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Fatigue Crack Growth Life Prediction for Surface Crack Located in Stress Concentration Part Based on 3D-FEM

[+] Author Affiliations
Youichi Yamashita, Masaharu Shinozaki, Yuusuke Ueda, Kenji Sakano

Ishikawajima-Harima Heavy Industries Company, Ltd., Tokyo, Japan

Paper No. GT2002-30304, pp. 705-712; 8 pages
doi:10.1115/GT2002-30304
From:
  • ASME Turbo Expo 2002: Power for Land, Sea, and Air
  • Volume 4: Turbo Expo 2002, Parts A and B
  • Amsterdam, The Netherlands, June 3–6, 2002
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 0-7918-3609-6 | eISBN: 0-7918-3601-0
  • Copyright © 2002 by ASME

abstract

Fatigue crack growth prediction methods using three dimensional finite element analyses were investigated to improve the predictability of part-through surface crack growth life. First, a direct analysis method of cyclic finite element analysis was adopted. Fatigue crack growth was predicted on a step by step basis from the Paris’ law using stress intensity factor range (ΔK) calculated by 3D-FEM. This method takes the procedure of cyclic operation of FE-analysis modeled with crack tip elements, crack growth increment calculation and remeshing of FE-model. Second, a method based on influence function method for ΔK calculation directly using 3D-FE-analysis result has been developed and applied. It was found that crack growth prediction based on step by step finite element method and the method based on the influence function method showed good correlation with the experimental results if Paris’ law coefficient C determined by CT specimen was appropriately used for semi-elliptical surface crack.

Copyright © 2002 by ASME

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