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SA516 충격시험편의 용접열영향부 노치위치 수치해석 연구
장윤찬(Yunchan Jang),홍재근(Jaekeun Hong),박지홍(Jihong Park),김동욱(Dongwook Kim),이영석(Youngseog Lee) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
Experimental and numerical studies were performed to examine the effects of notch position on the failure behavior and energy absorption when the Charpy V-notch impact test is made at 1℃. For this purpose, carbon steel plate (SA-516 Gr. 70) with thickness of 25mm usually used for pressure vessel was welded by SMAW (Shielded Metal-Arc Welding) method and specimens were fabricated from the welded plate. The Charpy impact tests were then performed with specimens having different notch positions varying within HAZ. A series of three-dimensional FE analysis which simulates the Charpy test and crack propagation are carried out as well to examine the reproducibility of test results. The FE analysis takes into account the heterogeneous mechanical properties with complex microstructures in HAZ. Results reveal that the absorbed energies during impact test depend significantly on the notch position.
장윤찬(Yunchan Jang),홍재근(Jaekeun Hong),박지홍(Jihong Park),김동욱(Dongwook Kim),이영석(Youngseog Lee) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
Numerical studies were performed to examine the effects of notch location of impact specimens on the failure behavior of HAZ (heat affected zone) when Charpy V-notch impact test were made at a low temperature (1℃). Carbon steel plate (SA-516 Gr. 70) with thickness of 25㎜ for pressure vessel was welded by SMAW (shielded metal-arc welding) and specimens were fabricated from the welded plate. Charpy tests were then performed with specimens having different notch positions of specimens varying from the fusion line through HAZ to base metal. A series of finite element analysis which simulates the Charpy test and crack propagation initiating at the tip of V-notch was carried out as well. The finite element analysis takes into account the irregular fusion line and non-homogenous material properties due to the notch location of the specimen in HAZ. Results reveals that the energies absorbed during impact test depend significantly on the notch location and direction of specimen. Finite element analysis also demonstrates that the notch location of specimens, to a great extent, influences the reliability and consistency of the test.
수소배관 운영 조건에 따른 배관강이 수소취성에 미치는 영향 인자 분석
백종현(JONGHYUN BAEK),장윤찬(YUNCHAN JANG),김철만(CHEOLMAN KIM) 한국수소및신에너지학회 2024 한국수소 및 신에너지학회논문집 Vol.35 No.2
Pipeline steels for hydrogen transmission may cause hydrogen embrittlement due to absorption and diffusion of hydrogen through metals. Hydrogen pipes exhibited similar mechanical properties to atmospheric conditions in terms of tensile and yield strength in a hydrogen atmosphere. This paper aims to provide relevant information regarding hydrogen embrittlement in hydrogen transmission pipeline.