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Journal of Mechanical Science and Technology

, Volume 20, Issue 12, pp 2136–2146 | Cite as

Creep-fatigue crack growth behavior of a structure with crack like defects at the welds

  • Hyeong-Yeon Lee
  • Seok-Hoon Kim
  • Jae-Han Lee
  • Byung-Ho Kim
Article

Abstract

A study on a creep-fatigue crack growth behavior has been carried out for a cylindrical structure with weldments by using a structural test and an evaluation according to the assessment procedures. The creep-fatigue crack growth behavior following the creep-fatigue crack initiation has been assessed by using the French A16 procedure and the conservatism for the present structural test has been examined. The structural specimen is a welded cylindrical shell made of 316 L stainless steel (SS) for one half of the cylinder and 304 SS for the other half. In the creep-fatigue test, the hold time under a tensile load which produces the primary nominal stress of 45 MPa was one hour at 600°C and creep-fatigue loads of 600 cycles were applied. The evaluation results for the creep-fatigue crack propagation were compared with those of the observed images from the structural test. The assessment results for the creep-fatigue crack behavior according to the French A16 procedure showed that the A16 is overly conservative for the creep-fatigue crack propagation in the present case with a short hold time of one hour.

Key Words

Creep-Fatigue Crack Growth Weld Stress Intensity Factor 

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Copyright information

© The Korean Society of Mechanical Engineers (KSME) 2006

Authors and Affiliations

  • Hyeong-Yeon Lee
    • 1
  • Seok-Hoon Kim
    • 1
  • Jae-Han Lee
    • 1
  • Byung-Ho Kim
    • 1
  1. 1.Mechanical Engineering DivisionKorea Atomic Energy Research InstituteDaejeonKorea

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