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홉킨슨 압력봉법을 이용한 Fe-6.5wt.%Si 합금의 고변형률속도 거동
Yoon, Young-Ki,Yoon, Hi-Seak,Umakoshi, Yukichi,Yasuda, Hiroyuki Y. 대한기계학회 2001 大韓機械學會論文集A Vol.25 No.7
Many researches have published numerous papers about the high-strain-rate obtained from Split Hopkinson Pressure Bar(SHPB) tests. And 6.5wt%Si steel is widely known as an excellent magnetic material because its magnetostriction is nearly zero. Single crystals are prepared by the Floating Zone(FZ) method, which melts the alloy by the use of a high temperature electron beam in a pure argon gas condition. In this paper, the fracture behavior of the poly crystals and single crystals (DO$_3$phase) of Fe-6.5wt%Si alloy by SHPB test is observed. The comparison of high-strain-rate results with static results was done. Obtained main results are as follows: (1) Fe-6.5wt%Si alloy has higher strength at high-strain-rate tensile. SHPB results of polycrystal are twice as high as static results. (2) From the fractography, the cleavage steps are remarkably reduced in the SHPB test compared with the static test.
Bong Su Kang,Sunghak Choi,Shogo Taguchi,Keishi Suga,Hiroshi Umakoshi,Keesung Kim,Moon Kyu Kwak,Hosup Jung 한국정밀공학회 2024 International Journal of Precision Engineering and Vol.11 No.2
Although a microfluidic technique for vesicle synthesis has drawn attention in the biomedical field due to its superiority in size control and monodispersity, it has suffered from the extraction of residual solvent. Previous studies attempted the solvent-free microfluidic method using the bicelle-to-vesicle transition, but only a limited size of vesicles was obtained with low membrane properties on account of inefficient mixing. In this paper, we suggest the solvent-free and non-stimulus method for the vesicle preparation using a microfluidic chip with different types of mixing structures, among which the tilted-type structure performed an efficient mixing. With this micromixer, lipid vesicles can be continuously obtained at high yields by diluting bicelle solutions composed of DMPC (1,2-dimyristoyl-sn-glycero-3-phosphocholine) and DHPC (1,2-dihexanoyl-sn-glycero-3-phosphocholine). After passing through the microfluidic chip, DMPC bilayer domain coalesced and formed vesicle, while DHPC could dissolve into an aqueous phase. The membrane properties of the vesicles exhibited a highly ordered phase, indicating that DHPCs were removed from transitioned vesicles after dilution in a microfluidic chip. Moreover, by controlling the dilution ratio, vesicles of various sizes ranging from 90 to 480 nm with an enhanced monodispersity can be obtained without any additional process.