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金澤鉉,梁仁榮 조선대학교 동력자원연구소 1983 動力資源硏究所誌 Vol.5 No.1
Surface-hardening shafts are using very much in order to satisfy the limit condition of the deformation. Thus, in this study we considered torsion characteristic from high-freguency heat treatment on the SM45C steel. We investigate the possibility of deriving stress-strain information from the torgue-twist data available from experiments. The obtained results are summarized as follows; 1) Shearing strains at the break point and the yielding point were remarkeably improved for surface hardening shafts. 2) The initial crack occurred at ※ point because of the stress concentration and the formation of surface hardening layer at the corner of key way as shown in Fig.2. 3) The structures of non-treatment materials were unstable since torsional angle has been got ten degrees.
In situ 중합으로 제조된 nylon 6-PEO copolymer/MMT 나노복합체의 물성연구
김택현,이종순,김갑진,Kim Taeck Hyun,Lee Jong Soon,Kim Kap Jin 한국섬유공학회 2004 한국섬유공학회지 Vol.41 No.6
To improve the impact strength of nylon 6 at low temperature, poly(ethylene oxide) unit was incorporated into nylon 6 main chain. This method, however, was accompanied with some unavoidable problems such as the drastic decrease in modulus and breaking strength and highly increased elongation at break. To resolve these problems, we obtained the nylon 6-PEO copolymer/montmorillonite nanocomposites chips from thein situ polymerization of $\varepsilon-caprolactam$ in the presence of 12-aminododecanoic acid intercalated montmorillonite using poly(ethylene oxide) diamine as a soft segment and 6-aminocaproic acid as a polymerization catalyst. Their structural, thermal, and mechanical properties were characterized using wide angle x-ray diffraction(WAXD), SEM, DSC, and tensile testing.
복합재료 적층판의 유한요소 해석을 위한 효율적 경계조건
김택현,김인권 한국공작기계학회 1998 한국생산제조학회지 Vol.7 No.3
This paper presents three boundary techniques which are useful for FEM analysis of composite laminates : 1) a rotational symmetric boundary technique. 2) a quasi three-dimensional boundary technique and 3) a contact boundary technique. The use of the rotational symmetric boundary technique is possible for a smaller FEM model. With the use of the quasi three-dimensional boundary technique. quasi three-dimensional analysis of composite laminates can be performed on the conventional 3-D FEM program. These techniques can readily be adopted to FEM programs.