Method for testing high-temperature fretting fatigue life of tenon joint structure

A connection structure and fretting fatigue technology, which is applied in the direction of testing material strength by applying repetitive force/pulsation force, testing material strength by applying stable tension/pressure, and measuring devices, etc. It achieves good economy and simple and easy implementation , Accurately predict the effect of high temperature fretting fatigue life

Active Publication Date: 2018-11-02
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the general method cannot be used to monitor the life of tenon joint structures in high temperature fretting fatigue tests.

Method used

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  • Method for testing high-temperature fretting fatigue life of tenon joint structure
  • Method for testing high-temperature fretting fatigue life of tenon joint structure
  • Method for testing high-temperature fretting fatigue life of tenon joint structure

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Embodiment Construction

[0049] Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:

[0050] This invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, components are exaggerated for clarity.

[0051] Such as figure 1 As shown, a high-temperature fretting fatigue life test method of tenon joint structure, the specific steps are as follows:

[0052] Step 1): Determine the strain judgment method for the crack initiation life of the tenon and tenon-groove connection structure. Before the fretting fatigue cracks are initiated, the change of the peak strain value of the tenon / tenon-groove contact side wall 5 is relatively stable. As the fatigue cracks start to initiate , the pea...

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Abstract

The invention discloses a method for testing high-temperature fretting fatigue life of a tenon joint structure. The method for testing the high-temperature fretting fatigue life of the tenon joint structure comprises the following steps: determining strain or displacement of crack initiation, and installing test equipment; then starting a medium temperature fretting fatigue test; determining a judgment standard of the displacement and strain during crack initiation; and finally, performing a high-temperature fretting fatigue test and determining the high-temperature fretting fatigue life of the tenon joint structure. The fretting fatigue test of the tenon joint structure at the high temperature is successfully completed, and the test is low in cost and capable of simply and accurately acquiring the crack initiation life data of the tenon joint structure, so the method disclosed by the invention is high in operability, wide in application range and high in prediction accuracy and has considerable engineering application prospects. The invention further discloses a test-piece fixture for high-temperature fretting fatigue life test of the tenon joint structure. The fixture comprises an upper fixture with a water-cooling device, a lower fixture and a fixing assembly.

Description

technical field [0001] The invention relates to the field of fatigue life testing, in particular to a high-temperature fretting fatigue life testing method of a tenon connection structure. Background technique [0002] Fretting fatigue is a phenomenon that when two components are in contact under cyclic loads, tiny relative sliding occurs between the two contact bodies and the fatigue life of the components decreases. Existing studies have shown that under fretting conditions, the fatigue strength of parts can be reduced to 2 / 3 of the normal fatigue strength value or even lower. [0003] Fretting fatigue failures commonly occur in engineering applications, especially in the automotive, railway, energy, and aerospace fields. In aviation, common locations for fretting damage include lap joints in aircraft structures, tenon joints in turbofan engines. Existing studies have shown that on aero-engine blades, since the tenon and tenon-groove work in a high-temperature environmen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/18G01N3/38
CPCG01N3/18G01N3/38G01N2203/0073G01N2203/0226
Inventor 张宏建王楠崔海涛温卫东徐颖
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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