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조석수,주원식 동아대학교 공과대학부설 생산기술연구소 1997 生産技術硏究所硏究論文集 Vol.2 No.1
In order to use superior impact properties couples to low density in laminated composites it is necessary to accommodate the anisotropic nature of resin impregnated fibers. Its stiffness is determines by stacking orientation. Genetic algorithm(GA) is probabilistic optimization technique by principle of natural genetics and natural selection and neural network(NN) is useful for prediction operation on the basis of learned data. Therefore, in this study minimum stiffness optimization of laminated composites is achieved by GA and required deflection is predicted by NN.
조석수,주원식 동아대학교 공과대학부설 생산기술연구소 1997 生産技術硏究所硏究論文集 Vol.2 No.1
Impact loads may be expected in many of the engineering applications of composites. The suitability of composites for such applications is determined not only by the usual parameters, but its impact or energy-absorbing properties. Frequently, an attempt to improve tensile properties results in a deterioration of impact properties. Therefore, it is necessaryto have a good understanding for both safe and efficient design of structures and to develop new composites suitable to service conditions. This study presents optimization techniques on the basis of genetic algorithms to minimum stiffness design of laminated composites.
조석수,장득열 三陟大學校 1997 論文集 Vol.30 No.1
Impact loads may be expected in many of the engineering applications of composites. The suitability of composites for such applications is determined not only by the usual parameters, but its impact or energy-absorbing properties. Frequently, an attempt to improve tensile properties results in a deterioration of impact properties. Therefore, it is necessary to have a good understanding for both safe and efficient design of structures and to develop new composites suitable to service conditions. This study presents optimization techniques on the basis of genetic algorithms minimum stiffness design of laminated composites.
극치통계해석을 이용한 Al 2424-T3합금의 피로강도설계에 관한연구
조석주,예규현,주원식 東亞大學校 大學院 1997 大學院論文集 Vol.22 No.-
The fracture of a structure, machine, machine part comes of surface micro-crack initiated and propagated at the root notch, where the actual stress is high. Irregular distribution characteristics of micro-crack on the basis of elastic-plastic fracture mechanics doesn't predict exactly remaining life of them. It is thought that maximum micro-crack length represents the total fatigue damage because fatigue can be characterized as a progressive failure phenomenon that proceeds by the propagation and coalescence of micro-cracks to an unstable size. The maximum micro-crack length in an area larger than the sample area can by estimated by statistics of extremes. Therefore, the remaining life of components can be accurately predicted using the distribution of micro-crack length in critical area and the fatigue model.
다축하중을 받는 적층복합재료의 강성 및 중량 최적설계에 관한 연구
조석수,주원식,장득열 동아대학교 공과대학부설 생산기술연구소 1997 生産技術硏究所硏究論文集 Vol.2 No.1
The present paper deals with the stiffness and weight optimization of laminated composites under multiaxial loading on the basis of genetic algorithms. Laminated composites are in the form of laminates consisting of multiple laminae oriented in the design directions and bonded together in a structural unit. Design variables used in optimization are layer angle and thickness. In order to prevent GA from premature convergence, subelitism is used instead of elitism. It is shown that GA is applicable to multivariable design as well as single varialbe design.
평면굽힘하중을 받는 Al 2024-T3 합금의 미소균열 분포특성에 관한 연구
조석수,주원식,장득열,장백선,안원기 동아대학교 공과대학부설 생산기술연구소 1997 生産技術硏究所硏究論文集 Vol.2 No.1
Machine structures, aircraft and pressure vessel etc. are designed by fail-safe or safe-fail concept but on the basis of existance of internal defect or crack initiation in early stage of fatigue life. Failure or fracture of machine structures is mainly occured by fatigue and relation between stress intensity factor range and crack growth rate can predict remaining life in components containing through-the-thickness crack but fatigue life of smooth specimen is dependent of initiation, growth and coalescene of micro-crack. Therefore, this paper presents relation between statistical properties of micro crack and fatigue life ratio in age-hardened Al 2024-T3 tested in-plane bending.
진화 알고리즘을 이용한 적층복합재료의 최적설계에 관한 연구
조석수,주원식 동아대학교 공과대학부설 생산기술연구소 1997 生産技術硏究所硏究論文集 Vol.2 No.1
The virtually limitless combinations of ply orientations, ply thickness and ply stacking sequences offered by laminated constructions considerably enhance the design flexibility inherent in composite structures. And it is known that evoutionary algorithms has an excellent ablility in the area of combinatorial optimazation problem. Therefore, it is necessary to optimize ply orientations, ply thickness and ply stacking sequences according to the constraint conditions using evoutionary algorithms. This paper presents optimization techniques to minimum stiffness and weight design of laminated composites.
조석수,주원식,이선봉 東亞大學校 大學院 1997 大學院論文集 Vol.22 No.-
Impact loads may be expected in many of the engineering applications of composites. The suitability of composites for such applications is determined not only by the usual parameters, but its impact or energy-absorbing properties. Genetic algorithms(GA) is probabilistic optimization technique by principle of natural genetics and natural selection and neural networks(NN) is useful for predication operation on the basis of learned data. Therefore, This study presents optimization techniques on the basis of genetic algorithms and neural networks to minimum stiffness and weight design of laminated composites.
조석수,장득열 三陟大學校 1997 論文集 Vol.30 No.1
The fracture of a structure, machine, machine part comes of surface micro-crack initiated and propagated at the root of notch, where the stress is high. Irregular distribution characteristics of micro-crack on the basis of elastic-plastic fracture mechanics doesn't predict exactly remaining life of them. It is thought that maximum micro-crack length represents the total fatigue damage because fatigue can be characterized as a progressive failure phenomenon that proceeds by the propagation and coalescence of micro-cracks to an unstable size. The maximum micro-crack length in an area larger than the sample area can be estimated by statistics of extremes. Therefore, the remaining life of components can be accurately predicted using the distribution of micro-crack length in critical areas and the fatigue damage model.
2024-T3 A1합금의 표면미소균열의 통계적 분포특성에 관한 연구
조석수,장득열 三陟大學校 1997 論文集 Vol.30 No.1
Machine structures, aircraft and pressure vessel etc. are designed by fail-safe or safe-fail concept but on the basis of existence of internal defect or crack initiation in early stage of fatigue life. Failure or fracture of machine structures is mainly occurred by fatigue and relation between stress intensity factor range and crack growth rate can predict remaining life in components containing through-the-thickness crack but fatigue life of smooth specimen is dependent of initiation, growth and colescence of micro crack. Therefore, this paper presents relation between statistical properties of micro crack and fatigue life ratio in age-hardened Al 2024-T3 tested in plane bending.