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作者:

Chen, Chao -Lin (Chen, Chao -Lin.) | Shang, De-Guang (Shang, De-Guang.) (学者:尚德广) | Xiao, Na-Min (Xiao, Na-Min.) | Li, Xing -Wu (Li, Xing -Wu.) | Sha, Ai-Xue (Sha, Ai-Xue.) | Li, Jing (Li, Jing.) | Li, Jing-Xuan (Li, Jing-Xuan.) | Tang, Zhi-Qiang (Tang, Zhi-Qiang.) | Han, Zhao-Yun (Han, Zhao-Yun.)

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摘要:

Fatigue failure mechanism of Ti60 titanium alloy under tension-torsion multiaxial loading in the very high cycle regime was studied first, and the results showed that the shear/axial stress ratio directly affects the failure mechanism. When the shear/axial stress ratio is relatively small, cracks tend to originate from the subsurface in single-point initiation mode, and the larger the shear/axial stress ratio, the more cracks tend to originate from the surface in multi-point initiation mode. Then, a pragmatic equivalent method for multiaxial to uniaxial load based on the law of shear/axial stress ratio on fatigue strength was proposed. Based on this method and uniaxial S-N curve, the fatigue lives of Ti60 specimens under shear/axial stress ratios of 1.37, 1.95, and 3.53 was predicted, and the experimental results showed that the prediction error is basically within a factor of 3.

关键词:

Titanium alloy Life prediction Very high cycle fatigue Failure mechanism Multiaxial fatigue

作者机构:

  • [ 1 ] [Chen, Chao -Lin]Beijing Univ Technol, Coll Mech & Energy Engn, Beijing 100124, Peoples R China
  • [ 2 ] [Shang, De-Guang]Beijing Univ Technol, Coll Mech & Energy Engn, Beijing 100124, Peoples R China
  • [ 3 ] [Tang, Zhi-Qiang]Beijing Univ Technol, Coll Mech & Energy Engn, Beijing 100124, Peoples R China
  • [ 4 ] [Han, Zhao-Yun]Beijing Univ Technol, Coll Mech & Energy Engn, Beijing 100124, Peoples R China
  • [ 5 ] [Xiao, Na-Min]AECC Beijing Inst Aeronaut Mat, Beijing 100095, Peoples R China
  • [ 6 ] [Li, Xing -Wu]AECC Beijing Inst Aeronaut Mat, Beijing 100095, Peoples R China
  • [ 7 ] [Sha, Ai-Xue]AECC Beijing Inst Aeronaut Mat, Beijing 100095, Peoples R China
  • [ 8 ] [Li, Jing]AECC Beijing Inst Aeronaut Mat, Beijing 100095, Peoples R China
  • [ 9 ] [Li, Jing-Xuan]AECC Beijing Inst Aeronaut Mat, Beijing 100095, Peoples R China

通讯作者信息:

  • [Shang, De-Guang]Beijing Univ Technol, Coll Mech & Energy Engn, Beijing 100124, Peoples R China;;[Xiao, Na-Min]AECC Beijing Inst Aeronaut Mat, Beijing 100095, Peoples R China;;

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来源 :

INTERNATIONAL JOURNAL OF FATIGUE

ISSN: 0142-1123

年份: 2024

卷: 184

6 . 0 0 0

JCR@2022

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