Creep life prediction of Ni-based single-crystal superalloy plate with film-cooling holes using a modified critical distance method based on the improved weight function

Ping Wang, Zhixun Wen, Meng Li, Guangxian Lu, Zhenwei Li, Pengfei He

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

This paper proposed a new weight function modified critical distance method to predict the creep life of Ni-based single-crystal superalloy plate with film-cooling holes through experimental and numerical research. The creep test and numerical simulation results both indicated that cracks originated around the hole, and the location of the maximum Mises stress point around the hole was consistent with the crack initiation point shown in the test results. Considering the stress gradient in the thickness direction, a critical fracture surface was defined, and the stress distribution at the critical fracture surface was defined using polynomials. An improved stress gradient function and weight function were introduced to calculate the effective stress at the critical fracture surface. The effective stress was used to predict the creep life of the plate with film-cooling holes. Compared with the experimental results, the errors were all within the dispersion band of 1.5 times, indicating good prediction results.

Original languageEnglish
Pages (from-to)108-123
Number of pages16
JournalFatigue and Fracture of Engineering Materials and Structures
Volume47
Issue number1
DOIs
StatePublished - Jan 2024

Keywords

  • creep life prediction
  • critical distance method
  • film-cooling holes
  • modified weight function
  • Ni-based single-crystal superalloy

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