TC17钛合金超高周弯曲振动疲劳试验
Experiment on ultra-high cycle bending vibration fatigue of titanium alloy TC17
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摘要: 基于航空发动机叶片基本失效形式,开发了悬臂梁式弯曲振动超声疲劳试验系统(激振频率20kHz),设计了能模拟叶片振动、适合于超高周弯曲振动疲劳试验的试件.利用该系统开展了钛合金TC17超高周弯曲振动疲劳试验研究,分析了断口的金相图.结果发现:裂纹萌生有表面和次表面两种模式,并不依赖于内部夹杂和缺陷,没有发现内部裂纹萌生迹象,次表面裂纹扩展也不呈“鱼眼”形貌.与文献所述的“鱼眼”形貌特征不同.Abstract: The development of an ultra-high cycle bending vibration fatigue system on the basis of the mechanism of the fatigue failure of aeroengine vanes was discussed,including the design of ultra-high cycle dissymmetrical bending fatigue specimens.Research about TC17 was accomplished by the Ultra-High Cycle bending fatigue system (20 kHz).The fractograph of specimens was analyzed.The result indicates that the crack initiation is independent of interior inclusion and defect,and there are two kinds of mechanism of fatigue crack initiation:arising on surface or subsurface void.In addition, behaviors of interior crack initiation and propagation were not found the image of crack propagation is different from “fish-eye”.
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Key words:
- titanium alloys TC17 /
- ultra-high cycle fatigue /
- bending vibration /
- crack initiation /
- crack grow
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[1] Department of Defense.MIL-HDBH-1783B w/change 2 22.Engine structural integrity program(ENSIP)[S]. :Department of Defense,2004. [2] Marines I,Bin X,Bathias C.An understanding of very high cycle fatigue of metals[J].International Journal of Fatigue,2003,25(9-11):1101-1107. [3] Morrissey R,Nicholas T.Staircase testing of a titanium alloy in the gagacycle regime[J].International Journal of Fatigue,2006,28(11):1577-1582. [4] 周承恩,洪友士.GCrl5钢超高周疲劳行为的实验研究[J].机械强度,2004,26(S):157-160. ZHOU Chengen,HONG Youshi.Experimental investigation on very-high-cycle fatigue of GCr15 steel[J].Journal of Mechanical Strength,2004,26(S):157-160.(in Chinese) [5] Xue H Q,Tao H,Montembault F,et al.Development of a three-point bending fatigue testing methodology at 20 kHz frequency[J].International Journal of Fatigue,2007,29(9-11):2085-2093. [6] 唐维维,王宏.超声弯曲疲劳实验方法及其应用[J].力学与实践,2008,30(6):43-46. TANG Weiwei,WANG Hong.Method of ultrasonic bending fatigue and application[J].Mechanics in Engineering,2008,30(6):43-46.(in Chinese) [7] 薛红前.超声振动载荷下材料的超高周疲劳性能研究.西安:西北工业大学,2006. XUE Hongqian.Investigation on fatigue behavior of materials in very high cycle regime under vibratory loading.Xi’an:Northwestern Polytechnical University,2006.(in Chinese) [8] Randall D.Analysis of methods for determining high cycle fatigue strength of a material with investigation of Ti-6Al-4V gigacycle fatigue behavior.USA,DTIC:ADA441887,2005. [9] McEvily A J,Nakamura T,Oguma H,et al.On the mechanism of very high cycle fatigue in Ti-6Al-4V[J].Scripta Materialia,2008(59):1207-1209 [10] 洪友士,赵爱国,钱桂安.合金材料的超高周疲劳行为的基本特征和影响因素[J].金属学报,2009,45(7):769-780. HONG Youshi,ZHAO Aiguo,QIAN Guian.Essential characteristics and influential factors for very-high-cycle fatigue behavior of metallic materials[J].Acta Metallurgical Sinica,2009,45(7):769-780.(in Chinese) [11] Marines-Garcia I,Paris P C,Tada H,et al.Fatigue crack growth from small to large cracks on veryhigh cycle fatigue with fish-eye failures[J].Engineering Fracture Mechanics,2008,75(6):1657-1665. [12] 李永德,杨振国,李守新,等.GCr15轴承钢超高周疲劳性能与夹杂物相关性[J].金属学报,2008,44(8):968-972. LI Yongde,YANG Zhenguo,LI Shouxin,et al.Correlations between very high cycle fatigue properties and inclusions of GCr15 bearing steel[J].Acta Metallurgical Sinica,2008,44(8):968-972.(in Chinese) [13] Bathias C.There is no infinite fatigue life in metallic materials[J].Fatigue Fract Eng. Mater. Struct.,1999,22:559-565. [14] Zuo J H,Wang Z G,Han E H.Effect of microstructure on ultra-high cycle fatigue behavior of Ti-6Al-4V[J].Materials Science and Engineering,2008(A473):147-152. [15] Lanning D B,Nicholas T,Haritos G K.Effect of plastic prestrain on high cycle fatigue of Ti-6Al-4V[J].Mechanics of Materials,2002,34(20:127-134. [16] 赵光菊,钟蜀晖.钛合金疲劳断口形貌及断口分析[J].贵州工业大学学报,2007,36(6):25-28. ZHAO Guangju,ZHONG Shuhui.Study on the fatigue fracture in titanium alloy[J].Journal of Guizhou University of Technology,2007,36(6):25-28.(in Chinese)
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