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A Study on Durability of Seat Height Motor Gear by Angle
한문식,조재웅 한국기계가공학회 2019 한국기계가공학회지 Vol.18 No.8
In this study, structural and fatigue analyses of the motor gears that control the height of car seat were carried out at angles of 10°, 20°, and 30°. The study aims at examining which angle of the gear is superior in terms of effect on strength. In the structural and fatigue analyses, the force of 3136 N was applied to the gears, and the stress and deformation were obtained. As the analysis results, model B (30°) is suggested to have the best strength and fatigue durability among the three models.
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한문식,김상철 한국마린엔지니어링학회 1985 한국마린엔지니어링학회지 Vol.9 No.2
In this paper, temperature distribution and thermal stress are investigated considering engine peak pressure and the time average temperature distribution in the piston under running conditions for the marine diesel engine. The induced stress are calculated by the Finite Element Method (FEM). The results obtained are summerized as follows. 1) The results calculated by the FEM present good agreement with other numerical solution in literatures. 2) It is comfirmed that the maximum compressive stresses are induced in the part of outside wall between the piston crown and the pin bush 3) In the axial direction, the hoop stresses are changed its sign at the portion of crown near the inner wall side. 4) Large gradient of temperature is shown in the piston crown near the side wall in the axial direction, in the part between the piston crown and the pin bush in radial direction. 5) In case of stress distribution of piston wall surface in the axial direction, the hoop stress is a little greater than axial stress, and the latter is greater than the radial stress.
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한문식,김상철 한국마린엔지니어링학회 1982 한국마린엔지니어링학회지 Vol.6 No.1
One of the important subjects in fracture mechanics study is to analyze the stress intensity factor. In this paper, the stress intensity factor in Mode I ($K^{I}$) is determined by J-integral using the finite element method. In this investigation, the values of $K^{I}$ are computed for distorted and undistorted elements of 8-noded isoparametric finite elements. The numerical results obtained are summarized as follows. (1) Through a relatively coarse mesh, the $K^{I}$ values obtained by this method are fairly good accuracy. (2) The $K^{I}$ values for the distorted elements appear to be better than those obtained using the undistorted mesh. (3) Within the limits of these analyses, the solutions obtained through the integral paths in the medium region of elements approach to the analytical solution most closely.
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한문식,박태인,Han, Mun-Sik,Park, Tae-In 한국기계연구원 1985 기계연구원소보 Vol.15 No.-
In this paper, temperature distribution and thermal stress are investigated considering engine peak pressure and the time average temperature distribution in the piston under running conditions for the diesel engine. The induced stress are calculated by the Finite Element Method(FEM). The results obtained are summerized as follows. 1) The results calculated by the FEM present good agreement with other numerical solution in literature. 2) It is confirmed that maximum compressive stress are induced in the part of outside wall between the piston crown and the pin bush. 3) In the axial direction, the hoop stresses are changed its sigh at the portion of crown near the inner wall side 4)Large gradient of temperature is shown in the piston crown near the side wall in the axial direction, in the part between the piton crown and the pin bush in radical direction 5)in case of stress distribution of piston wall surface in the axial direction, the hoop stress is a little greater than axial stress, and the latter is greater than the radial stress
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박용 구조물용 일반압연강 용접부의 피로균열 전파거동에 미치는 $K_{II}$의 영향
한문식,김상철 대한용접접합학회 1988 대한용접·접합학회지 Vol.6 No.3
An experimental study was carried out to identify the fatigue fractue behavior of weld zone in generally rolled steel for marine structure. The bending an shear loads were applied simultaneously on the specimens to simulate real load condition for marine structure. The effect of the stress intensity factor under mode I with II loading condition on the initiation and the propagation of a crack were investigated, with particular emphaiss on mode II. When the $K_{II}$ stress intensiy factor in mode II was applied under mode I load condition, the growth behavior of a crack seems to be affected mainly by the anisotropic characteristic of materials. Especially, when the crack was located in and near the weld zone and parallel to th weld line, the propagation behaviour was turned out to be quite different from that of the base metal along the direction transverse to the weld line. In general, the propagation veiocity of the cracks in and near the weld zone was found to be slower that the velocity in base metal.
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Experimental Study on the Fatigue Crack Propagation Behavior of DCB Specimen with Aluminum Foam
한문식,조재웅,최해규,조종두 한국정밀공학회 2013 International Journal of Precision Engineering and Vol.14 No.8
Adhesive processing is increasingly used with bonding method for joined structures. Gathering fracture toughness data regarding the bonded joint is essential to render bonded structures safe. However, researches centering on the strength evaluation of bonding joints for bonded structures of aluminum foam, which has excellent mechanical properties like light weight and impact absorption, are lacking. In this study, DCB test specimen built of aluminum foam is fabricated by the British Standard (BS) and the International Standard Organization (ISO) guidelines. Fatigue test is performed with mode I for DCB test specimen. The fatigue test results with the four types of test specimens with beam heights as parameters show progressed crack within a few cycles as beam height increases. Meanwhile, the energy release rate per crack length becomes higher as the beam height decreases. The fracture behavior of actual composite material bonded by aluminum foam can be analyzed through the correlation of results obtained by tests. The mechanical properties of actual composite structure can be understood by utilizing the bonded aluminum foam.
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