Please wait a minute...
 首页  期刊介绍 期刊订阅 联系我们 横山亮次奖 百年刊庆
 
最新录用  |  预出版  |  当期目录  |  过刊浏览  |  阅读排行  |  下载排行  |  引用排行  |  横山亮次奖  |  百年刊庆
清华大学学报(自然科学版)  2014, Vol. 54 Issue (2): 178-184    
  论文 本期目录 | 过刊浏览 | 高级检索 |
汽轮机焊接转子接头低周疲劳过程损伤变量的复合分析法
蔡志鹏1(),吴健栋1,汤之南1,张伯奇1,潘际銮1,刘霞1,2
2. 上海汽轮机厂 技术发展处, 上海 200240
Combined analysis method for low-cycle fatigue damage variables in the welded joint of steam turbine rotors
Zhipeng CAI1(),Jiandong WU1,Zhinan TANG1,Boqi ZHANG1,Jiluan PAN1,Xia LIU1,2
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
全文: PDF(1463 KB)   HTML
输出: BibTeX | EndNote (RIS)       背景资料
文章导读  
摘要 

分析焊接转子接头的低周疲劳损伤过程对转子的安全性评估具有重要的指导意义。该文采用疲劳损伤力学的方法分析NiCrMoV钢汽轮机低压焊接转子1∶1模拟件接头低周疲劳过程。针对损伤变量表征方法中的弹性模量法和应力幅值法应用的局限性,并考虑循环前期循环软化(硬化)造成的材料损伤,提出了适用于循环软化材料或者循环前期出现短暂循环硬化、随后循环软化的材料的低周疲劳全过程损伤变量的分析方法——复合分析法。试验结果表明: 在NiCrMoV钢汽轮机低压焊接转子接头的低周疲劳损伤过程分析中,采用复合分析法较弹性模量法和应力幅值法更为合理。

服务
把本文推荐给朋友
加入引用管理器
E-mail Alert
RSS
作者相关文章
蔡志鹏
吴健栋
汤之南
张伯奇
潘际銮
刘霞
关键词 NiCrMoV钢焊接转子低周疲劳损伤变量    
Abstract

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.

Key wordsNiCrMoV steel    welded rotor    low-cycle fatigue    damage variable
收稿日期: 2013-10-09      出版日期: 2015-04-16
ZTFLH:     
基金资助:甘肃省有色金属新材料重点实验室开放基金项目 (SKL12001)
引用本文:   
蔡志鹏, 吴健栋, 汤之南, 张伯奇, 潘际銮, 刘霞. 汽轮机焊接转子接头低周疲劳过程损伤变量的复合分析法[J]. 清华大学学报(自然科学版), 2014, 54(2): 178-184.
Zhipeng CAI, Jiandong WU, Zhinan TANG, Boqi ZHANG, Jiluan PAN, Xia LIU. Combined analysis method for low-cycle fatigue damage variables in the welded joint of steam turbine rotors. Journal of Tsinghua University(Science and Technology), 2014, 54(2): 178-184.
链接本文:  
http://jst.tsinghuajournals.com/CN/  或          http://jst.tsinghuajournals.com/CN/Y2014/V54/I2/178
P C Si Mn Mo Cr Ni V
0.22~0.28 0.15~0.35 0.70~0.90 0.75~0.95 1.70~2.00 1.00~2.00 0.07~0.09 ≤0.015
S Al Cu Sb Sn As Fe
≤0.015 ≤0.010 ≤0.20 ≤0.001 7 ≤0.017 ≤0.025 余量
  25Cr2Ni2MoV转子钢各化学成分的质量分数%
焊接电流I/A 焊接电压U/V 焊接速度v/(mm·s-1) 预热温度T/℃ 层间温度T/℃ 焊丝直径D/mm
450~550 28~32 6~8 200 200~350 3.2
  焊接工艺参数
  疲劳过程循环应变加载曲线示意图
  焊接转子环形模拟件及低周疲劳取样示意图(单位: mm)
  疲劳循环过程材料弹性模量的变化
  弹性模量法表征的疲劳损伤演化过程
  应力幅值法的两种损伤零点标定方法示意
  循环软化材料循环稳定示意图
  疲劳循环过程应力幅值的变化
  以第一个循环为损伤零点的疲劳损伤过程
  损伤零点为循环稳定后最大应力幅值的疲劳损伤过程
  损伤零点为第一次循环初始循环阶段损伤的比较
  循环后期拉伸和压缩过程的不对称性
  有效承载面积
  复合分析法表征的疲劳损伤演化过程
[1] 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)
[1] 李轶非, 蔡志鹏, 汤之南, 潘际銮, 刘霞, 孙林根. 焊接接头低周疲劳性能薄弱区转移[J]. 清华大学学报(自然科学版), 2015, 55(10): 1056-1060,1066.
Viewed
Full text


Abstract

Cited

  Shared   
  Discussed   
版权所有 © 《清华大学学报(自然科学版)》编辑部
本系统由北京玛格泰克科技发展有限公司设计开发 技术支持:support@magtech.com.cn