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이수식(Soo Sig Lee),남기우(Ki Woo Nam),안석환(Seok Hwan Ahn) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
The experimental and the analysis for effects of circumferentially local wall thinning on the fracture behavior of pipes were investigated. Local wall thinning for experimental was machined on the outside of pipes in order to simulate erosion corrosion metal loss. In addition, the pipes with local wall thinning on the inside were carried out FEM analyses, and it made a comparative study with that of outside. Fracture type could be classified into ovalization, local buckling, and crack initiation depending on the eroded length and eroded ratio. Three-dimensional elastic-plastic analyses were able to accurately simulate fracture behaviors of inside outside local wall thinning. Therefore, the fracture behaviors of the inside local wall thinning can be estimation with the outside local wall thinning.
이수식(Soo-Sig Lee),안석환(Seok-Hwan Ahn),남기우(Ki-Woo Nam) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.8
Fracture behaviors and strength of pipes with local wall thinning are very important for the integrity of energy plants. In pipes of energy plants, sometimes, the local wall thinning may result from severe erosion-corrosion damage. Recently, the effects of local wall thinning on strength and fracture behaviors of piping system have been well studied. In this paper, the monotonic bending tests were performed of full-scale carbon steel pipes with local wall thinning. Also, the elesto-plastic analysis is performed by FE code ANSIS. We compared the simulated results by finite element analysis with experimental ones. The failure mode, fracture strength and fracture behavior obtained from tests showed well agrees with analytic results.
안석환(SEOK-HWAN AHN),이수식(SOO-SIG LEE),김진욱(JIN-WOOK KIM),윤자문(JA-MUN YOON),남기우(KI-WOO NAM) 한국해양공학회 2005 韓國海洋工學會誌 Vol.19 No.5
Fracture behavior and pipe strength are very important to the integrity of energy plants, ocean structures, and so forth. The pipes of energy plants and ocean structures are subject to local wall thinning, resulting from severe erosion-corrosion damage. Recently, the effects of local wall thinning on fracture strength and fracture behavior of piping systems have been the focus of many studies. In this paper, the elasto-plastic analysis is performed by FE code ANSYS on straight pipes with wall thinning. We evaluated the failure mode, fracture strength and fracture behavior, using FE analysis. Also, the effect of the axial strain on deformations and failure modes was estimated by FE analysis.