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Ultrahigh-temperature high-frequency material mechanical property testing instrument and method

A technology of high-frequency materials and testing instruments, which is applied in the field of ultra-high-temperature and high-frequency material mechanical performance testing instruments, can solve problems such as long test periods, difficult simulation of extreme environments, and difficult loading of complex loads, so as to shorten fatigue test time and improve accuracy. Effects on Sex and Reliability

Active Publication Date: 2019-07-23
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide an ultra-high-temperature and high-frequency material mechanical performance testing instrument and method, which solves the problems in the prior art that complex loads are difficult to load, conventional fatigue test periods are long, and extreme environments are difficult to simulate

Method used

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  • Ultrahigh-temperature high-frequency material mechanical property testing instrument and method
  • Ultrahigh-temperature high-frequency material mechanical property testing instrument and method
  • Ultrahigh-temperature high-frequency material mechanical property testing instrument and method

Examples

Experimental program
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Effect test

Embodiment 1

[0054] The tensile / compressive properties of the C / C composites were tested at 1400°C. Before the test, clamp the cross-shaped test piece 9 made of C / C composite material, tighten the front cover 305 of the heating furnace and the rear cover 301 of the heating furnace with the quick tightening mechanism 303, calibrate the instrument, and check the sealing of each module Wait for the preparatory work; start the equipment, first carry out vacuum treatment to the sealed chamber of the heating furnace body 302, and after the vacuum degree reaches the requirement, pass the intermediate frequency current into the intermediate frequency induction heating device 8 to realize the heating of the graphite heating body 806, through the double ratio The color thermometer detects the temperature of the cross-shaped test piece 9, and when the test temperature in the gauge length area reaches 1400°C, the temperature is maintained through the temperature control system; Tensile / compressive tes...

Embodiment 2

[0056] High-frequency fatigue tests were performed on C / C composites at 1400°C. The difference from Example 1 is that after the gauge length area reaches the test temperature of 1400°C, the pre-stretching loading module is controlled to pre-stretch the cross-shaped specimen 9, and the cross-shaped specimen is maintained by the tension / compression loading unit 1. Stretch in the horizontal direction, start the high-frequency fatigue loading module 7 and control the frequency of fatigue loading to 20kHz, carry out high-frequency fatigue testing on the cross-shaped specimen 9, and use digital speckle technology to monitor the testing process through the perspective window of the front cover of the heating furnace. Real-time observation completed the fatigue test of the cross-shaped specimen 9 at a temperature of 1600°C.

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Abstract

The invention relates to an ultrahigh-temperature high-frequency material mechanical property testing instrument and method and belongs to the field of precision instrument testing. According to the method, a pre-stretching loading module is driven by two servo motors in the vertical direction and realizes adding of a stretching preload to a cross-shaped test piece in the vertical direction; a high-frequency fatigue loading module realizes a mechanical property test on a high-frequency fatigue material of the test piece based on the ultrasonic fatigue experiment principle; a stretching / compression loading module is driven by two horizontally-placed electric actuating cylinders and realizes adding of a stretching / compression complicated load to the cross-shaped test piece; and an ultrahigh-temperature loading module is provided with a low and medium-frequency inductive split heating furnace and realizes ultrahigh-temperature local loading in a test region of the test piece, wherein themaximum loading temperature can reach 1,600 DEG C. The testing instrument and method have the advantages that while a stretching / compression test is performed on the test piece, a high-frequency fatigue test and an ultrahigh-temperature loading environment are additionally arranged, so that the stretching / compression test and the high-frequency fatigue test of the material are more approximate toa real service environment, and the reliability and accuracy of a test result are improved.

Description

technical field [0001] The invention relates to the field of precision instrument testing, in particular to an ultra-high temperature and high frequency material mechanical property testing instrument and method. The present invention can provide ultra-high temperature and high frequency materials with tension / compression complex loads under vacuum, inert gas or local oxidation atmosphere, and at the same time use ultrasonic fatigue test technology to carry out high frequency fatigue tests of materials under the above complex loads and environments , to realize the test of material service performance under specific working conditions. Background technique [0002] In the field of aerospace, key components are used in extreme environments such as high temperature and high pressure, high-speed rotation, multiple stresses and complex loads. Although a large number of scientific researchers have devoted themselves to the study of material failure modes / mechanisms in extreme en...

Claims

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Application Information

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IPC IPC(8): G01N3/18G01N3/32
CPCG01N3/18G01N3/32G01N2203/0003G01N2203/0008G01N2203/0017G01N2203/0019G01N2203/005G01N2203/0055G01N2203/0073G01N2203/0085G01N2203/0208G01N2203/0226G01N2203/0647
Inventor 张建海赵宏伟陈俊先孟凡越孙书博万杰秦学志万文斗袁堂虎
Owner JILIN UNIV
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