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이열화,김재영,김헌주,박경민,김종환 한국군사과학기술학회 2001 한국군사과학기술학회지 Vol.4 No.1
The main purpose of this paper is to investigate strength characteristics of Aluminum 2024-T3 in high temperature environment. Tensile test of Aluminum 2024-T3 has been carried out in high temperature environment. The stress-strain relations are investigated with temperature and Young's modulus, yield strength and ultimate strength are deduced from the test results. The modulus and strength of the test are compared with those of MIL HANDBOOK and tips on structural design in high temperature environment are suggested.
균일분포 온도하의 두꺼운 복합 재료 적층판의 열적 좌굴 해석
이영신,이열화,양명석,박복선,이종수,Lee, Young-Shin,Lee, Yeol-Wha,Yang, Myung-Seog,Park, Bock-Sun,Lee, Jong-Soo 대한기계학회 1993 대한기계학회논문집 Vol.17 No.7
In this paper, the thermal buckling of thick composite angle-ply laminates subject to uniform temperature distribution is studied. For the plates of 4-edges simply supported condition and those of 4-edges clamped condition, the critical buckling temperatue is derived, using tile finite element method based on the shear deformation theory. The effects of lamination angle, layer number, laminate thickness, plate aspect ratio and boundary constraints upon the critical buckling temperature are presented.
이영신,이열화,나문수 대한기계학회 1990 대한기계학회논문집 Vol.14 No.6
본 연구에서는 Kam과 Chang의 연구와 같이 판의 최소 처짐, 판의 최대 모달 에너지 감쇠비 및 최대 고유 진동수를 설계제한 조건으로 택하고 Watkins와 Morris가 사용한 순환 선형 계획법을 이용하여 혼합 적층 복합 재료판의 최적설계를 수행하였다. In this paper, optimization procedures are presented considering the static and dynamic constraints for laminated composite plate and hybrid laminated composite plate subject to concentrated load on center of the plates. Design variables for this problem are ply angle or ply thickness. Deflection, natural frequency and specific damping capacity are considered as constraints. Using a recursive linear programming method, the nonlinear optimization problems are solved. By introducing the design scaling factor, the number of iterations is reduced significantly. Composite plates could be designed optimally combined with FEM analysis under various conditions. In the optimization procedure, verification for both analysis and design of the laminated composite plates are compared with the results of the others. Various design results are presented for the laminated composite plates and hybrid laminated composite plates.
최대 열적 좌굴하중을 갖는 두꺼운 복합재료 적층판의 설계
이영신,이열화,양명석,박복선,Lee, Young-Shin,Lee, Yeol-Wha,Yang, Myung-Seog,Park, Bock-Sun 대한기계학회 1993 대한기계학회논문집 Vol.17 No.7
In this paper, the design of thick laminated composite plate subjected to thermal buckling load under uniform temperature distribution is presented. In the design procedures of composite laminated plates for maximum thermal buckling load. the finite element method based on shear deformed theory is used for the analysis or laminated plates. One-demensional search method is used to find optimal fiber orientation and, in the next step, optimal thickness is investigated. Design variables such as fiber orientation and ply thicknesses coefficient of plates are adopted. The optimal design for the symmetric or antisymmetric laminated plates consisted of 4 layers with maximum thermal buckling load is performed.
신영석,양해석,황철규,이열화 한국군사과학기술학회 1999 한국군사과학기술학회지 Vol.2 No.2
The stiffness of joint parts in the finite element beam model are corrected by the direct comparison between the modal test and analysis model. The corrected stiffness are reviewed according to the boundary conditions of modal testing. For the improved modal test/analysis correction, more modes measured than acceleration sensors are used to make a minimal order system model. In addition, the initial F.E. model is reduced to the degrees of freedom of a minimal order system model, keeping the dynamics of the initial model. Finally, for the parametric correction of the reduced model, the submatrices are used to model the initially assumed stiffness.
신영석,황철규,양해석,이열화,Shin Young-Sug,Hwang Cheol-Gyu,Yang Hae-Seok,Lee Yeol-Wha 한국군사과학기술학회 2004 한국군사과학기술학회지 Vol.7 No.4
In order to model a connection part between a control fin and actuator, the related characteristics of a dynamic stiffness were extracted from experiments. These characteristics include the static stiffness of a control fin and the dynamic stiffness of an actuator, so they are called the mixed dynamic stiffness here. This mixed dynamic stiffness is used as the boundary condition of a control fin connected to an actuator when the flutter characteristics are analyzed. The simulated stiffness of an actuator is corrected from the experiment results and the mixed dynamic is finally formulated in the domain of frequencies.