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범현규,정경문,강상현,Beom, Hyeon-Gyu,Jeong, Gyeong-Mun,Gang, Sang-Hyeon 대한기계학회 2001 大韓機械學會論文集A Vol.25 No.2
A crack with electrically conducting surfaces in a linear electrostrictive ceramic subjected to uniform electric fields is analyzed. Complete forms of electric fields and elastic fields for the crack are derived by using the complex function theory. The linear electromechanical theory predicts overlapping of the traction free crack surfaces. It is shown that the surfaces of the crack are contact near the crack tip. The contact zone size obtained on the basis of the linear dielectric theory for the conducting crack does not depend on the electric fields and depends on only the original crack and the material property for the linear electrostrictive ceramic.
정경문,범현규,Jeong, Gyeong-Mun,Beom, Hyeon-Gyu 대한기계학회 2000 大韓機械學會論文集A Vol.24 No.8
The buckling of two elastic layers bonded to a semi-infinite substrate under a transverse compressive plane strain is investigated. Incremental deformation theory, which considers the effect of the initial stress on the incremental stress field, is employed to describe the buckling behavior of both two isotropic layers and the semi-infinite substrate. The problem is converted to an eigenvalue-eigenvector case, from which the critical buckling strain and the buckling wavelength are obtained. The results are presented on the effects of the layer geometries and material properties on the buckling behavior.
균열면에 작용하는 내압과 열전달의 영향을 고려한 노즐부의 응력확대계수 해석
정민중,김영진,강기주,범현규,표창률,Jeong, Min-Jung,Kim, Yeong-Jin,Gang, Gi-Ju,Beom, Hyeon-Gyu,Pyo, Chang-Ryul 대한기계학회 2000 大韓機械學會論文集A Vol.24 No.9
In order to investigate the effect of nozzle on stress concentration in pressure vessels, three dimensional finite element analyses were performed. The results were compared with those for corresponding two dimensional axisymmetric finite element analyses. A three dimensional finite element model with a surface crack was also designed to evaluate the effect of internal pressure and heat transfer on crack face, and the resulting stress intensity factors from the finite element analyses were compared with those for ASME Sec. XI and Raju-Newman's stress intensity factor solution. As a result, the validity of currently available stress intensity factor solutions for a surface crack was reviewed in the presence of geometrical complexity, heat transfer and internal pressure.