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RISS 인기검색어
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- 저자 : Hyo-Ri Kim(김효리) (검색결과 2 건)
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Ultrasonic Fatigue Test Method for Stress Ratio Control
Hyo-Ri Kim(김효리),Seung-Hyeon Song(송승현),Ji-U Ha(하지우),Jeong-Eun Lee(이정은),In-Sik Cho(조인식) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
Ultrasonic Fatigue Testing (UFT) is an accelerated fatigue test, typically at 20 kHz, which significantly shortens the application period of newly developed processes and materials in various mechanical parts and materials fields. In this paper, the system technology for controlling the stress ratio in ultrasonic fatigue testing is to be explained. This fatigue stress ratio control test is important for fatigue testing of aviation and power plant turbine parts, and is also an important method for crack propagation testing. Basically, an ultrasonic fatigue tester designed by applying the resonance analysis results to a 20KN tensile tester was attached to set the average stress and then enabled it at various stress ratios. Also, as a method of setting the corrected fatigue stress, the method of measuring the strain gauge at the center of the specimen and the method of simultaneously measuring the amplitude of the end of the specimen are described. Therefore, the results of this paper are intended to explain the construction of an ultrasonic fatigue tester optimized to suit various fatigue conditions and environments.
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Jeong-Eun Lee(이정은),Seung-Hyeon Song(송승현),Ji-U Ha(하지우),Hyo-Ri Kim(김효리),Chang-Soon Lee(이창순),In-Sik Cho(조인식) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
The elastic modulus and Poissons ratio have been measured by the tensile test with the attachment of gauge sensors. However, the simpler dynamic method has been developed by using the acoustic resonance frequency, which is much easier and more accurate than the conventional tensile test. The typical dynamic methods are (i) the Ultrasonic pulse echo method, (ii) the Resonance frequency method, and (iii) the Impulse Excitation Method. Although both the Ultrasonic echo method and the resonance frequency method have widely been used, the Impulse Excitation Method has come into the spotlight due to its simplicity and accuracy, which has also been prescribed in ASTM E1876. In this study, the practical control system has been implemented with the numerical analysis algorithm for the Impulse Excitation Method. With this technique, the dynamic elastic modulus and Poissons ratio have been measured and evaluated for structural materials such as Al7075-T6, STS304, STS420_J2, SCM440, STS630 and Ti6Al4V. Therefore, the reliability was verified through comparative evaluation of the results of the static test method and the dynamic test method for six structural materials.
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