A normal load loading device and method for fretting fatigue test
A technology of fretting fatigue and loading devices, which is applied to measuring devices, using stable tension/pressure to test material strength, instruments, etc., can solve the problems of simple structure of loading ring, small axial stiffness, and affecting test accuracy, etc., to achieve The effect of wide applicability, high axial rigidity and simple structure
Active Publication Date: 2020-12-29
BEIHANG UNIV
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Problems solved by technology
At present, most of the devices for applying normal force in fretting fatigue tests are loaded through hydraulic loading and loading ring. The normal load that can be applied by hydraulic loading is relatively large. The normal loads on the left and right sides can be the same, so the specimen may be subjected to additional bending moments, which will affect the test accuracy; although the loading ring loading can overcome this problem, because the structure of the loading ring itself is too simple, it cannot be applied Large normal load, and the loading ring is generally not axially fixed, so the axial stiffness is small
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[0018]The invention will be described in detail below with reference to the drawings and embodiments.
[0019]First of all, the entire device needs to be fixed to the fatigue testing machine through the columns on both sides of the fatigue testing machine.
[0020]Such asFigure 1-3As shown, the entire fretting fatigue normal load loading device of the present invention is divided into two parts: a fixed part and a load loading part;
[0021]The load loading part includes a micro-motion pad 2, a first clamping plate 3, a second clamping plate 4, a load cell 5, a load adjustment screw 6, a lock nut 12 and a shaft sleeve 13. The micro-motion pad 2 can be replaced according to different needs. The first clamping plate 3image 3 The two plates on the left and right are connected by four rods. The left plate has a groove on the right side for placing the micro-motion pad 2, and the right plate has a threaded through hole for installing the load adjustment screw 6, and the load adjustment screw 6 pa...
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The invention relates to a fretting fatigue test normal load loading device and method. The loading device is composed of two parts: a fixing part and a load loading part. Specifically, the loading device comprises fretting pads, a first clamping plate, a second clamping plate, a force sensor, a load adjustment bolt, a lock nut, limiting screws, positioning nuts, limiting nuts, sleeves, a fixing plate, fixing bolts, an inner fixing block and an outer fixing block. According to the device and the method, a fretting fatigue test can be carried out on a common fatigue test machine.
Description
Technical field[0001]The invention relates to the field of fretting fatigue testing, and in particular to a loading device and method for normal load in the fretting fatigue test of a standard specimen in a laboratory.Background technique[0002]The tenon joint structure is widely used in aero engine axial compressor, turbine and some other power machinery. Fretting fatigue will accelerate the initiation and propagation of cracks at the tenon joint and accelerate the failure of components. The disks and blades of the aero-engine compressor are widely made of titanium alloy, which is very sensitive to fretting fatigue.[0003]In order to study the fretting fatigue characteristics of materials, it is necessary to carry out fretting fatigue tests in the laboratory. Ordinary uniaxial fatigue testing machines cannot apply normal loads to standard specimens, so they cannot be directly used for fretting fatigue testing. At present, the fretting fatigue test is carried out either by a multi-axi...
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IPC IPC(8): G01N3/08G01N3/02
CPCG01N3/02G01N3/08G01N2203/0073
Inventor 胡殿印毛建兴倪卓慧曲震王荣桥
Owner BEIHANG UNIV