Volume 31 Issue 6
Jun.  2016
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Article Navigation >  Journal of Aerospace Power  > 2016  >  31(6): 1359-1367
WANG Rong-qiao, JIANG Kang-he, HU Dian-yin, JING Fu-lei, SHEN Xiu-li. High temperature fatigue life model for single crystal nickel superalloy based on principal component analysis[J]. Journal of Aerospace Power, 2016, 31(6): 1359-1367. doi: 10.13224/j.cnki.jasp.2016.06.011
Citation: WANG Rong-qiao, JIANG Kang-he, HU Dian-yin, JING Fu-lei, SHEN Xiu-li. High temperature fatigue life model for single crystal nickel superalloy based on principal component analysis[J]. Journal of Aerospace Power, 2016, 31(6): 1359-1367. doi: 10.13224/j.cnki.jasp.2016.06.011
shu

High temperature fatigue life model for single crystal nickel superalloy based on principal component analysis

doi: 10.13224/j.cnki.jasp.2016.06.011

  • 1. School of Energy and Power Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China;

  • 2. Academy of Aeronautic Propulsion Technology, Aviation Industry Corporation of China, Beijing 101304, China;

  • 3. Beijing Key Laboratory of Aero-Engine Structure and Strength, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

  • Received Date: 2014-09-20
  • Publish Date: 2016-06-28
    Abstract
  • Fatigue damage in single crystal nickel superalloys is closely related to crystallographic slip along definite crystallographic planes. Thus, it is physically motivated to consider these crystallographic planes as critical planes. The mesoscopic parameters on the critical plane are all connected to the viscoplastic constitutive model, leading to inevitable multicollinearity among them. To address this issue, principal component analysis was performed to eliminate the effect of multicollinearity and determine dominant damage factors. Furthermore, a life model was formulated based on the determined orthogonal dominant damage factors. Compared with the life model which is directly formulated by the original mesoscopic parameters, result shows that this model is much simpler with reliable and stable material constants. The life model is then validated with isothermal fatigue testing results of DD6 at 760℃ and 980℃. Most of the predicted lives are within the triple factor of the measured lives.

     

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