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A Low Temperature Ultrasonic Vibration Fatigue Experimental System

A technology for ultrasonic vibration and fatigue experiments, applied in the direction of using sonic/ultrasonic/infrasonic waves to analyze solids, instruments, and materials. effect of temperature

Active Publication Date: 2018-07-31
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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  • A Low Temperature Ultrasonic Vibration Fatigue Experimental System
  • A Low Temperature Ultrasonic Vibration Fatigue Experimental System
  • A Low Temperature Ultrasonic Vibration Fatigue Experimental 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 test system includes a piezoelectric transducer 1 and an ultrasonic signal generator 17, the electric energy input end of the piezoelectric transducer 1 and the AC signal output end of the ultrasonic signal generator 17 Electrically connected, the mechanical vibration output end of the piezoelectric transducer 1 is connected to the test piece 4;

[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 arranged 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 is a spiral coil structure, and the reciprocating direction of the test piece 4 is located on the axis of the spiral coil structure;

[0040] It also includes a conv...

Embodiment 2

[0047] Such as Figure 1 to Figure 4 As shown, the present embodiment is further limited on the basis of Embodiment 1: since no matter whether 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 displacements to obtain more accurate measurement values, a displacement amplifier 2 is 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 fact that different parts have different displacements during resonance. The more commonly used shapes are: exponential, conical, and stepped displacement amplifiers.

[0048] Since the piezoelectric transducer 1 and the displacement amplifier 2 both have heat generation during work, in order to avoid...

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 this system to realize the vibration fatigue experiment of specimen 4 under low temperature and vacuum environment, and realize vacuum heat insulation at the same time, which is beneficial to the insulation Thermal effect, to improve the temperature control accuracy of the test piece 4, to obtain more accurate low temperature vibration fatigue test value, the vacuum interface 14 is also provided on the low temperature box, and the vacuum interface 14 is connected to a vacuum port located outside the low temperature box through a pipeline. 16 of vacuum pumps. This scheme 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 generat...

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Abstract

The invention discloses a low-temperature ultrasonic vibration fatigue experiment system, which includes a piezoelectric transducer and an ultrasonic signal generator. The electric energy input end of the piezoelectric transducer is electrically connected to the AC signal output end of the ultrasonic signal generator. The mechanical vibration output end of the piezoelectric transducer is connected to the test piece; it also includes a low temperature box, the low temperature box is a closed box structure, the test piece is located in the low temperature box, and the low temperature box is also provided with Cooler, the outside of the low temperature box is also provided with a cooling device, the cooling device is connected to the cooler through a pipeline; the cooler is a spiral coil structure, and the reciprocating direction of the test piece is located on the axis of the spiral coil structure ; It also includes a convection fan arranged in the low temperature box, the axis of the convection fan is collinear with the axis of the helical coil structure. This system can efficiently carry out low-temperature vibration fatigue loading experiments on specimens.

Description

technical field [0001] The invention relates to the technical field of fatigue test equipment, which is used for the fatigue performance test of materials under low temperature environment conditions, in particular to a low temperature ultrasonic vibration fatigue test system. Background technique [0002] Due to the existence of low-temperature brittleness of metal materials, mechanical equipment and components related to low-temperature environmental conditions can easily lead to low-temperature fatigue damage under the action of alternating loads below room temperature. The lowest winter temperature in the northern cold regions can reach -30°C, and the lowest winter temperature can reach -80°C in the Earth's North Pole and Antarctica. In life and production, many machinery and device parts work in low-temperature environments, such as automobiles, large oil tankers, icebreakers, and high-speed rails operating in the north. Some parts have to withstand 10000000000000000000...

Claims

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Application Information

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