Investigation of High Cycle and Low Cycle Fatigue Interaction on Fatigue Behavior of Welded Joints

Abstract:

Samples of Q345 steel welded joints were tested to failure under low cycle fatigue(LCF),high cycle fatigue(HCF) and combined fatigue(CCF) using an apparatus that is capable of providing interactive LCF/HCF loading. The stress ratio R is 0.5 and the frequency of HCF is about 19kHz. The result indicates that not only high frequency minor cycles superimposed on low frequency major cycles , but also low frequency minor cycles superimposed on high frequency major cycles can do remarkable damage to fatigue performance of welded joints. The CCF strength is characterized by amplitude envelope. If CCF fatigue life is characterized by LCF life, adverse effect of HCF component is underestimated. If CCF fatigue life is characterized by HCF life, adverse effect of LCF component is overrated.

• Periodical: Applied Mechanics and Materials (Volumes 217-219)
• Pages: 2101-2106
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.217-219.2101
• Online since: November 2012
• Authors: Liang Chen Wu*, Dong Po Wang
• Keywords: Combined Cycle Fatigue, Fatigue Behavior, High Cycle Fatigue (HCF), Low Cycle Fatigue, Welded Joint

References

[1] Powell B E, Hawkyard M and Grabowski L: International Journal of Fatigue Vol.1(1997), p.167

[2] Dungey C, Bowen P: Journal of Materials Processing Technology Vol. 10 (2004), p.374

[3] Byrne J, Hall R F and Powell B E: International Journal of Fatigue Vol. 9 (2003), p.827

[4] Matikas T E: Fatigue & Fracture of Engineering Materials and Structures Vol. 10 (2001), p.687