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Metals 2017, 7(3), 103; doi:10.3390/met7030103

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
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Author to whom correspondence should be addressed.
Academic Editor: Filippo Berto
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)
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Abstract

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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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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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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