Experimental Study on Medium and Low Cycle Fatigue Properties of Cast Steel GS20Mn5V

doi:10.1007/s12204-020-2237-5

Abstract

Abstract: Owing to the remarkable advantages in mechanical behavior, cast steel nodes have been widely usedin static structures. Nowadays, cast steel nodes also gain increasing popularity due to the superior fatigue performancein dynamic structures, but they are not yet widely used because the fatigue properties of cast steel arenot well understood. In this paper, the fatigue test of cast steel GS20Mn5V commonly used in steel castings iscarried out. The strength of medium and low cycle fatigue and the fatigue limit are obtained. The feasibilityof the estimated S-N (fatigue stress versus life) curve is tested. The double logarithmic linear model (DLLM)and the reversed generalized Pareto model (RGPM) are used to fit the experimental data, and the comparisonis made. The P-S-N (the relationship between fatigue stress and life at different survival rates) curve obtainedby the RGPM is proposed. The results show that the estimated S-N curve is not suitable for low cycle fatiguelife, fitting the experimental data with the RGPM is the best, and obtaining the P-S-N curve from the RGPM isfeasible.

Key words: cast steel GS20Mn5V, fatigue test, double logarithmic linear model (DLLM), reversed generalizePareto model (RGPM), S-N curve, P-S-N curve

CLC Number:

JIN Hui∗ (靳慧), MO Jianhua (莫建华), SUN Sijia (孙思嘉), ZHAO Jing (赵静). Experimental Study on Medium and Low Cycle Fatigue Properties of Cast Steel GS20Mn5V[J]. J Shanghai Jiaotong Univ Sci, 2021, 26(6): 765-773.

References 20

[1]	HALDIMANN-STURN S C, NUSSAUMER A. Fatiguedesign of cast steel nodes in tubular bridge structures[J]. International Journal of Fatigue, 2008, 30(3):528-537.
[2]	JIN H, LI J, LI A Q. Checking calculation of fatiguestrength for cast steel joints of offshore tour tower underwave loads [J]. Journal of Southwest Jiaotong University,2010, 45(5): 692-697 (in Chinese).
[3]	JIN H, LI J, MO J H, et al. Fatigue of girth butt weldfor cast steel node connection in tower structure underwave loadings [J]. The Structural Design of Tall andSpecial Buildings, 2014, 23(15): 1119-1140.
[4]	GUO Q, HUANG X, HAN Q H, et al. Effective notchstress analysis of butt weld on cast steel joint [J]. Journalof Civil, Architectural & Environment Engineering,2018, 40(3): 23-30 (in Chinese).
[5]	HAN Q, GUO Q, YIN Y, et al. Fatigue performanceof butt welds between cast steel joint and steel tubularmembers [J]. Fatigue & Fracture of Engineering Materials& Structures, 2017, 40(4): 642-651.
[6]	HAN Q H, GUO Q, YIN Y, et al. Fatigue behavior ofG20Mn5QT cast steel and butt welds with Q345B steel[J]. International Journal of Steel Structures, 2016,16(1): 139-149.
[7]	GUO Q. Experimental research and numerical analysison fatigue behavior of circular butt welds on cast steeljoints [D]. Tianjin, China: Tianjin University, 2015 (inChinese).
[8]	JIN C L. Fatigue analysis of butt welds of cast steeljoints based on notch stress approach [D]. Nanjing,China: Southeast University, 2018 (in Chinese).
[9]	SUN Y, ZHU L M, WANG L X, et al. Fatiguestrength analysis of girth butt weld of cast steel jointwith branches based on equivalent structural stressmethod [J]. Chinese Journal of Applied Mechanics,2019, 36(1): 183-190 (in Chinese).
[10]	GONG W J. Effect of casting defects on mechanicalproperties of steel structure with cast steel nodes [D].Nanjing, China: Southeast University, 2016 (in Chinese).
[11]	LI K S, WU S. Effect of casting defects on the fatigueproperties of steel joints in the construction tubulartruss bridge [J]. Foundry Technology, 2018, 39(6):1188-1191 (in Chinese).
[12]	LI K S, WU S. Fatigue analysis on casting defects ofcast steel joints [J]. Foundry Technology, 2018, 39(10):2190-2192 (in Chinese).
[13]	ZHU M L, XUAN F Z, DU Y N, et al. Very highcycle fatigue behavior of a low strength welded jointat moderate temperature [J]. International Journal ofFatigue, 2012, 40: 74-83.
[14]	ZHU M L, XUAN F Z, CHEN J. Influence of microstructureand microdefects on long-term fatigue behaviorof a Cr-Mo-V steel [J]. Materials Science andEngineering A, 2012, 546: 90-96.
[15]	ZHU M L, XUAN F Z. Failure mechanisms and fatiguestrength assessment of a low strength Cr-Ni-Mo-V steelwelded joint: Coupled frequency and size effects [J].Mechanics of Materials, 2016, 100: 198-208.
[16]	Shenyang Research Institute of Foundry Co., Ltd.Methods for ultrasonic testing and for specifying qualitylevels of steel castings: GB/T 7233—1987 [S].Shenyang, China: National Technical Committee onFoundry of Standardization Administration of China,1987 (in Chinese).
[17]	ZHAO S B, WANG Z B. Anti-fatigue design: Methodsand data [M]. Beijing, China: Machinery IndustryPress, 1997 (in Chinese).
[18]	WHEELER J B, HOERSCH H M, MAHY H P, etal. Statistical analysis of fatigue data [M]. Philadelphia,USA: American Society for Testing and Materials,1981.
[19]	JIN H, ZHANG Q L, WANG H J. Check of fatiguestrength of members for cast steel node [J]. Steel Construction,2008, 23(10): 17-21 (in Chinese).
[20]	CASTILLO E, HADI A S. Modeling lifetime data withapplication to fatigue models [J]. Journal of the AmericanStatistical Association, 1995, 90(431): 1041-1054.