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안장호(Jang Ho Ahn),이도성(Do Seong Lee),박기석(Ki Suk Park),정승영(Seung Young Chung),박문선(Moon Sun Park),김승민(Seong Min Kim) 대한두개저학회 2016 대한두개저학회지 Vol.11 No.2
Chondroblastoma is a rare, benign primary bone tumor that typically develops the epiphyses of long bones. Chondroblastoma of the skull is very rare and it had been reported that the most cases of the skull occurred in the squamous portion of the temporal bone. We reported the very rare case of chondroblastoma of the sphenoid sinus presenting right sided optic neuropathy that was treated with endoscopic surgery, followed by open craniotomy and tumor removal.
CAE를 통한 하이브리드 용접 후 차체부품 변형예측 및 검증
이덕영(Dug Young Lee),최보성(Bo Sung Choi),최원호(Won Ho Choi),안장호(Jang Ho Ahn) Korean Society for Precision Engineering 2012 한국정밀공학회지 Vol.29 No.1
In recent years, laser-arc hybrid welding has begun to be adopted for assembly welding of automotive bodies and parts, because the hybrid welding process can weld lapped steel sheets having a larger gap than is possible with laser welding. In this paper, to predict the twist deformation by the hybrid welding when brackets are welded in B pillar of a passenger car, the residual stress using CAE is analyzed and the deformation result of CAE is compared with the measured deformation. First of all, after modeling heat source as intended to be expressed with laser-arc hybrid welding method, heat source fitting is done with welding conditions and a section of welding part obtained through specimen test. In case of heat source functions, laser used conical source and arc used double ellipsoid source. Through the local model analysis, elements which are located in the center of the model are selected. The elements are called WME(Welding Macro Element). This WME is extruded in the welding lines and welding phenomenon of complex parts is accomplished. The deformation amount after hybrid welding is got through a simulation, the validity of simulation is verified by measuring the panel and comparing with the simulation result.
Cu-Nb 미세복합재료의 미세구조의 안정성 및 강화기구 : (2) 강화기구 (2) Strengthening Mechanism
홍순익,안장호 대한금속재료학회(대한금속학회) 1999 대한금속·재료학회지 Vol.37 No.5
In this study, the deformation and fracture behavior of the Cu-Nb microcomposites fabricated by the bundling and drawing process was investigated. The yield strength of a Cu-20% Nb microcomposite was predicted by modifying the model of Verhoeven et al. It was assumed that the substructural strengthening in pure Cu and Nb phase fully contribute to the yield strength of Cu-Nb microcompoaite, σ_(Cu-Nb), at low draw strains (η $lt; 5.5). At high drawing strains (η $gt; 5.5) where the microstructural scale of the Cu matrix is limited by Nb filaments, the contribution of the partial grain boundaries (connecting the edge of Nb filaments) to the strength was assumed to be proportional to (λ/W_(Nb))^½ The good agreement between the yield stress predicted in this study and the experimental data at drawing strains between 6 and 9.5 supports the suggestion of the present study that the effectiveness of substructure strengthening of Cu and Nb in heavily deformed Cu-Nb microcomposites is much lower than that expected from the yield strength of heavily deformed Cu and Nb. The yield stress of the Cu-Nb microcomposite fabricated by the bundling and drawing process was found to be in good agreement with the predicted yield stress of the present model. At drawing strains above 10, Nb filaments reached a thickness of approximately 10 ㎚ and there after further working resulted in random rupture of the filaments rather than continued plastic deformation and thinning, which may result in the slower increase of the strength than the predicted values with drawing strain.