Finite element simulation for effect of loading on HCF life scatter
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摘要: 给出了基于晶体塑性理论的高循环疲劳(HFC)寿命分散性有限元模拟方法.针对典型钛合金TC4的微结构特征,采用Voronoi方法建立其晶粒模型,建立钛合金晶体塑性本构方程,计算模拟了应力水平对疲劳寿命分散性的影响,给出表征疲劳寿命分散性的参数.结果表明:应力水平越低,疲劳寿命越长,疲劳寿命的分散性越大,与实验规律一致.Abstract: The finite element simulation method of high cycle fatigue(HCF) life scatter based on crystal plasticity theory was introduced. According to the features of microstructure of typical titanium alloy TC4, the grains model was established by Voronoi method. Combining the crystal plasticity constitutive equations of titanium alloy, the simulation of the effect of stress level on the fatigue life scatter was performed. The parameter of fatigue life dispersion was given. Results show that,the fatigue life is longer and the life is more dispersed as the loading decreases.
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Key words:
- Titanium alloy /
- high cycle fatigue /
- microstructure /
- life scatter /
- crystal plasticity theory
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[1] 李其汉,王延荣,王建军.航空发动机叶片高循环疲劳失效研究[J].航空发动机,2003.29(4):16-18. LI Qihan,WANG Yanrong,WANG Jianjun.Investigation of high cycle fatigue failures for the aero engine blades[J].Aeroengine,2003,29(4):16-18.(in Chinese) [2] Schijve J.Fatigue of structures and materials[M].Dordrecht:Kluwer Academic,2009. [3] Brogdon M L,Rosenberger A H.Evaluation of the influence of grain structure on the fatigue variability of waspaloy[R].Champion,PA:The 11th International Symposium on Superalloys,2008. [4] Cashman G T.A review of competing modes fatigue behavior[J].International Journal of Fatigue,2010,32(3):492-496. [5] Jha S K,Caton M J,Larsen J M.The mean VS life-limiting fatigue response of a Ni-base superalloy:Part Ⅰ mechanisms[R].Air Force Research Lab,AFRL-RX-WP-TM-2010-4084,2008. [6] Cashman G T.A model for competing failures modes in elevated temperature strain cycle fatigue[D].Dayton:University of Dayton,2000. [7] Morrisseya R J,John R,Porter W J.Fatigue variability of a single crystal superalloy at elevated temperature[J].International Journal of Fatigue,2009,31(11):1758-1763. [8] Jha S K,Chandran R K S.An unusual fatigue phenomenon:duality of the S-N fatigue curve in the β-titanium alloy Ti-10V-2Fe-3Al[J].Scripta Materialia,2003,48(8):1207-1212. [9] Jha S K,Larsen J M,Rosenberger A H.Towards a physics-based description of fatigue variability behavior in probabilistic life prediction[J].Engineering Fracture Mechanics,2009,76(5):681-694. [10] Goldena P J,Johna R,Porter III W J.Variability in room temperature fatigue life of alpha + beta processed Ti-6Al-4V[J].International Journal of Fatigue,2009,31(11):1764-1770. [11] Jha S K,Larsen J M,Rosenberger A H.The role of competing mechanisms in the fatigue life variability of a nearly fully-lamellar γ-TiAl based alloy[J].Acta Materialia,2005,53(5):1293-1304. [12] McDowell D L,Dunne F.Microstructure-sensitive computational modeling of fatigue crack formation[J].International Journal of Fatigue,2010,32(9):1521-1542. [13] Przybyla C P.Microstructure-sensitive extreme value probabilities of fatigue in advanced engineering alloys[D].Atlanta:Georgia Institute of Technology,2010. [14] Szczepanski C J,Przybyla C P, Larsen J M.The hierarchy of fatigue mechanisms in the long lifetimeregime[R].Air Force Research Lab,AFRL-RX-WP-TP-2011-4373,2011. [15] Shenoy M M.Constitutive modeling and life prediction in Ni-base superalloys[D].Atlanta:Georgia Institute of Technology,2006. [16] Zhang M.Crystal plasticity modeling of Ti-6Al-4V and its application in cyclic and fretting fatigue analysis[D].Atlanta:Georgia Institute of Technology,2008.
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