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A Study on Fatigue Crack Growth Parameters for Fatigue Life Assessment based on Fracture Mechanics

파괴역학 기반 피로 수명 평가를 위한 피로 균열 진전 파라미터에 관한 연구

  • Kim, Hyeon-Su (Industrial Technology Institute, Hyundai Heavy Industries CO., LTD.) ;
  • Park, Tae-Jong (Industrial Technology Institute, Hyundai Heavy Industries CO., LTD.) ;
  • Lee, Dong-Ju (Industrial Technology Institute, Hyundai Heavy Industries CO., LTD.) ;
  • Shin, Sang-Beom (Industrial Technology Institute, Hyundai Heavy Industries CO., LTD.) ;
  • Kim, Myung-Hyun (Naval Architecture and Ocean Engineering, Pusan National University)
  • 김현수 (현대중공업 생산기술연구소) ;
  • 박태종 (현대중공업 생산기술연구소) ;
  • 이동주 (현대중공업 생산기술연구소) ;
  • 신상범 (현대중공업 생산기술연구소) ;
  • 김명현 (부산대학교 조선해양공학과)
  • Received : 2016.06.18
  • Accepted : 2016.10.24
  • Published : 2017.02.28

Abstract

Recent studies on the fatigue assessment of high strength steel weld based on the fracture mechanics have frequently raised the problems related to the conservatism in the fatigue crack growth rate specified in the relevant design code. The purpose of this study is to evaluate the effect of the fatigue crack growth parameter on the fatigue life for the low carbon steel weld. In order to do it, the fatigue tests with the constant stress ratio were performed to evaluate the fatigue crack growth rate in the butt weld of SM490. And the fatigue crack growth parameters of the weld were evaluated in accordance with ASTM E647. From the comparative fatigue assessment results, it was found that the fatigue crack growth rate specified in the relevant design code was too conservative to estimate the residual fatigue life of welded structure. So, in order to get the more reliable results, it was recommended that the fatigue life estimation based on the fracture mechanics be performed with the fatigue crack growth parameter specified by test.

References

  1. KwangJin Kim, Evaluation of Fatigue Crack Growth Rate on the Surface of Steel Members Using COD (Crack Opening Displacement) Measurement, Journal of Korea Institute for Structure Maintenance and Inspection, 15-2 (2011), 179-288 (in Korean) https://doi.org/10.11112/jksmi.2011.15.2.179
  2. BS7910, Guide to methods for assessing the acceptability of flaws in metallic structures, (2013)
  3. Olaf Doerk, Sang-Beom Shin, Gyu-Beak An, Design Impact of Fracture Mechanics Properties of High Toughness YP47 Welds, Proceedings of the International Ocean and Polar Engineering Conference, (2014)
  4. ASTM E647, Standard Test Method for Measurement of Fatigue Crack Growth Rates, (2015)