Study on Fatigue Crack Growth Characteristics of Welded Rail Based on DIC Technology
- Vol. 53, Issue 1, Pages: 44-48(2023)
DOI: 10.7512/j.issn.1001-2303.2023.01.07
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张欣超,彭飞,张洪辉.基于DIC的焊接钢轨疲劳裂纹扩展特性研究[J].电焊机,2023,53(1):44-48.
ZHANG Xinchao, PENG Fei, ZHANG Honghui.Study on Fatigue Crack Growth Characteristics of Welded Rail Based on DIC Technology[J].Electric Welding Machine, 2023, 53(1): 44-48.
位于焊接钢轨轮轨接触表面以下5~25 mm的次表面区域抗蠕滑载荷疲劳裂纹扩展能力的精确表征是合理制定钢轨打磨周期的基础。测试了焊接钢轨次表面母材及焊缝区域在不同应力比下的疲劳裂纹扩展速率,同时借助数字图像相关(DIC)技术捕获了不同条件下试样平面内实时应变特性,解析了母材及焊缝区域抗疲劳裂纹扩展能力及裂纹扩展过程中裂纹面及尖端变形特性。结果表明,相同条件下焊缝区域抗疲劳裂纹扩展能力更弱。低应力比条件下,裂纹扩展表现出更为显著的塑性诱导裂纹屏蔽效应。基于DIC测试获取试样面内变形特征,建立了疲劳裂纹扩展过程中裂纹面及尖端因塑性变形引起的局部应力受力模型。
The exact characterization of rail fatigue cracks growth ability under the creep load is the basis for formulating reasonable rail grinding plan, these cracks located in 5~25 mm below the rail tread. In this paper, fatigue crack growth rate of base metal and joints under different stress ratio were tested, real-time strain characteristics were captured by using DIC (Digital Image Correlation) technology, fatigue crack growth abilities between base metal and joints and characteristics of crack flanks and tips were analyzed. The results show that the fatigue crack growth ability of joint is weaker than that of base metal, obvious characteristics of plasticity-induced crack closure are shown under condition of small stress ratio. Then, a local stress model around crack flanks and tips led by a plastic zone is established based on the results of strain characteristics in the samples got by DIC technology.
焊接钢轨疲劳裂纹扩展次表面数字图像相关技术扩展速率
welded railfatigue crack growthsub surfaceDIC technologygrowth rate
JUN H K,SEO J W,JEON I S. Fracture and fatigue crack growth analyses on a weld-repaired railway rail[J]. Engineering Failure Analysis,2016,59:478-492.
SHI H C,SHI L B,DING H H,et al. Influence of laser strengthening techniques on anti-wear and antifatigue properties of rail welding joint[J]. Engineering Failure Analysis,2019,101:72-85.
IRWIN G R. Analysis of stresses and strains near the end of a crack traversing a plate[J]. Journal of Applied Mechanics,1957,24(361-364):16.
ELBER W. Fatigue crack closure under cyclic tension[J]. Engineering Fracture Mechanics,1970,2(1):37-45.
RITCHIE R O.Influence of microstructure on near-threshold fatigue-crack propagation in ultra-high stren-gth steel[J]. Metal Science,1977,11(8-9):368-381.
TAYLOR D. Fatigue thresholds:their applicability to engineering situations[J]. International Journal of Fatigue,1988,10(2):67-79.
TAYLOR D. Fatigue thresholds[M]. Butterworths,Lo-ndon,1989.
孙强,李雪东,姚腾飞,等. 基于DIC的爆炸加载下脆性材料裂纹扩展规律的试验研究[J]. 爆炸与冲击, 2019,39(10):31-41.
SUN Q,LI X D,YAO T F,et al.Experimental study on crack propagation of brittle materials based on DIC under explosive loading[J]. Explosion and Shock Waves,2019,39(10):31-41.
SU H,LI J,LAI Q,et al.Ratcheting behaviour of flash butt welds in heat-treated hypereutectoid steel rails under uniaxial and biaxial cyclic loadings[J].International Journal of Mechanical Sciences,2020,176:105539.
黄啸,黄颐,刘建中.先进铝锂合金层板疲劳裂纹扩展分层行为[J]. 航空材料学报,2018,38(4):130-136.
HUANG X,HUANG Y,LIU J Z.Delamination Behavior of an Advanced Al-Li Alloy Laminate during Fatigue Crack Growth[J]. Journal of Aeronautical Materials,2018,38(4):130-136.
MCEVILY A J,RITCHIE R O.Crack closure and the fatigue-crack propagation threshold as a function of load ratio[J]. Fatigue & Fracture of Engineering Materials & Structures,1998,21(7):847-855.
FANG X Y,ZHAO Y X,LIU H W.Study on fatigue failure mechanism at various temperatures of a high-speed railway wheel steel[J].Materials Science and Engineering A,2017,696:299-314.
FANG X Y,CAI Z B,WANG J G,et al. Evaluation of temperature-sensitive fatigue crack propagation of a high-speed railway wheel rim material[J]. Fatigue & Fracture of Engineering Materials & Structures,2019,42(8):1815-1825.
方修洋,黄伟,王俊国. 温度对动车组车轮钢服役次生疲劳裂纹起裂扩展特性影响[J]. 中国机械工程,2020,31(3):261-266.
FANG X Y,HUANG W,WANG J G.Effects of Temperature on Secondary Fatigue Crack Initiation and Gr-owth Behavior of High-speed Railway Wheel Steels[J].China Mechanical Engineering,2020,31(3):261-266.
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