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Ultrasonic fatigue testing machine is a new generation of devices designed to perform VHCF tests in a very short time. The lifetime approach in fatigue design based on S_N curves establish an infinite life when the cyclic stress applied is below than the endurance limit. Results in this field revealed fatigue failures beyond 10e7 cycles, indicating that there´s no  endurance  fatigue  limit,  however  obtaining  this  data  with  servo-hydraulic  testing  machine  can  be  very  time-consuming and expensive.

Ultrasonic fatigue testing is one of a few methods which allow investigating fatigue properties in the ultra-high cycle region. The method is based on exposing the specimen to longitudinal vibrations on its resonance frequency close to 20 kHz. With use of this method, it is possible to significantly decrease the time required for the test, when compared to conventional testing devices usually working at frequencies under 200 Hz. Ultrasonic fatigue testing is a kind of accelerated resonance type fatigue test method, which can significantly reduce the test time and is the only available solution for aero-engine blade ultra-long life fatigue test.

Ultrasonic fatigue testing machine is used to carry out the fatigue characteristics, fatigue life, prefabricated crack and crack extension test of metal and alloy materials and their components under tensile, compression, or tensile-compression alternating load at room temperature.

超声波疲劳试验机

Equipment Principle

Ultrasonic fatigue test is an accelerated resonance fatigue test method, which establishes a mechanical resonance wave on the loaded sample. Based on the principle of piezoelectric stretching and using high-energy ultrasonic resonance technology, its testing frequency (20kHz) far exceeds the frequency of conventional fatigue testing. In the actual test time, the fatigue degree and data near the threshold can be obtained. Due to the high frequency, the fatigue limit of various industrial materials with high repetition cycles can be quickly detected.

In response to the ultra-long life and ultra-high reliability requirements of modern mechanical equipment parts, the ultrasonic fatigue testing machine is based on the principle of ultrasonic resonance, which generates high-frequency vibration loads on the sample to complete the (ultra) high-cycle fatigue performance test of the material. The third-generation multifunctional ultrasonic fatigue testing machine developed by our company has the characteristics of wide operating frequency range, large output amplitude, and high control accuracy. Stress ratio three-point bending, vibration bending and other loading forms of ultrasonic fatigue test, while providing auxiliary optimization design software for various specimens such as axial tension and compression, three-point bending, and vibration bending.

Advantages

  • It can be used for random variable amplitude loading, including low-level loading, which is closer to engineering reality.
  • Using computer to set and control the test, it is possible to simply reproduce the fatigue damage caused by small defects.
  • Since the test is carried out in a resonance state, high stress can be generated, and the test of 1000MPa grade steel can be carried out.
  • The output power required by the test equipment is very low (tens of watts to hundreds of watts), which can save a lot of energy and test expenses.
  • At resonance, the stress level at the end of the test piece is very low, which simplifies the clamping of the test piece, only one end is required for clamping, which is very beneficial for brittle materials.
  • Quickly evaluate the fatigue life of metal materials with a repetition frequency of 20KHz, shortening the test time by hundreds or even thousands of times.

Main Application

Mainly used in aerospace, high-speed rail cars and power stations and other fields, to carry out alloy steel, aluminum alloy and titanium alloy and other metal materials, as well as carbon fiber composite materials (ultra) high cycle fatigue performance test. Compared with the conventional fatigue test method, the test time can be shortened by more than 90%, and the test cost can be greatly saved.

Control System

The control system is the main software part of the ultrasonic fatigue test system, including four parts: high-precision electromechanical coupling excitation control, fatigue test process monitoring, sample aided design, test remote monitoring and so on. The system has the function of intermittent loading, and can set the continuous and intermittent loading test and intermittent time according to the program; Intermittent loading shall have the function of preventing damage to the sample caused by excessive starting power; The loading can be controlled, and the user can input the load according to the test scheme; The working frequency range can be set. When it exceeds the range, the equipment stops working and a prompt message is displayed on the interface; It has the function of specimen aided design, which is used to assist the user to design the specimen according to the test purpose and material parameters before the test; The software can display the working frequency and nominal displacement data of the ultrasonic generator, and realize the variable load output function of ultrasonic vibration.


 

 

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