Volume 36 Issue 8
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JING Fulei, TANG Shibai, YANG Junjie. Influence of small hole on thermal mechanical fatigue in single crystal superalloy DD6[J]. Journal of Aerospace Power, 2021, 36(8): 1669-1679. doi: 10.13224/j.cnki.jasp.20200469
Citation: JING Fulei, TANG Shibai, YANG Junjie. Influence of small hole on thermal mechanical fatigue in single crystal superalloy DD6[J]. Journal of Aerospace Power, 2021, 36(8): 1669-1679. doi: 10.13224/j.cnki.jasp.20200469
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Influence of small hole on thermal mechanical fatigue in single crystal superalloy DD6

doi: 10.13224/j.cnki.jasp.20200469

  • 1. Aero Engine Academy of China, Aero Engine Corporation of China, Beijing 101304, China;

  • 2. Institute for Aero Engine, Tsinghua University, Beijing 100084, China

  • Received Date: 2020-11-03
  • Publish Date: 2021-08-28
    Abstract
  • Mechanical strain -controlled thermal mechanical fatigue(TMF) tests under in-phase(IP) and out-of-phase(OP) cycles were performed on specimens with/without small hole made of nickel based single crystal superalloy DD6, and the impacts of stress concentration induced by small hole and phase shift between the mechanical strain and temperature on lifetime on crack initiation were studied. The results indicated that the life of the specimens with small hole whose cracks initiated at the location of maximum principal stress around the hole was one order of magnitude lower than that of smooth ones. Moreover,the OP life was lower than IP for specimens with small hole,which was consistent with that for specimens without small hole. The distribution and evolution of stress and strain in the specimens were obtained with the aid of numerical simulation with viscoplastic constitutive model based on slip systems. The correlation between the damage generated in single crystal superalloy under TMF loadings and the macro-/micro-parameters was identified. Based on the above-mentioned results, a new life model which could consider the effect of stress concentration and phase shift was proposed for the TMF life prediction. The predicted life of DD6 specimens with and without small hole under IP and OP TMF loadings was approximately within a factor 2 of the experimental life.

     

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