Proceedings of the Korea Committee for Ocean Resources and Engineering Conference (한국해양공학회:학술대회논문집)

Korean Society of Ocean Engineers (한국해양공학회)
권호 표지

The Development Methods of Fatigue Strength Improvement for the Marine Structural Steel

해양구조용강의 피로강도향상 공법개발

  • Park, Keyoung-Dong (School of Mechanical Engineering, Pukyong National University) ;
  • Jung, Jae-Wook (Graduate School of Mechanical Engineering, Pukyong National University)
  • 박경동 (부경대학교 기계공학부) ;
  • 정재욱 (부경대학교 대학원 기계공학부)
  • Published : 2003.10.24
Download PDF
⟨ Previous Next ⟩

Abstract

This study made an experiment On fatigue crack propagation da/dn, stress intensity factor range ${\Delta}K$ respectively in room temperature and in low temperature. And we got the following characteristics from fatigue crack growth test carried Out in the environment of room temperature and law temperature at $25^{\circ}C$, $-60^{\circ}C$, $-80^{\circ}C$, and $-100^{\circ}C$ in the range of stress ratio of 0.3 by means of opening made displacement. The threshold stress intensity factor range ${\Delta}Kth$ in the early stage of fatigue crack growth (Mode I) and stress intensity factor range ${\Delta}K$ in the stable of fatigue crack growth (Made II) was decreased in proportion to descend temperature. It assumed that the fatigue resistance characteristics and fracture strength at law temperature and high temperature is considerable higher than that of room temperature in the early stage and stable of fatigue crack growth region.

Keywords