Evaluation method of fatigue properties of metal materials

A technology for fatigue performance and metal materials, which is applied in the direction of analyzing materials, using repeated force/pulsation force to test the strength and strength characteristics of materials, etc. It can solve the problems of disregarding dispersion and no universal and feasible evaluation standards, etc., so as to achieve simple application , Evaluate the effect quickly

Active Publication Date: 2018-11-23
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing methods are all based on the premise of not considering the dispersion, and there is no universal and feasible evaluation standard

Method used

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  • Evaluation method of fatigue properties of metal materials
  • Evaluation method of fatigue properties of metal materials
  • Evaluation method of fatigue properties of metal materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] This example is to evaluate the fatigue performance of two cast aluminum alloys.

[0067] Conditions: Safety indicators are: confidence level 95%, survival rate 99%; life data are shown in Table 1 and Table 2; working stress is random load, and stress level obeys normal distribution σ max ~N(70,5 2 ), MPa.

[0068] Table 1 The service life of cast aluminum alloy ZL101A produced by Factory A

[0069]

[0070] Table 2 The service life of cast aluminum alloy ZL101A standard aluminum alloy produced by factory B

[0071]

[0072] The evaluation process is as follows:

[0073] 1. Fitting fatigue life law C-P-S-N curve:

[0074] Based on fatigue life data points [Life N i,j , stress S i ], statistics of each stress level S i The lifetime distribution under:

[0075] 1.1 According to the formula (1), calculate the median logarithmic life under each stress level μ i :

[0076]

[0077] For the cast aluminum alloy ZL101A produced by Factory A: take the life cor...

Embodiment 2

[0125] The difference from Example 1 is that the two metal materials to be evaluated are tested at different strains ε i Fatigue life under N i,j , then based on the fatigue life data points [N i,j , ε i ], statistics of each cyclic strain ε i life distribution, and fit the fatigue life law C-P-ε-N curve (curve 1 and curve 2) of two kinds of materials; in each test and calculation process, all adopt material strain to replace the stress level in embodiment 1 . The output evaluation results are the same as in Example 1.

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Abstract

The invention discloses an evaluation method of the fatigue properties of metal materials, and belongs to the technical field of material science and engineering application. The evaluation method ischaracterized in that based on material fatigue life data, a service working condition and safety indexes, a fatigue failure evaluation curve is developed, a safety region, a failure region and an intermediate region or an intersecting region can be divided by a stress/strain range, and the fatigue properties of different materials can be compared through calculation of equivalent safety area. According to a technology disclosed by the invention, the problems that the fatigue properties of different materials are scattered, and direct comparison cannot be carried out are solved; the new technology has the advantages that the evaluation is rapid and the application is simple, and can be widely applied to compare and evaluate the fatigue properties of different metal materials.

Description

technical field [0001] The invention relates to the technical field of material science and engineering application, in particular to a method for evaluating the fatigue performance of metal materials. Background technique [0002] Fatigue failure is one of the three common failure modes in engineering accidents. Materials with longer service lives tend to have greater resistance to fatigue failure. In engineering, this ability is also called fatigue performance, which is usually measured by the fatigue test of the sample, that is, the S-N curve test. However, for a group of samples, even if their composition, process, size, and shape are unified, the test result is not the only constant S-N curve, but a dispersive band of the S-N curve. Especially for engineering materials, this dispersion band will be wider. The comparison of the advantages and disadvantages of material fatigue fatigue performance needs to involve various situations that may occur between the dispersed ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/32
CPCG01N3/32G01N2203/0073G01N2203/0075
Inventor 白鑫张鹏田艳中张哲峰
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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