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Broadband fatigue testing machine

A fatigue testing machine and broadband technology, applied in the field of testing, can solve the problems of large displacement, small loading force, small displacement, etc., and achieve the effect of large displacement and providing displacement

Inactive Publication Date: 2016-10-26
SUZHOU DONGLING VIBRATION TEST INSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The hydraulic fatigue testing machine has a large displacement, and the frequency can range from DC to dozens of hertz or even hundreds of hertz. However, due to the technical blockade of the large-flow servo valve, the hydraulic fatigue machine with high thrust cannot realize the movement of hundreds to thousands of hertz. loaded, and the oil source volume is large
The piezoelectric fatigue testing machine uses piezoelectric elements as the driving force source. Although the frequency can reach tens of thousands of hertz, it acts on the test piece after conversion by the piezoelectric effect of the piezoelectric element, so the displacement is small and the load Little power

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] see figure 1 , as shown in the legend therein, a broadband fatigue testing machine includes a loading beam 100, a driving source 200 arranged below the loading beam 100, an upper fixture 300 installed at the bottom of the loading beam 100, and an upper fixture 300 installed on the driving source The lower fixture 400 on the table of 200, the driving source 200 is mainly composed of an excitation head 210, a guide support shaft and a driving assembly. The guide support shaft includes an air spring 220 and a guide support shaft body 230 connected to the air spring 220 The above drive assembly includes a magnetizer 240, an iron core 250, a DC coil 260 and an AC coil 270, the iron core 250 is arranged in the inner cavity of the magnetizer 240 to form a magnetic channel, and the DC coil 260 is arranged around the inner wall of the magnetizer 240 In order to form a constant strong magnetic field in the above-mentioned magnetic channel, the AC coil 270 is arranged around the w...

Embodiment 2

[0038] see figure 2 , as shown in the legend, the rest is the same as the first embodiment, the difference is that the broadband fatigue testing machine in this embodiment adopts a double-layer DC coil 260 composed of a magnetic conductor 240, an iron core 250 and two layers of DC coils 260 arranged up and down. magnetic circuit system.

[0039] A double magnetic circuit structure is adopted, and the tail ends of the two sets of DC coils 235 are connected in series, and the directions of the currents flowing in are opposite.

Embodiment 3

[0041]The rest are the same as the first or second embodiment, except that the lifting cylinder is replaced by a motor.

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Abstract

The invention discloses a broadband fatigue testing machine including a loading cross beam, a driving source, an upper tooling fixture and a lower tooling fixture; the driving source is mainly composed of a vibration head, a guiding supporting shaft and a driving assembly; the driving assembly includes a magnetizer, an iron core, a direct current coil and an alternating current coil; the iron core is arranged in an inner cavity of the magnetizer to constitute a magnetic channel; the direct current coil is arranged in a groove in the inner wall of the magnetizer in a surrounding manner to form a constant strong magnetic field in the magnetic channel; the alternating current coil is arranged in a work gas gap between the inner wall of the magnetizer and the outer wall of the iron core in a surrounding manner to produce an alternating force; the guiding supporting shaft is arranged in the inner cavity of the iron core and has degree of freedom with up-and-down vibration; the vibration head is fixedly connected with the alternating current coil and the guiding supporting shaft. The driving source with alternating motion is used as a loading device for the fatigue testing machine, so that the output of large driving force can be ensured, large-displacement and full-frequency-band fatigue tests can also be provided, and thus the existing types of fatigue testing machines are substituted or supplemented.

Description

technical field [0001] The invention relates to the testing field, in particular to a broadband fatigue testing machine. Background technique [0002] With the rapid development of modern science and technology, national defense industry, instrumentation and other industries, new materials and new processes emerge in an endless stream, and the requirements for the safety and reliability of equipment components and their structures are also getting higher and higher. According to statistics, most of the failures of all equipment and components in use are caused by fatigue cracks in parts and components under dynamic loads, so fatigue testing is particularly important in material testing. Fatigue testing machine is one of the most important test equipment for determining the fatigue strength of materials, and is widely used in aerospace, automobile industry, rail transit, scientific research institutes and other fields. [0003] In recent years, the research and development o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/38G01N3/02
CPCG01N3/02G01N3/38
Inventor 吴国雄赵征仝宁可
Owner SUZHOU DONGLING VIBRATION TEST INSTR