Ti-6Al-4V钛合金的疲劳裂纹扩展规律
Fatigue Crack Propagation Rules of Ti-6Al-4V Titanium Alloy
摘 要
针对熔模铸造Ti-6Al-4V钛合金的等幅疲劳裂纹扩展速率和疲劳裂纹扩展门槛值进行了研究。结果表明:该钛合金CT试样的疲劳裂纹扩展门槛值高于CCT试样的疲劳裂纹扩展门槛值,同一类试样的疲劳裂纹扩展门槛值随着应力比的增加呈下降趋势;疲劳裂纹扩展速率随着平均应力的增加以及应力水平的增加而增大;根据疲劳裂纹扩展试验数据拟合了Ti-6Al-4V钛合金Paris方程和Walker方程中的相关材料参数, 以为材料的使用寿命评估及损伤容限设计提供参考。
疲劳裂纹扩展门槛值
疲劳裂纹扩展速率
应力比
Ti-6Al-4V titanium alloy
fatigue crack propagation threshold value
fatigue crack propagation rate
stress ratio
Abstract
The fatigue crack propagation rate under constant amplitude loading and the fatigue crack propagation threshold value of Ti-6Al-4V titanium alloy were studied by tests．The results indicate that the fatigue crack propagation threshold values of CT specimens were higher than that of CCT specimens for the same material, and the fatigue crack propagation threshold values of the same kind of specimens decreased linearly with the increase of the test stress ratio. The change rules of fatigue crack propagation rate increased with the increase of average stress and stress level were gained．The material parameters of the Paris and Walker equations were derived from the test data for Ti-6Al-4V titanium alloy. The research results could provide reference for assessment of the material life and damage tolerance design.
中图分类号 TB31
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收稿日期 2011/5/23
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备注张亚娟(1972-),女,高级工程师,硕士。
引用该论文: ZHANG Ya-juan,YAO Yi,LIU Hai-yan. Fatigue Crack Propagation Rules of Ti-6Al-4V Titanium Alloy[J]. Physical Testing and Chemical Analysis part A:Physical Testing, 2011, 47(12): 752～755
张亚娟,姚易,刘海燕. Ti-6Al-4V钛合金的疲劳裂纹扩展规律[J]. 理化检验－物理分册, 2011, 47(12): 752～755
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参考文献
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【2】MORRISSEY R J,MCDOWELL D I,NICHOLAS T. Frequency and stress ratio effects in high cycle fatigue of Ti-6Al-4V[J]. International Journal of Fatigue,1999,21(7):679-685.
【3】洪权,杨冠军,赵永庆,等. Ti-6Al-4V钛合金包覆叠轧薄板的轧制工艺对力学性能的影响[J]. 稀有金属快报,2005,26(6):26-29.
【4】赖焕生,李煜佳,轩福穴,等. Ti-6Al-4V钛合金长寿命疲劳试验[J]. 南京工业大学学报(自然科学版), 2009, 31(5):15-19.
【5】李兴无,夏绍玉,沙爱学,等. Ti-6Al-4V合金的疲劳性能[J]. 金属学报,2002,38(21):277-279.
【6】GB/T 6398-2000金属材料疲劳裂纹扩展速率试验方法[S].
【7】PARIS P C, ERDOGAN F. A critical analysis of crack propagation laws[J]. Journal of Basic Engineering,1963,85:528-634.
【8】颜鸣皋. 疲劳裂纹扩展速率手册[M]. 北京: 北京航空材料研究院, 1984.
【9】WALKER K. The effect of stress ratio during crack propagation and fatigue for 2024-T3 and 7075-T6 aluminum[J]. ASTM STP462,1970:1-14.
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