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Low-temperature ultrasonic vibration fatigue experiment system

An ultrasonic vibration and fatigue experiment technology, which is applied in the direction of analyzing solids, analyzing materials, and instruments using sound waves/ultrasonic waves/infrasonic waves, can solve problems such as inability to accurately simulate fatigue loading, and achieve reduced environmental temperature unevenness, uniform temperature, and reduced The effect of energy consumption

Active Publication Date: 2016-04-20
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The existing ultrasonic vibration fatigue test system cannot perform accurate simulation of fatigue loading under low temperature environmental conditions. The present invention provides a low temperature ultrasonic vibration fatigue test system

Method used

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  • Low-temperature ultrasonic vibration fatigue experiment system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Such as Figure 1 to Figure 4 As shown, a low-temperature ultrasonic vibration fatigue experiment system includes a piezoelectric transducer 1 and an ultrasonic signal generator 17. The electrical energy input end of the piezoelectric transducer 1 and the alternating current signal output end of the ultrasonic signal generator 17 Electrically connected, a test piece 4 is connected to the mechanical vibration output end of the piezoelectric transducer 1;

[0038] It also includes a low-temperature box, the low-temperature box is a closed box structure, the test piece 4 is located in the low-temperature box, a cooler 8 is also provided in the low-temperature box, and a cooling device 15 is also provided outside the low-temperature box, so The cooling device 15 is connected to the cooler 8 through a pipeline;

[0039] The cooler 8 has a spiral disk tubular structure, and the reciprocating direction of the test piece 4 is located on the axis of the spiral disk tubular structure...

Embodiment 2

[0047] Such as Figure 1 to Figure 4 As shown, this embodiment is further limited on the basis of Embodiment 1: Since no matter single crystal or ceramic material is used in the existing piezoelectric transducer 1, the mechanical deformation displacement obtained is very small, such as only a few microns, In order to amplify the above displacement and obtain a more accurate measurement value, a displacement amplifier 2 is also connected to the mechanical vibration output end of the piezoelectric transducer 1, and the test piece 4 is connected to the displacement amplifier 2. The displacement amplifier 2 realizes the amplification of vibration displacement based on the different displacements of different parts during resonance. The more commonly used shapes are: exponential, conical, stepped displacement amplifier2.

[0048] Since the piezoelectric transducer 1 and the displacement amplifier 2 both generate heat during operation, in order to avoid or reduce the influence of the ...

Embodiment 3

[0054] Such as Figure 1 to Figure 4 As shown, this embodiment is further limited on the basis of any one of the technical solutions provided in the above embodiments: in order to enable the system to realize the vibration fatigue test of the specimen 4 in a low temperature and vacuum environment, and realize vacuum insulation at the same time, which is beneficial to isolation Thermal effect to improve the temperature control accuracy of the test piece 4 and obtain more accurate low-temperature vibration fatigue test values. The low-temperature box is also provided with a vacuum interface 14 which is connected to the outside of the low-temperature box through a pipe The vacuum pump 16. This solution also has the purpose of reducing the amount of cooling medium and reducing energy consumption.

[0055] As a specific implementation scheme for improving the experimental efficiency of the system, the ultrasonic signal generator 17 is an ultrasonic signal generator that can output an...

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Abstract

The invention discloses a low-temperature ultrasonic vibration fatigue experiment system. The low-temperature ultrasonic vibration fatigue experiment system comprises a piezoelectric transducer and an ultrasonic signal generator. The electric energy input end of the piezoelectric transducer is electrically connected with the alternating current signal output end of the ultrasonic signal generator, and the mechanical vibration output end of the piezoelectric transducer is connected with a test piece. A cryogenic box is further included and is of a closed box body structure, the test piece is located in the cryogenic box, a cooler is further arranged in the cryogenic box, a cooling device is further arranged outside the cryogenic box, and the cooling device is connected with the cooler through a pipeline. The cooler is of a spiral-coil-shaped structure, and the reciprocating direction of the test piece is located on the axis of the spiral-coil-shaped structure. A convection fan arranged in the cryogenic box is further included, and the axis of the convection fan is collinear with the axis of the spiral-coil-shaped structure. According to the system, a low-temperature vibration fatigue loading experiment can be efficiently conducted on the test piece.

Description

Technical field [0001] The invention relates to the technical field of fatigue test equipment, which is used for testing the fatigue performance of materials under low-temperature environmental conditions, and particularly relates to a low-temperature ultrasonic vibration fatigue test system. Background technique [0002] Due to the low-temperature brittleness of metal materials, mechanical equipment and components related to low-temperature environmental conditions can easily lead to low-temperature fatigue failure under alternating loads below room temperature. The lowest temperature in winter can reach -30℃ in cold northern regions, and it can reach -80℃ in winter in the north and south poles of the earth. In life and production, there are many machinery and equipment parts that work in low temperature environments, such as cars, large oil tankers, icebreakers, and high-speed railways operating in the north. Some parts have to withstand 10 7 The above cycle load can accurately...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/04
CPCG01N29/04G01N2291/0234G01N2291/02827
Inventor 李久楷王清远刘永杰
Owner SICHUAN UNIV
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