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Characteristics of dwell fatigue failure and methodology for assessing dwell sensitivity in titanium alloys
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Institute of Metal Research,Chinese Academy of Sciences,Institute of Metal Research,Chinese Academy of Sciences,Institute of Metal Research,Chinese Academy of Sciences,Institute of Metal Research,Chinese Academy of Sciences,Institute of Metal Research,Chinese Academy of Sciences,,Rolls-Royce plc,Derby DE BJ,UK,Institute of Metal Research,Chinese Academy of Sciences

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    Abstract:

    Titanium alloys have a dwell fatigue failure mode during service in the aircraft engine, which is manifested by a significant reduction in fatigue life when comparing with normal continuous cycling. In contrast to normal fatigue, dwell fatigue has distinct failure characteristics. Through a systematic experimental research, this paper summarized the characteristics of dwell fatigue failure from three aspects, including the fatigue fracture, secondary crack and strain accumulation. The research objects covered from highly susceptible to unsusceptible titanium alloys. According to the summarized failure characteristics, a methodology for identifying the dwell fatigue failure and assessing the dwell sensitivity has been given, which could provide guidance for the experimental research and engineering failure investigation.

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[Jianke Qiu, Guoqiang Xi, Yingjie Ma, Haibin Ji, Jiafeng Lei, Aijun Huang, David Rugg, Rui Yang. Characteristics of dwell fatigue failure and methodology for assessing dwell sensitivity in titanium alloys[J]. Rare Metal Materials and Engineering,2017,46(S1):124~128.]
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History
  • Received:May 12,2016
  • Revised:May 12,2016
  • Adopted:August 08,2017
  • Online: December 13,2017

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