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INITIATION AND GROWTH BEHAVIOURS OF CONTACT FATIGUE CRACKS |
SHA Jiangbo; JING Hiaotian; LOU Bingzhe; (Department of Materials; Past Box No.719; Xi'an University of Technology; Xi'an 710048) SHEN Fusan (Xi'an University of Technology; Xi'an 710048) |
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Cite this article:
SHA Jiangbo; JING Hiaotian; LOU Bingzhe; (Department of Materials; Past Box No.719; Xi'an University of Technology; Xi'an 710048) SHEN Fusan (Xi'an University of Technology; Xi'an 710048). INITIATION AND GROWTH BEHAVIOURS OF CONTACT FATIGUE CRACKS. Acta Metall Sin, 1995, 31(9): 422-430.
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Abstract The initiation and growth behaviours of contact fatigue cracks under point contact and different f conditions (where f is the coefficient of friction) were studied by stress analysis and SEM observation, and the general and typical characteristics of contact fatigue failure were demonstrated. Results show that under the boundary lubrication condition, the contact fatigue crack initiates at the surface and grows into the subsurface in a manner governed by mode II loading, and the orientation of the crack path is controlled by the maximum shear stress at the advancing crack tip. On condition f=0, the typical crack growing path consists of 4 stages having the shape of the letter U, while it undergoes 3 stages shaped like the letter V on condition f=0. Generally, the contact fatigue failure results from a series of continuous pitting composed of a stochastic combination of the different stages of a typical crack growth process under conditions f≠0.
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Received: 18 September 1995
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1KanetaM.EUROTRIB85,19852MurakamiY.EngFractMech,1983;17:1933Yamashita.Wear,1983;91:2354LOUBingzhe,HANLining,LUZhenxin,SHENFusan.Fatigue90,Honolulu,1990:6275BryantMD.JApplMech.1982,49:3456GuC,LouB,JingX,ShenF.JHeatTreating,1989:7:9877DowsonD,HigginsonG.ElastohydrodynamicLubrication,PergamonPress,19778黄炎.局部应力及其应用.北京:机械工业出版社,1987:177 |
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