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Very High Cycle Fatigue of Butt-Welded High-Strength Steel Plate

Department of Mechanical Engineering, Ajou University, 206 Worldcup-ro, Yeongtong-gu, Suwon, 16499, Korea
Author to whom correspondence should be addressed.
Academic Editor: Filippo Berto
Metals 2017, 7(3), 103;
Received: 2 January 2017 / Revised: 2 March 2017 / Accepted: 6 March 2017 / Published: 21 March 2017
(This article belongs to the Special Issue Fatigue Damage)
PDF [5832 KB, uploaded 22 March 2017]


Welded parts fabricated from high-strength steel (HSS) require an almost infinite lifetime, i.e., a gigacycle (109). Therefore, it is necessary to test its high-cycle fatigue behavior. In this paper, an accelerated fatigue test method using ultrasonic resonance is proposed. This method reduces the experimental time required in comparison with a conventional fatigue test setup. The operating principle of the accelerated ultrasonic fatigue test involved the use of a 20-kHz resonant frequency. Therefore, it was necessary to design a specimen specifically for the test setup. In the study, ultrasonic fatigue testing equipment was used to test butt-welded 590- and 780-MPa ferrite–bainite steel plates. In order to design the specimen, a dynamic Young’s modulus was measured using piezoelectric element, a laser Doppler vibrometer, and a digital signal analyzer. The S–N curves of fatigue behavior of the original and butt-welded specimens were compared. The fatigue test results showed that the infinite (i.e., gigacycle) fatigue strengths of the welded specimens were approximately 8% less than those of the original specimen.
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Keywords: ultrasonic fatigue test; high-strength steel; plate specimen; butt welding; dynamic elastic modulus ultrasonic fatigue test; high-strength steel; plate specimen; butt welding; dynamic elastic modulus

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Yeom, H.; Choi, B.; Seol, T.; Lee, M.; Jeon, Y. Very High Cycle Fatigue of Butt-Welded High-Strength Steel Plate
. Metals 2017, 7, 103.

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