Normal loading device of fretting fatigue test system

A test system, fretting fatigue technology, applied in the direction of applying repetitive force/pulsation force to test the strength of materials, can solve the problems of low reliability, large error in test results, alternating deformation of samples, and achieve good test repeatability , high degree of automation, high reliability

Inactive Publication Date: 2015-04-29
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem is that during the test, the sample will alternately deform, causing the fretting pad to vibrate and the thread to loosen, resulting in a

Method used

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  • Normal loading device of fretting fatigue test system
  • Normal loading device of fretting fatigue test system

Examples

Experimental program
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Embodiment

[0024] figure 1 figure 2 As shown, a normal loading device of a fretting fatigue test system, its structural characteristics are:

[0025] The base 1 is threaded and fixed on the table of the tension-torsion multi-axis fatigue testing machine. Two transverse guide rails 2 are fixed on the upper surface of the base 1. The nut 6a of the lead screw 6 is installed on the right end of the base 1, and the screw of the lead screw 6 6b is connected to the right baffle plate 5 of the clamping mechanism through a ball bearing 7;

[0026] The concrete composition of described clamping mechanism is: the slider 3 on the bottom surface of the base plate 4 cooperates with the guide rail 2 on the base 1; the left and right ends of the base plate 4 are respectively fixed with a left baffle plate 26 and a right baffle plate 5; 26 and the right baffle 5 are connected by four guide rods 25; the right chuck 9 fits on the four guide rods 25 through the linear bearing 10, and a pressure sensor 8 ...

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PUM

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Abstract

The invention discloses a normal loading device of a fretting fatigue test system. The device adopts the scheme that a base is fixed on the table board of a tension torsion multi-axial fatigue tester through a thread; two transverse guide rails are fixed on the base; a nut of a lead screw is mounted at the right end of the base; a screw of the lead screw is connected with a right baffle plate of a clamping mechanism; the clamping mechanism is characterized in that a sliding block on the bottom surface of a bottom plate is matched with the guide rails on the base; a left baffle plate and a right baffle plate connected through four guide rods are fixed at the left and right ends of the bottom plate; a pressure sensor which is opposite to a pressure head of the right baffle plate is mounted in a groove on the right side of a right chuck; a right inching pad is arranged in an arc-shaped groove of the right chuck; an air cylinder is fixed on the left side of the left baffle plate; a piston rod of the air cylinder penetrates through the left baffle plate to be connected with a buffer block; the right side surface of the buffer block is opposite to the left side surface of a movement plate; the right side of the movement plate is connected with a left chuck through a three-dimensional sensor; a left inching pad is arranged in an arc-shaped groove of the left chuck. The normal load loaded by the test deice can preferably keep constant and the test result is more correct and reliable.

Description

technical field [0001] The invention relates to a test device for fretting fatigue in the field of mechanical engineering. Background technique [0002] Fretting (fretting) refers to the relative motion with extremely small amplitude ( Displacement amplitude is generally on the order of microns), that is, fretting occurs in mechanical parts that are "tightly" fitted. [0003] Fretting fatigue refers to the fatigue of the contact surface due to deformation caused by fretting. The fretting fatigue phenomenon mainly occurs in a variety of fittings with interference fit: such as the press fit of the rolling stock wheel axle, various fastening mechanisms and clamping mechanisms. These fatigue phenomena can be simplified experimental research using the contact model of horizontal cylinder (fretting pad) / vertical cylinder (sample) / horizontal cylinder (fretting pad) Two opposite extrusion lines on the sample in the interference fit). For the horizontal cylinder / vertical cylinder...

Claims

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Application Information

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IPC IPC(8): G01N3/36
Inventor 朱旻昊刘建华蔡振兵彭金方宋川徐志彪林晓锋
Owner SOUTHWEST JIAOTONG UNIV
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