Experimental Study on Ultra-High Cycle Fatigue Property of Q345 Welded Joint

Abstract:

The present paper deals with experimental studies on the ultra-high cycle fatigue property of Q345 bridge steel. Using the ultrasonic fatigue testing technique, specimens of Q345 welded joint with hourglass shape were designed using an analytical method combining with the finite element method and then fatigue tested in air at room temperature under fully reversed cyclic loading conditions (R=-1). The results show that the S-N curves of welded joints and relative base material specimens show continuously decreasing tendency in the very high cycle regime (105-109 cycles). Fatigue property of welded joint is much lower than that of base material and the fatigue strength of welded joint is only 45.0% of base material. Fracture can still occur on welded joints beyond 5 106 cycles, which indicates the fatigue limit defined at lifetime of 5 106 cycles cannot guarantee a safe design.

• Periodical: Advanced Materials Research (Volumes 538-541)
• Pages: 1488-1491
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.538-541.1488
• Online since: June 2012
• Authors: Xiao Zhao, Jian Jun Zhao
• Keywords: Q345 Welded Joint, S-N Curve, Ultra-High Cycle Fatigue

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