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탄성계수와 프아송비 측정을 위한 Impulse Excitation 방법에 대한 신뢰성평가
이중권(JungGwon Lee),서대석,정대웅(DaeUng Jeong),박인규(InGyu Park),조인식(InSik Cho) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12
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 Al6061, SUS400, and Ti6Al4V.
기계부품소재분야에서 적용된 초음파피로시험법의 새로운 장치시스템과 연구분야
서대석(DaeSeok Seo),이중권(JungGwon Lee),이창순(ChangSoon Lee),박인규(InGyu Park),조인식(InSik Cho) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12
The Ultrasonic fatigue tests(UFTs) are typically the accelerated fatigue testing of 20 ㎑, which have resulted in the substantial reduction of the application period of newly developed processes and materials for various machine parts and materials sectors. In this study, the UFT results have been evaluated for the conventional ferrous and non-ferrous materials including the polymer composits. Particularly, the welded plate specimens for the automobiles have been analyzed in detail. Furthermore, the data for the environmental research fields have also been reviewed and evaluated, such as corrosion and fretting fatigue. Finally, the future research orientation in UFTs has been suggested with the recent research developments in the advanced countries.