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논문 : 기계가공 ; 신선한 알루미늄 선의 집합조직 측정 및 해석
엄경근 ( Kyung Keun Um ),안중규 ( Joong Kyu An ),정효태 ( Hyo Tae Jeong ),이동녕 ( Dong Nyung Lee ) 대한금속재료학회 ( 구 대한금속학회 ) 1998 대한금속·재료학회지 Vol.36 No.6
The texture of a drawn wire was measured using a method proposed by Van Houtte. In the method, wires are glued parallel to each other on the flat sample holder. The texture of the glued flat wire specimen is measured and analyzed to obtain the texture of wire. In order to estimate the accuracy of the method, l8μm thick aluminum foil was rolled to a 1.5mm dia. tube shape. The textures of the aluminum foil and tube-shape specimens were measured and compared. The similar orientation components were found in the both specimens, but the intensities of the orientation components decreased due to the lost of information. This method was applied to the texture measurement of the drawn aluminum wire. The measured pole figures showed that the (111) fiber texture developed in the surface layer and the {111} <112> circular texture developed in the sub-surface layer.
논문 : 기계가공 ; 여러 가지 인발법으로 제조된 황동관의 잔류응력 분포
박현 ( Hyun Park ),차명환 ( Myung Hwan Cha ),엄경근 ( Kyung Keun Um ),이동녕 ( Dong Nyung Lee ) 대한금속재료학회 ( 구 대한금속학회 ) 1996 대한금속·재료학회지 Vol.34 No.11
The residual stress distributions in a brass tube drawn by a fixed back-tapered plug method have been measured by a material stripping method. The measured data are comparable with the results calculated by the elasto-plastic finite element method. The residual stress distributions in brass tubes made by sinking, and fixed tapered, fixed cylindrical and fixed back-tapered plug methods have been calculated using the finite element method. The FEM results show the development of a compressive residual stress in the inner walls and a tensile stress in the other walls of the tubes produced by the sinking and fixed tapered plug method, whereas the nature of the stresses between the inner and outer walls were switched in case of the tube made by the fixed back-tapered plug method. The lowest residual stresses develop in the tube made by the fixed cylindrical plug method.