1. Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China
2. Process Department of Turbine Works, Shanghai Electric Power Generation Equipment Co., Std, Shanghai 200240, China
Analyses of low-cycle fatigue damage to welded joints in turbine rotors are significant to safety assessments. In this paper, fatigue damage mechanics are used to analyze low-cycle fatigue in a 1:1 simulated sample of a NiCrMoV steel low-pressure (LP) steam turbine welded rotor. The elastic modulus method and the stress amplitude method both cannot accurately represent the fatigue damage variable, so this paper presents a combined analysis method, which considers the material damage during cyclic softening (or hardening) in cyclic softening materials or materials with cyclic hardening followed by softening. The results are better than with previous methods for low-cycle fatigue analyses of NiCrMoV steel LP steam turbine welded rotors.
李雅武, 李长宝, 王梅英, 等. 30Cr1Mo1V转子钢低周疲劳性能及损伤演变规律研究[J]. 汽轮机技术, 1998, 40(3): 184-187. LI Yawu, LI Changbao, WANG Meiying, et al.A study on the low cycle fatigue behavior and the evolution law of damage in 30Cr1Mo1V rotor steel[J]. Turbine Technology, 1998, 40(3): 184-187. (in Chinese)
[2]
上海汽轮机厂, 清华大学. 电站设备大型转子焊接制造技术[M]. 北京: 机械工业出版社, 2009. Shanghai Electric Power Generation Equipment Co., Tsinghua University. Welding Technology of Large Welded Rotor of Power Station Equipment [M]. Beijing: China Machine Press, 2009. (in Chinese)
[3]
曹彬, 蔡志鹏, 潘际銮, 等. NiCrMoV钢汽轮机焊接转子模拟件接头低周疲劳性能研究[J]. 热力透平, 2012, 41(4): 256-260. CAO Bin, CAI Zhipeng, PAN Jiluan, et al.Research of low cycle fatigue property on the welded joint' simulating part of NiCrMoV steel rotor[J]. Thermal Turbine, 2012, 41(4): 256-260. (in Chinese)
[4]
张行, 赵军. 金属构件应用疲劳损伤力学[M]. 北京: 国防工业出版社, 1998. ZHANG Xing, ZHAO Jun. Applied Fatigue Damage Mechanics of Metallic Structural Members [M]. Beijing: National Defence Industry Press, 1998. (in Chinese)
[5]
Lemaitre J. 损伤力学教程[M]. 倪金刚, 陶春虎, 译. 北京: 科学出版社, 1996. Lemaitre J. A Course on Damage Mechanics [M]. NI Jingang, TAO Chunhu, trans. Beijing: Science Press, 1996. (in Chinese)
[6]
LI Changchun, QIAN Zhixiong, LI guangxia. The fatigue damage criterion and evolution equation containing material microparameters[J]. Engineering Fracture Mechanics, 1989, 34(2): 435-443.
[7]
叶笃毅, 王德俊, 童小燕, 等. 结构钢表面疲劳损伤演化过程的显微硬度研究方法[J]. 钢铁研究学报, 1998, 10(6): 52-55. YE Duyi, WANG Dejun, TONG Xiaoyan, et al.An approach to investigating evolution of fatigue damage on surface of structural steel based on microhardness[J]. Journal of Iron and Steel Research, 1998, 10(6): 52-55. (in Chinese)
[8]
CHENG Guangxu, LOU Zhiwen, KUANG Zhengbang. A new damage variable for low-cycle fatigue of metallic materials[J]. Engineering Fracture Mechanics, 1994, 48(2): 281-287.
[9]
程光旭, 楼志文, 匡震邦. 一种基于材料延性耗散模型的疲劳损伤研究方法[J]. 力学学报, 1993, 25(4): 496-499. CHENG Guangxu, LOU Zhiwen, KUANG Zhenbang. A research approach based on the exhaustion model of material ductility for fatigue damage[J]. Acta Mechanica Sinica, 1993, 25(4): 496-499. (in Chinese)
[10]
郝谦, 沙鹏, 田富强, 等. 高匹配焊接接头不均匀体低周疲劳损伤研究[J]. 机械强度, 2002, 24(4): 556-557. HAO Qian, SHA Peng, TIAN Fuqiang, et al.Study of low cycle fatigue (LCF) damage on the mechanical heterogeneity model of overmatched welded joints[J]. Journal of Mechanical Strength, 2002, 24(4): 556-557. (in Chinese)
[11]
YANG Xiaohua, LI Nian, JIN Zhihao, et al.Continuous low cycle fatigue damage model and its application in engineering materials[J]. International Journal of Fatigue, 1997, 19(10): 687-692.
[12]
郝谦. 低合金钢焊接接头损伤机理和损伤演变的研究[D]. 北京: 北京工业大学, 2001. HAO Qian. A Study of the Mechanism and Evolution on the Welded Joint's Damage of the Low-Alloy Steel [D]. Beijing: Beijing University of Technology, 2001. (in Chinese)
2014, Vol. 54 
),吴健栋1,汤之南1,张伯奇1,潘际銮1,刘霞1,2
