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Material shearing fatigue property testing method

A fatigue performance testing, fatigue testing machine technology, applied in the direction of analyzing materials, using repetitive force/pulse force testing material strength, measuring devices, etc., can solve problems such as inability to popularize, sample fracture, stress concentration, etc., and achieve excellent technical results. , easy operation, low cost effect

Pending Publication Date: 2019-07-19
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this device has great limitations. It is only suitable for samples with a bolt structure. Moreover, due to the thread structure on the surface of the bolt, a gap must be introduced, which will cause stress concentration when the force is applied, resulting in early fracture of the sample. Therefore, this The sample of this kind of thread cannot be extended to other more general working conditions
[0005] In actual engineering, a simple and effective method is needed to measure the shear fatigue performance of materials, but there is no feasible method at present. test method

Method used

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  • Material shearing fatigue property testing method

Examples

Experimental program
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Effect test

Embodiment 1

[0046] A material shear fatigue performance test method, which uses a special shear fatigue device for material shear fatigue performance testing; the hardness of the material used in the shear fatigue device is required to be no less than 500HV; that is, under alternating shear load During the loading process, the shearing device is rigid without macro-elastic deformation;

[0047] The overall structure of the shear fatigue device is as follows: the middle part is a large cylinder structure, and the two ends are small cylinders A10 and B11. Small cylinders A10 and B11 are the clamping ends of the testing machine of the shear fatigue device; Coaxial overall structure; among them: the shear fatigue device of the overall structure is divided into two parts: upper shear couple 1, lower shear couple 2; upper shear couple 1, lower shear couple 2 are centrally symmetrical structures And they are combined in a centrally symmetrical form into a whole arrangement; the joint surface betwee...

Embodiment 2

[0072] Shear fatigue devices such as Figure 1-7 The device includes an upper shear couple 1 and a lower shear couple 2 installed on the fatigue testing machine. The upper and lower shear couples are cut from a revolving body with a large middle cylinder and small cylinders at both ends. Upper shear couple 1 includes small cylinder A10, fixed bolt A3, upper movable cutting blade 6, movable chamber A12 and sample slot 9 and other structures; lower shear couple 2 includes small cylinder B11, fixed bolt B4 and bolt C5, and lower movable Shearing blade A7 and lower movable shearing blade B8, movable bin B13, movable bin C14 and sample tank 9 and other structures. The movable bin and sample tank of the upper and lower shearing couple are a matching combination. By tightening bolt A3, bolt B4 and bolt C5, the movable cutting edge can be firmly fixed on the sample, eliminating the gap between the sample and the shear fatigue device.

[0073] Shear fatigue samples, such as Picture 10 ,...

Embodiment 3

[0082] Ti-6Al-4V alloy is a dual-phase titanium alloy. With its high specific strength, excellent corrosion resistance and excellent comprehensive mechanical properties, it is widely used in aerospace, shipbuilding and other fields. Ti-6Al-4V alloy fasteners will be subjected to alternating shear forces under actual working conditions, and their failure mode is usually shear fatigue failure. Therefore, the determination of the shear fatigue performance of Ti-6Al-4V alloy fasteners has important engineering significance for its practical application.

[0083] Choose H11 steel as the material for shear fatigue device (hardness is 620HV), according to Figure 1-7 The size of the machining shear fatigue device is selected as follows: the width of the sample slot is 8mm and the thickness is 2mm. For Ti-6Al-4V alloy fasteners, follow Picture 10 Processing shear fatigue samples. The length of the sample is l=20mm, the width w=7mm, the thickness b=1.8mm, the surface roughness is not mo...

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Abstract

The invention discloses a material shearing fatigue property testing method. A dedicated shearing fatigue device is used, and the hardness of a material used by the shearing fatigue device is not lessthan 500HV; the method comprises the following steps: firstly assembling the shearing fatigue device and a sample, thereby enabling an upper movable shearing blade (6), a lower movable shearing bladeA (7) and a lower movable shearing blade B (8) to tightly fit with the sample; guaranteeing that the sample and the shearing fatigue device form an integrated structure, and enabling the section subjected to alternate shearing force effect to maintain unchanged; and fixing the shearing fatigue device loaded with the sample on a fatigue tester; setting load and frequency, and performing shearing fatigue experiment, thereby obtaining the shearing fatigue service of the material under the assigned stress. The bottleneck of the existing material shearing fatigue property testing method is brokenthrough, the device is simple, easy to operate, low in cost, wide in applicable range, and excellent in technical effect; and the expansion can be performed on this basis to obtain more extension applications. The testing method has expected huge economic value and social value.

Description

Technical field [0001] The invention relates to the technical scheme design and application technical field of material shear fatigue performance testing, and in particular provides a material shear fatigue performance testing method. Background technique [0002] In the prior art, in the field of material science, especially the engineering application of metal frames, "shear fatigue" refers to fatigue damage caused by alternating shear forces. In actual working conditions, many components such as bolts, solder joints, gears, rivets and link keys will be subjected to alternating shear forces. Measuring the shear fatigue performance of these components can give experimental evidence for engineering practice. [0003] In the testing practice of the prior art, the shear fatigue performance testing methods for materials are very limited, and the applicable objects of related methods are usually relatively single and not universal; and the shear fatigue performance measurement of gener...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/32G01N3/02G01N3/04
CPCG01N3/32G01N3/02G01N3/04G01N2203/0005G01N2203/0025G01N2203/0073G01N2203/0252G01N2203/0298G01N2203/0423
Inventor 李阁平袁福森刘承泽韩福洲张英东顾恒飞
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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