TC11焊接接头髙周疲劳分形损伤模型

刘小刚; 郭海丁; 汪邦中; 李晋伟; 吴冰

TC11焊接接头髙周疲劳分形损伤模型

1.
南京航空航天大学能源与动力学院,南京 210016
2.
北京航空制造工程研究所高能束流加工技术重点实验室,北京 100024

基金项目: 南京航空航天大学青年科技创新基金(NS2010041)

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- 被引次数: 0
出版历程
- 收稿日期: 2009-12-28
- 修回日期: 2010-08-13
- 刊出日期: 2011-02-28

Study on high cycle fatigue fractal damage model of TC11 alloy welded joint

1.
College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China
2.
Key Laboratory of High Energy Density Beam Processing Technology, Beijing Aeronautical Manufacturing Technology Research Institute,Beijing 100024,China

摘要

摘要: 根据金属疲劳断口具有几何分形特征,将Chaboche高周疲劳损伤模型推广到分数维空间,建立了综合考虑断口细观特征的髙周疲劳分形损伤演化模型.针对TC11钛合金电子束焊接接头,以载荷控制的疲劳试验为基础研究其高周疲劳性能;采用扫描电镜法(SEM)对断口微观特征进行定量分析,计算得到了各级载荷下疲劳断口的分形维数;通过对试验数据拟合,得到了疲劳损伤演化模型中的相关材料参数,从而建立了TC11焊接接头各级载荷下的分形损伤演化方程.
- 焊接接头 /
- 高周疲劳 /
- 分形 /
- 分形损伤 /
- 损伤演化
Abstract: Based on the fractal characteristic of the metal fatigue fracture surface, Chaboches high-cycle fatigue (HCF) damage model was extended to fractional dimension space.An HCF fractal damage evolution model considering internal micro damage mechanism was built up in the present paper.By the stress-controlled test,HCF properties of TC11 alloy welded joint were measured;and fractal dimension of the fracture surface was calculated through its scan electron microscope (SEM) picture.The key parameters of damage evolution model mentioned above were obtained through experimental data fitting,and fractal damage evolution equation of TC11 alloy welded joint under each loading level was found thereof.
- welded joint /
- high cycle fatigue /
- fractal /
- fractal damage /
- damage evolution

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参考文献(12)

[1]	Cheng G X,Zuo J Z.Continue damage model of low cycle fatigue and fatigue damage analysis of welded joint [J].Engineering Fracture Mechanics,1996,55(1):155-161.
[2]	倪金刚,陶春虎.损伤力学教程[M].北京:科学出版社,1996. NI Jingang,TAO Chunhu.The course of damage mechanics [M].Beijing:Science Press,1996.(in Chinese)
[3]	郭海丁,邬华芝,刘观日,等.TC4钛合金焊接接头疲劳损伤演变模型研究[J].航空动力学报,2003,18(2):206-210. GUO Haiding,WU Huazhi,LIU Guanri,et al.A research of fatigue damage evolution of TC4 alloy welded joint [J].Journal of Aerospace Power,2003,18(2):206-210.(in Chinese)
[4]	Pande C S,Richards L R,Smith S.Fractal characteristics of fractured surfaces [J].Journal of Mat.Sci.Letters,1987,6(1):295-301.
[5]	Ganti S,Bhushan B.Generalized fractal analysis and its applications to engineering surfaces [J].Wear,1995,180(1):17-34.
[6]	Lu C,Mai Y W,Bai Y.Fractals and scaling in fracture induced by microcrack coalescence [J].Philosophical Magazine Letters,2005,85(2):67-75.
[7]	谢和平,鞠杨.分数维空间中的损伤力学研究初探[J].应用力学学报,1999,31(3):300-309. XIE Heping,JU Yang.A study of damage mechanics theory in fractional dimensional space [J].Acta Mechanica Sinica,1999,31(3):300-309.(in Chinese)
[8]	许开旺.TC11钛合金焊接接头低周疲劳宏细观损伤模型研究 .南京:南京航空航天大学,2004. XU Kaiwang.The research of low cycle fatigue macroscopic damage and microscopic damage evolution of TC11 alloy welded joint .Nanjing:Nanjing University of Aeronautics and Astronautics,2004.(in Chinese)
[9]	武奇,邱惠清,郭海丁.TC11钛合金焊接接头低周疲劳分形损伤演化研究[J].航空动力学报,2008,23(4):730-736. WU Qi,QIU Huiqing,GUO Haiding.Studying for low-cycle fatigue fractal damage evolution on TC11 Ti alloy welded joint[J].Journal of Aerospace Power,2008,23(4):730-736.(in Chinese)
[10]	张国栋,于慧臣,何玉怀,等.损伤力学方法在材料低周疲劳试验中的应用研究[J].航空动力学报,2007,22(9):1544-1549. ZHANG Guodong,YU Huicheng,HE Yuhuai,et al.Application research of damage dynamics for low cycle fatigue test [J].Journal of Aerospace Power,2007,22(9):1544-1549.(in Chinese)
[11]	沈为.损伤力学[M].武汉:华中理工大学出版社,1995. SHEN Wei.Damage mechanics [M].Wuhan:The Huazhong University of Science and Technology Press,1995.(in Chinese)
[12]	李兆霞.损伤力学及其应用[M].北京:科学出版社,2007. LI Zhaoxia.Damage mechanics and its application [M].Beijing:Science Press,2007.(in Chinese)