Volume 36 Issue 2
Feb.  2021
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DING Shuiting, ZHOU Huimin, LIU Junbo, ZHANG Gong, LI Guo. Probabilistic damage tolerance assessment of surface features of aero engine life limited parts[J]. Journal of Aerospace Power, 2021, 36(2): 421-430. doi: 10.13224/j.cnki.jasp.2021.02.021
Citation: DING Shuiting, ZHOU Huimin, LIU Junbo, ZHANG Gong, LI Guo. Probabilistic damage tolerance assessment of surface features of aero engine life limited parts[J]. Journal of Aerospace Power, 2021, 36(2): 421-430. doi: 10.13224/j.cnki.jasp.2021.02.021
shu

Probabilistic damage tolerance assessment of surface features of aero engine life limited parts

doi: 10.13224/j.cnki.jasp.2021.02.021
  • 1.

    National Key Laboratory of Science and Technology on Aero-Engine Aero-thermodynamics,School of Energy and Power Engineering,Beijing University of Aeronautics and Astronautics,Beijing 102206,China

  • 2.

    Structure Certification Division,Airworthiness Certification Center,Civil Aviation Administration of China,Beijing 100102,China

  • Received Date: 2020-06-26
  • Publish Date: 2021-02-28
    Abstract
  • In order to meet the safety requirements of airworthiness regulations (FAR/CCAR33.70) on life limited parts (LLPs), a probabilistic surface damage tolerance method was summarized based on the special material data, linear elastic fracture mechanics analysis and damage risk analysis. The damage tolerance assessment for hole features was analyzed and a new modified method for evaluating the probability of failure (POF) was proposed with higher efficiency. This method was verified referring to the test case provided by AC33.70-2. The assessment result showed that the POF of the disk with hole features was 2.677×10-4 times (20 000 cycles) without any in-service inspection and 1.514×10-4 times (20 000 cycles) with two inspections at 4 000 and 8 000 cycles based on the assumption that 90% of the parts are inspected at 4 000 cycles and an independent 90% of the parts are inspected at 8 000 cycles. Based on the modified method, the conservative POF was 3.406×10-4, demonstrating the preliminary compliance of airworthiness regulations. The surface analysis of damage tolerance assessment provides a support for evaluating the safety of hole features, which is instructive to other surface features.

     

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