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A fretting fatigue test method and its testing machine with real-time adjustable contact load

A fatigue testing machine, fretting fatigue technology, applied in the testing of mechanical parts, the testing of machine/structural parts, the use of repetitive force/pulse force to test the strength of materials, etc., can solve the problem of small contact load application range and low control accuracy , low degree of automation, etc., to achieve the effect of high test and control accuracy, high degree of automation, and good repeatability

Inactive Publication Date: 2018-08-31
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these existing fretting fatigue testing machines have defects such as small application range of contact load, low control precision, and low degree of automation of the test, and none of them can realize real-time control of contact load

Method used

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  • A fretting fatigue test method and its testing machine with real-time adjustable contact load
  • A fretting fatigue test method and its testing machine with real-time adjustable contact load
  • A fretting fatigue test method and its testing machine with real-time adjustable contact load

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Embodiment Construction

[0043] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0044] A specific embodiment of the present invention is a fretting fatigue test method with real-time adjustable contact load:

[0045] First, the micro-motion support platform 7 is fixed on the support column 2 of the fatigue testing machine 6 by bolts, while ensuring that the left and right micro-motion support platforms 7 are horizontally aligned; then, the micro-motion device 8 is horizontally placed on the micro-motion support platform 7; Clamp one end of the tested specimen with the upper clamp 4 of the fatigue testing machine 6, and adjust the vertical sliding of the load-bearing beam 3 of the fatigue testing machine 6 and the front, rear, left, and right positions of the micro-movement device 8, so that the front end of the micro-movement pad 28 is in line with the tested specimen. The middle position of the test piece is ali...

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Abstract

The invention relates to a fretting fatigue testing method allowing a contact load to be adjusted in real time and a testing machine adopting the fretting fatigue testing method. The testing machine comprises an electronic-hydraulic servo fatigue testing machine, fretting supporting platforms, a fretting device and a computer testing and controlling system, wherein the fretting supporting platforms are fixed on supporting stand columns of the fatigue testing machine; the fretting device is horizontally arranged on the fretting supporting platform; the fatigue testing machine comprises an upper clamp and a lower clamp which are used for fixing a test piece; a contact load sensor, a motor drive signal and a displacement signal of the fretting device are connected with a computer data acquisition control system. Two fretting pad clamps are fixed in middles of two lead screw cross beams, and two opposite fretting pads are mounted at two ends of each fretting pad clamp. A fretting fatigue test with the contact load changing in real time is performed through the fretting fatigue testing machine, influences of the contact load on fretting fatigue damage are researched, meanwhile, fretting fatigue tests at different amplitudes and frequencies can be researched, and an experiment method is provided for deeper understanding of a fretting fatigue damage mechanism.

Description

technical field [0001] The invention belongs to the technical field of fretting fatigue test, and in particular relates to a fretting fatigue test method and a testing machine with real-time adjustable contact load. Background technique [0002] Fretting refers to the relative motion of extremely small amplitude (micron level) between the contact surfaces of two fastened components under the action of mechanical vibration, fatigue load, electromagnetic vibration or thermal cycle. Fretting fatigue is an important form of damage caused by fretting to materials. Compared with conventional fatigue, fretting can accelerate the initiation and expansion of cracks, which greatly reduces the fatigue life of components. The main reason for the failure of marine engineering, and the consequences of fretting are catastrophic. [0003] At present, although there are many studies on fretting fatigue, the research on fretting fatigue mainly focuses on the influence of the interaction of f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/36G01N3/38G01M13/00
Inventor 陈旭李建军陈刚
Owner TIANJIN UNIV
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