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Numerical analysis of hydroformability of three-layered tube
H. B. Xu,S. Y. Kim,S. W. Han,Y. G. Nam,Y. H. Moon 한국소성가공학회 2012 한국소성가공학회 학술대회 논문집 Vol.2012 No.5
Hydroforming is a specialized type of die forming that uses a high pressure hydraulic liquid to pressure working material into a die. The hydroforming process has the merits of weight reduction, lower tooling cost, fewer secondary operations, improved structural strength and stiffness, etc. The main objective of this study is to establish the basic understanding of the hydroformability of a three-layered tube. The three-layered tube was numerically hydroformed in a die and the hydroformability of the tubes was investigated by checking the bulging height and thickness after hydroformed. The simulation tool Dynaform 5.5 and LS-Dyna were used as the preprocessor to simulate the whole process.
Analysis of the Magnetic Properties of RFe₁₁Ti and RFe₁₁TiH (R=Tb,Ho)
S. W. Xu,Y. Yan,H. M. Jin,X. F. Wang,W. Q. Wang,F. Su 한국자기학회 2003 Journal of Magnetics Vol.8 No.4
The values of crystalline-electric-field parameters A㎚ for RFe₁₁TiHx (R=Tb,Ho) (x=0,1) are obtained by fitting calculations to the magnetization curves along the crystal axes at 4.2 K and higher temperatures. The insertion of H element in RFe₁₁Ti significantly affects CEF parameters A㎚. By using exchange field 2μ_BHex derived by inelastic neutron scattering and fitted A㎚, the calculations reproduce the experimental curves well.
Hwang, B.H.,Xu, H.,Park, S.J.,Choi, S.E.,Nahm, S.,Hong, Y.W.,Paik, J.H.,Shin, T.H.,Kang, J.S. Ceramurgica ; Elsevier Science Ltd 2016 CERAMICS INTERNATIONAL Vol.42 No.10
Hexagonal wurtzite (HWZ) ZnS nanorods were formed in specimens with a S/Zn ratio of 1.3, synthesized at temperatures ≥200<SUP>o</SUP>C in a solution containing 80vol% water and 20vol% of ethylenediamine (EN). In contrast, HWZ ZnS nanoparticles were formed in specimens synthesized at temperatures lower than 200<SUP>o</SUP>C. Also, cubic zinc blende (CZB) ZnS nanoparticles were formed in specimen synthesized in water. The absorption peak for the HWZ nanorods and CZB ZnS nanoparticles was at wavelength of 325nm and 339nm, respectively, indicating that the band gap energy of the former is larger than that of the latter. Moreover, the HWZ ZnS exhibited two emission peaks at 474nm and 580nm. The peak at 474nm is attributed to Zn vacancies but the origin of the peak at 580nm remains undetermined. Since the intensity of the emission peak at 580nm was significantly higher for the HWZ nanoparticles than for nanorods, this peak might be associated with defects in the HWZ ZnS nanoparticles.