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Title |
Damage Index Evaluation Based on Dissipated Energy of SCH 40 3-Inch Carbon Steel Pipe Elbows Under Cyclic Loading
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Authors |
김성완(Sung-Wan Kim) ; 윤다운(Da-Woon Yun) ; 전법규(Bub-Gyu Jeon) ; 김성도(Seong-Do Kim) |
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DOI |
https://doi.org/10.11112/jksmi.2021.25.1.112 |
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Keywords |
탄소강관엘보; 손상지수; 소산에너지; 파괴기준 Carbon steel pipe elbow; Damage index; Dissipated energy; Failure criteria |
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Abstract |
The failure mode of piping systems due to seismic loads is the low-cycle fatigue failure with ratcheting, and it was found that the element in which nonlinear behavior is concentrated and damage occurs is the elbow. In this study, to quantitatively express the failure criteria for a pipe elbow of SCH40 3-inch carbon steel under low-cycle fatigue, the limit state was defined as leakage, and the in-plane cyclic loading test was conducted. For the carbon steel pipe elbow, which is the vulnerable part to seismic load of piping systems, the damage index was represented using the moment?deformation angle relationship, and it was compared and analyzed with the damage index calculated using the force?displacement relationship. An attempt was made to quantitatively express the limit state of the carbon steel pipe elbow involving leakage using the damage index, which was based on the dissipated energy caused by repeated external forces.
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