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A single chuck type fretting fatigue test device suitable for high temperature

A technology of fretting fatigue and test equipment, applied in the direction of measuring equipment, using applied stable tension/compression to test material strength, instruments, etc.

Active Publication Date: 2022-04-22
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since there are too many shape variables of the fretting bridge, such as fretting bridge height, bridge foot height and bridge spacing

Method used

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  • A single chuck type fretting fatigue test device suitable for high temperature
  • A single chuck type fretting fatigue test device suitable for high temperature
  • A single chuck type fretting fatigue test device suitable for high temperature

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The invention provides a single chuck type fretting fatigue test device suitable for high temperature, which includes a high temperature furnace heating assembly, a stress ring loading assembly, an upper and lower fixture assembly, and a test object; the stress ring loading assembly includes a stress ring, a bolt and nuts, there are threaded holes in the front and back of the stress ring, and two bolts pass through the threaded holes in the front and rear of the stress ring and cooperate with them. The fretting fatigue test device also includes a centering device and a fretting pad. The test object and the fretting pad are placed Between the two bolts, tighten the bolts to provide the bolt pre-tightening force to compress the fretting pad, so as to apply a load to the test object; the centering device has a slot hole to penetrate the test object, and the centering device and the test object are fixed on the upper and lower fixture components On the front and back of the ...

Embodiment 2

[0039] Such as figure 1 As shown, a single chuck type fretting fatigue test method suitable for high temperature, the specific steps are as follows:

[0040] S1: Fix two crossbars on the two columns of the fatigue testing machine, place the lower furnace body 13 of the high-temperature furnace heating assembly 1 on the crossbars; put the test object 5, the upper and lower clamps 32 and the centering device 4 with bolts 22 cooperate. Turn on the fatigue testing machine, clamp the upper clamp 31 with the upper clamp, adjust the height of the upper clamp of the testing machine, so that the test object 5 and the clamp pass through the inner chamber of the lower furnace body 13, extend into the lower clamp and use the lower clamp Head clamping lower fixture 32;

[0041]S2: The stress ring 21 is placed on the lower furnace body 13 in advance, and the bolt 22 is tightened with a wrench to apply a lateral load to the test object 5. The bolt 22 is jacked into the centering device 4 a...

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Abstract

The invention discloses a single chuck type fretting fatigue test device suitable for high temperature, which comprises a high-temperature furnace heating component, a stress ring loading component, an upper and lower clamp component, a centering device, a test object and a fretting pad, the stress ring The loading assembly includes a stress ring, bolts and nuts. There are threaded holes in the front and back of the stress ring. Two bolts pass through the threaded holes in the front and back of the stress ring and cooperate with them. The pre-tightening force of the bolts is used to compress the fretting pad, thereby applying a load to the test object. The centering device has slot holes to penetrate the test object. The centering device and the test object are fixed on the upper and lower fixture components. The front and rear through holes of the centering device, The hole is composed of a rectangular hole and a circular hole. The micro-movement pad is inserted into the hole. The rectangular hole just clamps the micro-motion pad, and then the bolt is jacked through the circular hole, so that the micro-motion pad can only be moved horizontally. The upward movement limits the displacement of the micro-movement pad in other directions.

Description

technical field [0001] The invention relates to a fretting fatigue test device, in particular to a single chuck type fretting fatigue test device suitable for high temperature, which belongs to the field of fretting fatigue life testing. 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 t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/18G01N3/02G01N3/06
CPCG01N3/18G01N3/02G01N3/06G01N2203/0073G01N2203/0226G01N2203/0254G01N2203/0682
Inventor 张宏建吴博伟崔海涛温卫东徐颖
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS