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최정훈(Jung-Hun Choi),구재민(Jae-Mean Koo),석창성(Chang-Sung Seok),송원근(Weon-Keyu Song) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
In case of large steel water pipe, it have been observed that its fracture mostly occurs due to the complicated outside fatigue load on the pipe in the underground. It is also well known that its damage and leakage happen mainly in a weld zone. In this study we evaluated the fatigue characteristics based on size effect and residual stress by comparing the test results on the standard specimen collected from real pipe with those on full scale pipe.
확률밀도함수를 이용한 상수도 실 배관의 피로수명 특성 평가
최정훈(Jung-Hun Choi),구재민(Jae-Mean Koo),석창성(Chang-Sung Seok),송원근(Weon-Keyu Song) 대한기계학회 2008 大韓機械學會論文集A Vol.32 No.9
The fatigue characteristics of a material or a structure are generally derived from fatigue tests of standard specimens. However, test results of standard specimens are different from those of real structures or components. Therefore, to calculate more accurate fatigue life, the geometrical effect and surface condition must be considered by comparing test results of standard specimens with those of real structures or components. Thus the object of this paper is to evaluate the fatigue characteristics of a real waterwork pipe. Also, to evaluate fatigue characteristic based on life distribution, the statistical fatigue characteristics were analyzed by the normal distribution and related data of P-S-N curve.
최정훈(Jung-Hun Choi),석창성(Chang-Sung Seok),박재실(Jae-Sil Park),김대진(Dae-Jin Kim),송원근(Weon-Keyu Song),조우현(Woo-Hyun Cho) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.8
The fatigue characteristic of a material or a structure is derived from fatigue tests of standard specimens. However many researches have reported that test results of standard specimens are very different from those of real structures or components. Therefore, to calculate more accurate fatigue life, the constraint effect must be considered by comparing test results of standard specimens with those of real structures or components. Also fatigue life is must affected by a surface condition. Therefore to evaluate the fatigue life of a piping system fatigue tests must be conducted with a specimen extracted from a pipe with the same surface condition. Thus the object of this paper is to evaluate the fatigue characteristic of a real waterworks pipe by conducting fatigue tests with standard specimens and non-standard(plate-shaped) specimens of base metal and weld metal.