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方修洋,黄伟.基于全场法的航空Ti-2Al-1.5Mn钛合金疲劳裂纹扩展各向异性研究[J].稀有金属材料与工程(英文),2020,49(10):3439~3444.[Fang Xiuyang and Huang Wei.Study on anisotropy of fatigue crack propagation of Ti-2Al-1.5Mn titanium alloy based on full-field measurements[J].Rare Metal Materials and Engineering,2020,49(10):3439~3444.]
Study on anisotropy of fatigue crack propagation of Ti-2Al-1.5Mn titanium alloy based on full-field measurements
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Received:November 07, 2019  Revised:December 25, 2019
DOI:
Key words: fatigue crack growth  full-field measurements  CJP model
Foundation item:中国博士后科学基金资助项目(项目编号2019M653474),中央高校基本科研业务费 (项目编号2682017CX033), 四川省青年科技创新团队专项计划 (项目编号2017TD0017)
Author NameAffiliation
Fang Xiuyang and Huang Wei  
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Abstract:
      Characterizations of fatigue crackSpropagationSresistance of the key bearing structures precisely in aviation area are the basis of its service lifetime evaluation. In this work, Ti-2Al-1.5Mn titanium alloy was selected, some CT samples were prepared along different sheet orientation, the fatigue crack growth rate test was carried out, the stress intensity factor range DK at different crack stage were calculated based on full-field measurements and traditional method. It can be concluded that the fatigue crack growth rate da/dN versus DK curve and crack growth path are affected by material orientation. Compared with the traditional method, DK calculation based on full-field measurements was proved to be more efficient. For one thing, the crack shielding effect due to plastic zone in crack tip can be directly considered. For another, a more accurate DK can be got for the case that the crack path was zigzag. It has a wideSapplication in future of DK calculation based on full-field measurements.