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任意의 Crack을 가진 正三角形棒의 K_Ⅲ/M_z에 關한 硏究
黃在錫 영남이공대학 1979 論文集 Vol.8 No.-
Up to now, there is no analysis on the Kr/M: in the cas where equilateral triangular bar with partial crack is under pure torsional moment. In this paper, an arbitrary circular bar which is equal to the torsional rigidity factor of equilateral triangular bar has the similar external partial crack as the equilateral triangular bar on the boundary condition. And then, the theoretical equation of the circular bar with crack is nearly in accord with experimental analysis of equilateral triangular with crack under pure torsional moment. Therefore. Stress analysis of equilateral triangular with crack under pure torsional moment can analyzed as equivalent circular bar under pure torsional moment which has the saint; torsional rigidity factor as torsional rigidity factor of equilateral triangular bar. the equation of 9a resulted from using membrane analogy in this paper is shown by equation(21).
回轉圓板의 應力擴大係數에 관한 硏究 : Stress Freezing Method of Photoelastic Experiment
최선호,이충섭,권재도,황재석 嶺南大學校 工業技術硏究所 1986 연구보고 Vol.14 No.2
It is well known fact that the stress distributions in the vicinity of crack tip and fracture problems are governed by stress intensity factor which is presented as a function of the crack shape, boundary condition and loading mode etc. In. the determination of the stress intensity factor, there are many theoritical and experimental methods. Among them the stress freezing method of photoelastic experiment has been considered to be one of the most accurate experimental methods which have been used for stress analysis. In this paper, this method was applied to the rotating disk with inner arbitrary crack. The results of photoelastic experiment for disk with various straight cracks, radial and others which are oblique to the radical direction were as follows. In case of radial crack, in comparison with the results of photoelastic experiment obtained by stress freezing method and the theoritical solutions of Blauel, stress freezing method is fully available for analysis of uniform dynamic status.
Jae-guk Suh,Jai-sug Hawong,Dong-chul Shin 대한기계학회 2003 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.17 No.11
Photoelastic experiment has two significant problems. The first problem is manufacturing a model specimen for complicated shapes of structures. The second problem is residual stress contained in the photoelastic model material. In this paper, the stress optic law that can be effecitvely used on photoelastic model materials with residual stress is developed. By using the stress optic law as developed in this research, we can obtain good results in photoelastic experiments using model material in which residual stress is contained. It is assured that the stress optic law developed in this research is useful. Therefore, it is suggested that the stress optic law considering residual stress can be applied to the photoelastic experiment for the stress analysis of the composite materials or bi-materials in which the residual stress is easily contained.
Suh, Jae-guk,Hawong, Jai-sug,Shin, Dong-chul The Korean Society of Mechanical Engineers 2003 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.17 No.11
Photoelastic experiment has two significant problems. The first problem is manufacturing a model specimen for complicated shapes of structures. The second problem is residual stress contained in the photoelastic model material. In this paper, the stress optic law that can be effectively used on photoelastic model materials with residual stress is developed. By using the stress optic law as developed in this research, we can obtain good results in photoelastic experiments using model material in which residual stress is contained. It is assured that the stress optic law developed in this research is useful. Therefore, it is suggested that the stress optic law considering residual stress can be applied to the photoelastic experiment for the stress analysis of the composite materials or bi-materials in which the residual stress is easily contained.
직교이방성/직교이방성 이종재료의 등속균열 선단 부근의 동적모드Ⅲ 응력장과 변위장에 관한연구
유재용(Jae-Yong Yu),황재석(Jai-Sug Hawong) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.5_2
In the problems of bimaterial fracture mechanics, it is important to understand stress and displacement on the interface of bimaterial studied. Especially, a crack contained in the interface of the bimaterial has more complicated and dangerous fracture behavior than a crack contained in general meterial does. Therefore, the fracture problems of an interface crack in the bimaterial has been studied by many researchers.<br/> When the interface crack is propagated with constantvelocity along the interface of bimaterial composed of orthotropic and orthotropic material under dynamic mode Ⅲ. The general dynamic stress fields and displacement field (eqts.28,29,30) are derived. It is assured that they are effectived.<br/>
純粹 비틀림을 받는 正多角形棒의 最大剪斷應力에 對한 硏究
崔善浩,黃在錫 嶺南大學校 工業技術硏究所 1976 연구보고 Vol.4 No.1
It has been recognized as impossibility to have a solution which dominates the complete stress distribution in theoretical aspect with the exception of a few cases in which the boundary conditions are simple enough. In this paper, bars having regular polygonal cross sections under pure tortion was thoroughly examined experimentally using membrane analogy method utilizing Laser beam. When this experimental method was applied to the solution-known simple sections, ie; square and circular, it was confirmed that the results were more than satisfactory in terms of coincidence with the solution derived from the elastic theory. Moreover, in dealing with the n-polygonal sections, it was also observed that the experiment oriented solution was exactly coincided with that of circular section when n approaches to infinite. Thus, the experimentally derived fomula pertaining to the factor of , proved itself to be quite applicable with great accuracy to the stress distributional solution of any regular-polygonal sections. Nomenclature: Ai : Area of largest inscribed circle in a cross-section. A。 : Area of cross-section. J : Torsional rigidity factor. ø : Warping function ??: Polar moment of inertia about z axis of n regular-poly-gon Ri : Radius of largest inscribed circle in a cross-section. R。 : The largest distance from the center of largest inscribed circle to the boundary of the cross-section. δ : Wave-length of He-Ne laser(6328Å) τ : Resultant shearing stress Mz : Torque about the z axis. V : Actural volume of the membrane under pressure. : The maximum slope of the deformed membrane at arbiturary point on the membrane. λ : the linear geometric length proportion of ctural-cross-setion to the experimental model Yn : Height of fringes under pressure. Ym : Heihgt of fringes under pressure-removed. V₁ : Volume enclosed by the fringes under pressure. V₂ : Volume estimated by initial fringes.
崔善浩,黃在錫,金鍾周,李在守,徐仁輔,朴熙代 嶺南大學校 工業技術硏究所 1986 연구보고 Vol.14 No.1
Many studies on the initial crack propagation direction have been carried and the various criterions of the crack propagation direction have been proposed for several years. In this thesis, modified maximum tangential stress(modified ? criterion) and modified minimum strain energy density (modified S criterion) are developed by considering ? to the stress distributions in the vicinity of crack tip. The term of ? on the stress distribution in th vicinity of crack tip is a significant factor for the prediction of initial crack propagation angle. In the results of this study and the actual fracture test of epoxy plate, modified ? criterion and modified S criterion have a good consistency with the practical fracture angles. Modified S criterion is more available than modified ? criterion for the prediction of fracture angle.