Volume 37 Issue 4
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ZHANG Ping, LU Shan, JING Xin, YANG Mao, LUO Zhongbing, ZHOU Rongxin. Simulation method of short crack propagation in turbine disks based on crystal plasticity[J]. Journal of Aerospace Power, 2022, 37(4): 684-693. doi: 10.13224/j.cnki.jasp.20210230
Citation: ZHANG Ping, LU Shan, JING Xin, YANG Mao, LUO Zhongbing, ZHOU Rongxin. Simulation method of short crack propagation in turbine disks based on crystal plasticity[J]. Journal of Aerospace Power, 2022, 37(4): 684-693. doi: 10.13224/j.cnki.jasp.20210230
shu

Simulation method of short crack propagation in turbine disks based on crystal plasticity

doi: 10.13224/j.cnki.jasp.20210230
  • 1.

    School of Power and Energy， Northwestern Polytechnical University，Xi'an 710072，China

  • 2.

    Nondestructive Testing and Evaluation Laboratory， Dalian University of Technology，Dalian Liaoning 116024，China

  • 3.

    College of Civil Engineering， Hefei University of Technology，Hefei 230009，China

  • Received Date: 2021-05-11
  • Publish Date: 2022-04-28
    Abstract
  • In view of the early-stage short crack propagation behaviour in turbine disks under low-cycle fatigue，a method coupling crystal plasticity （CP） theory and extended finite element method （XFEM） was proposed to simulate short cracks in engineering structures.The method used the total cumulative shear strain in crystals as the criterion of crack propagation and made the crack propagate along the slip plane with the most active slip system.By using sub-model technology/regional refinement of grids and a combination of macro-micro constitutive models，the framework overcame the scale mismatch between the real engineering structure and the micro model，and then predicted the short crack propagation path and rate in the dangerous section of a technique turbine disk at an acceptable calculation cost.The results showed that the short crack propagation path and rate in structures was highly affected by crystal orientations，resulting in a large dispersion of fatigue life.At the same time，it verified the feasibility of the CP-XFEM-based framework in predicting the short crack propagation life of engineering structures.

     

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