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Method for evaluating fatigue strength of full-size component by using miniature sample test

A fatigue-strength, full-scale technology, applied in the field of miniature specimen test to evaluate the fatigue strength of full-scale components, can solve the problems of long cycle, unfavorable development and evaluation of mechanical products, and lack of rigor.

Pending Publication Date: 2021-08-31
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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Problems solved by technology

This will lead to two problems: too much fatigue test will lead to higher test cost and longer test cycle, which is not conducive to the development and evaluation of mechanical products; it is not rigorous to blindly assume that the structural fatigue notch effect and the material fatigue size effect are independent of each other. In fact, the relationship between the two should be negatively correlated
In addition, the cost of the test bench is too high and the efficiency is low. Sometimes, the equipment construction time will be longer than the test time. Even if the bench is built, the test frequency is limited to a very low level by the actuator.
Therefore, the current structural fatigue strength evaluation method is high in cost, low in efficiency and poor in accuracy.

Method used

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  • Method for evaluating fatigue strength of full-size component by using miniature sample test
  • Method for evaluating fatigue strength of full-size component by using miniature sample test
  • Method for evaluating fatigue strength of full-size component by using miniature sample test

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Embodiment 1

[0048] This embodiment is to evaluate the rotational bending fatigue strength of the full-scale moving axle DZ2 through the miniature sample test, and the evaluation process is as follows figure 1 As shown, the specific process is as follows:

[0049] 1. Simulation of stress distribution state of full-scale components

[0050] In the ABAQUS finite element analysis software, the full-scale DZ2 train axle was modeled three-dimensionally, divided into meshes, and the boundary conditions under the most severe working conditions were set, and the force state of the full-scale components was analyzed by the finite element method. The results are shown in figure 2 .

[0051] 2. Determination of weak areas of fatigue performance of full-scale components:

[0052] According to the results of finite element analysis (see figure 2 ), it can be seen that the area of ​​maximum stress is the unloading groove, therefore, the most dangerous area is determined to be the unloading groove. ...

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Abstract

The invention relates to a method for evaluating fatigue strength of a full-size component by using a miniature sample test, and belongs to the technical field of structural fatigue strength evaluation. According to the method, based on a general consensus that fatigue cracks are generated in the weakest link of a component, the stress state of the most dangerous working condition of the full-size component is simulated through finite element simulation, and the weakest link of the component is determined; and a series of miniature samples which are scaled down in equal proportion is designed and the fatigue strength of the miniature samples under the bending fatigue load is detected; finally, the bending fatigue size effect rule is converted into the fatigue strength size effect rule of the component under any cyclic load through average stress correction, and then the fatigue strength of the full-size component is predicted. The method has the advantages of cost saving, test efficiency improvement, high precision and simple application, and can be widely applied to prediction of the fatigue strength of the metal material component.

Description

technical field [0001] The invention relates to the technical field of structural fatigue strength evaluation, in particular to a method for evaluating the fatigue strength of a full-scale component by using a miniature sample test. Background technique [0002] Fatigue is the main failure mode of mechanical structural components, and the consequences are the most serious. Structural fatigue strength is an important index for structural fatigue design or evaluation. At present, there are mainly two methods for evaluating structural fatigue strength: the fatigue strength test of material standard specimens to predict the structural fatigue strength; the component bench test to test the structural fatigue strength. [0003] However, the material fatigue strength is different from the structural fatigue strength, and the material standard sample cannot reflect the influence of size difference and structural shape on the structural fatigue strength, and the influence of these f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/17G06F30/23G01N3/32G01N3/02G06F119/14
CPCG06F30/17G06F30/23G01N3/32G01N3/02G06F2119/14G01N2203/0023G01N2203/0073G01N2203/0075Y02T90/00
Inventor 白鑫张鹏张哲峰
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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