Abstract
Due to traffic and wave actions, cast steel joints are subjected to variable-amplitude fatigue loading, which may cause fatigue problems. The ratio of the minimum strain to the maximum strain(strain ratio)can be employed to analyze the influence of variable-amplitude fatigue both in the elastic and plastic ranges. To evaluate the effect of the strain ratio on G20Mn5QT cast steel, the fatigue tests of smooth specimens were carried out at the strain ratio of 0.1. The cyclic deformation and the relationships between the strain amplitude, the stress amplitude, the Smith, Watson and Topper(SWT)parameter and fatigue life were studied and compared with those at the strain ratio of -1. Compared with other methods, Basquin formula and Solonberg formula provide reliable and appropriate ranges of S-N curve and fatigue limit at different strain ratios respectively. The SWT parameter can be used to predict the fatigue life at other strain ratios accurately.
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References
Schober H. Cast steel joints for tubular structures[C]. In: The 10th International Symposium on Tubular Structures. Madrid, Spain, 2003: 143–152.
Jin H, Li J, Mo J et al. Fatigue of girth butt weld for cast steel node connection in tower structure under wave loadings[J]. Structural Design of Tall and Special Buildings, 2014, 23(15): 1119–1140.
Chen H, Zhang Q, Jin H. Experimental study on fatigue properties of cast-steel joints of Hangzhou Bay Sightseeing Tower[J]. Journal of Building Structures, 2009, 30(5): 149–154(in Chinese).
Det Norske Veritas. Recommended Practice DNV-RPC203 Fatigue Design of Offshore Steel Structures[S]. 2011.
International Institute of Welding(IIW). IIW Document XIII-1965-03/ XV-1127-03 Recommendations for Fatigue Design of Welded Joints and Components[S]. Paris, France, 2003.
Yu Q, Zhang J, Jiang Y et al. Effect of strain ratio on cyclic deformation and fatigue of extruded AZ61A magnesium alloy[J]. International Journal of Fatigue, 2012, 44: 225–233.
Begum S, Chen D L, Xu S et al. Effect of strain ratio and strain rate on low cycle fatigue behavior of AZ31 wrought magnesium alloy[J]. Materials Science and Engineering A, 2009, 517(1/2): 334–343.
Tongji University. CECS 235: 2008 Technical Specification for Application of Connections of Structural Steel Casting[S]. China Planning Press, Beijing, 2008(in Chinese).
Han Q, Guo Q, Yin Y et al. Fatigue behaviour of G20Mn5QT cast steel and butt welds with Q345B steel[J]. International Journal of Steel Structures, 2016, 16(1): 139–149.
European Committee for Standardization(CEN). DIN EN 10293 Steel Castings for General Engineering Uses[S]. Berlin, Germany, 2005.
Chen H, Grondin G Y, Driver R G. Characterization of fatigue properties of ASTM A709 high performance steel[J]. Journal of Constructional Steel Research, 2007, 63(6): 838–848.
Zheng X, Wang H, Yan J et al. {iyFatigue Theory of Materials and Engineering Applications}[M]. Science Press, Beijing, China, 2013(in Chinese).
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Supported by the National Natural Science Foundation of China (No. 51178307 and No. 51525803).
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Han, Q., Guo, Q., Yin, Y. et al. Effects of strain ratio on fatigue behavior of G20Mn5QT cast steel. Trans. Tianjin Univ. 22, 302–307 (2016). https://doi.org/10.1007/s12209-016-2682-2
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DOI: https://doi.org/10.1007/s12209-016-2682-2