Journal of Mechanical Science and Technology

The Korean Society of Mechanical Engineers (대한기계학회)
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Creep-Fatigue Crack Growth Behavior of a Structure with Crack Like Defects at the Welds

  • Lee, Hyeong-Yeon (Mechanical Engineering Division, Korea Atomic Energy Research Institute) ;
  • Kim, Seok-Hoon (Mechanical Engineering Division, Korea Atomic Energy Research Institute) ;
  • Lee, Jae-Han (Mechanical Engineering Division, Korea Atomic Energy Research Institute) ;
  • Kim, Byung-Ho (Mechanical Engineering Division, Korea Atomic Energy Research Institute)
  • Published : 2006.12.01
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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 $600^{\circ}C$ 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 Al6 procedure showed that the Al6 is overly conservative for the creep-fatigue crack propagation in the present case with a short hold time of one hour.

Keywords

References

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