue stage, (4) drawing an initial full-strain-life curve, and (5) calculating to obtain a fitted high-low cycle fatigue full-strain-life curve. According to the test method of the invention, the traditional high-cycle fatigue and low-cycle fatigue are represented by the full-strain-life curve in a unified mode, the application range is wider, and the accuracy is higher.

Description

technical field [0001] The invention relates to the testing of the mechanical properties of metal materials, in particular to a method for testing the high and low cycle fatigue full strain-life curves of metal materials. Background technique [0002] With the change of the structure design concept, more and more users request to provide a new fatigue performance characterization method of raw materials when designing the structure, which is named as the full strain-life curve in the present invention. The curve includes high-cycle fatigue characteristics under low stress and small strain and low-cycle fatigue characteristics under high stress and large strain, which unifies the high-cycle fatigue and low-cycle fatigue properties of the material, and is characterized by the strain-life curve. The traditional strain-life curve is mainly used to describe the low-cycle fatigue behavior of materials under high stress and large strain, and the high-cycle fatigue behavior of low s...

Claims

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Application Information

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IPC IPC(8): G01N3/36
CPCG01N3/36G01N2203/0005G01N2203/0048G01N2203/0073G01N2203/0075
Inventor 杜丽影刘冬凃应宏邝兰翔尚伦
Owner 武汉钢铁有限公司