Ultrasonic Fatigue Performance of Welded Joints in 16Mn Steel

Liang Chen Wu; Dong Po Wang

doi:10.4028/www.scientific.net/AMM.251.392

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Ultrasonic Fatigue Performance of Welded Joints in 16Mn Steel
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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vol. 251Ultrasonic Fatigue Performance of Welded Joints in...

Ultrasonic Fatigue Performance of Welded Joints in 16Mn Steel

Abstract:

Ultrasonic fatigue performance test of 16Mn steel and welded joints are carried out by using ultrasonic fatigue test system devices developed by Tianjin University to research its fatigue behavior in the super long life regime. The results show that: regardless of the base mental or welded joints, the S-N curve is a continuous decline curve; Welded joints does not exist the traditional concept of fatigue limit within the range of 10⁶~10⁷, when the number of load cycles exceeds 10⁷ even 10⁹, fatigue fracture still occurs. Within the super long life range, the fatigue strength of welded joint is much lower than the fatigue strength of base mental. It is dangerous to use the existing fatigue data to design the welded structure within the super long life regime.