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EH36 TMCP강 용접부의 Ni 첨가에 따른 충격 및 부식특성에 관한 연구
전재혁 ( Jae Hyeok Jeon ),홍자영 ( Ja Young Hong ),이해우 ( Hae Woo Lee ) 대한금속재료학회(구 대한금속학회) 2013 대한금속·재료학회지 Vol.51 No.1
The mechanical properties and corrosion behavior in welded EH36 TMCP steel were investigated with different Ni content and heat input. Weldments were produced by adjusting the heat input and Ni content of 0, 1.3 wt%. The acicular ferrite fraction increased as the Ni content increased. In contrast, the grainboundary ferrite and Widmanstatten ferrite decreased. The impact energy absorption increased with the addition of the Ni content and decreased as the test temperature decreased. Both tensile and yield strengths increased with either the addition of Ni or reduced heat input. As a result of the polarisation test conducted in a salt solution, the corrosion potential of the 1.3 wt% Ni added specimens was higher than the free Ni specimens.
Numerical Prediction on Siphon Break Phenomena during Defueling for an Aircraft Fuel Tank
Kang-Sik Bae(배강식),Jae Hyeok Jeon(전재혁),Ji Hoon Lee(이지훈),Edwin L. Blosch 항공우주시스템공학회 2019 항공우주시스템공학회 학술대회 발표집 Vol.2019 No.11
An investigation of the siphon break phenomena during defueling of an aircraft wing tank was performed using Computational Fluid Dynamics. A computational model was developed of a wing tank with a particular siphon break line design for which test data are available. A two-phase fuel-air model was solved with the Volume-of-Fluid method. The results indicate the model is able to predict the siphon break event dependence on defueling rate and the resultant undershoot height, measured from the fuel pool level to the siphon break line end, as well as the liquid mass flow rates inside the main pipe. It can thus be used to improve the design to reduce defuel times or assess performance for this kind of passive fuel system.