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권영두,권혁춘,이상태,서병철 대한금속재료학회 2005 대한금속·재료학회지 Vol.43 No.2
Generally, as objects impact each other, coating layer is regarded as little affecting transmission and reflection of shock wave. However, we thought that material properties and thickness of coating layer would actually affect objects. So this paper was performed by finite element analysis (FEA) for transmission and reflection of stress wave propagation at two bars having different material properties. Also, as coating layer having different material properties was inserted between bars, we looked into the behavior of stress wave propagation and compared the result of FEA and theoretical result. As using them, FEA for actual piezo electric ceramic was performed. The damaged cause of piezo electric ceramic was confirmed by the effect of reflected wave. To decrease the effect of reflected wave, we analyzed it as changing thickness and material of coating layer and the shape of piezo electric ceramic. Afterwards, we inquired thickness and material of coating layer and the shape of piezo electric ceramic being able to minimize the effect of reflected wave. (Receivad September 30 2004)
초기응력이 있는 일단고정 Plate Strip의 선형 및 비선형해석
權永斗,徐昌敏 경북대학교 공과대학 1987 工大硏究誌 Vol.16 No.-
The set of finite element equations of motion of an initially stressed elastic solid is derived by using the principle of virtual displacement. And this is compared with what obtained from Hamilton's principle. The set of equations of motion is applied to an initially stressed fixed-free plate strip on the sudden lateral loading condition at the free end. By comparing numerical result, we shall examine the effect of incremental stresses, and the selective reduction of the order of Gauss-Legendre quadrature.
Al-Al_3Ni 複合材料의 비틀림特性에 관한 理論解析
權永斗,李永文,洪俊杓 慶北大學校 1980 論文集 Vol.30 No.-
The mechanical behavior of Al-Al_3Ni composites in torsion was analyzed. The Ludwik's equation S=Hγ^n was used as the shear stress and strain relation equation. The coefficients H and n were included in T-θ (torque-angle of twist) equation. The values of H and n were obtained by minimizing the errors between T-θ equation and the experimental data. The theoretical T-θ curves using computed values of H and n approach relatively well to the experimental data. Some discrepancy was observed in torque at a given twist angle with the solidification velocities. And so, an equation including the effect of solidification velocities was proposed without the experimental confirmation.
볼트결합부를 포함한 구조물의 정적 및 동적 해석을 위한 유한요소 모델링
권영두,구남서,김성윤,조민호,Gwon, Yeong-Du,Gu, Nam-Seo,Kim, Seong-Yun,Jo, Min-Ho 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.4
Many studies on the finite element modeling for bolted joints have proceeded, but the structures with bolted joints are complicated in shape and it is difficult to find out the characteristics according to joint condition. Usually, experimental methods have been used for bolted joint analysis. A reliable and practical finite element modeling technique for structure with bolted joints is very important for engineers in industry. In this study, three kinds of model are presented; a detailed model, a practical model and a simple model. The detailed model is modeled by using 3-D solid element and gap element, and the practical model is modeled by using shell element (a portion of bolt head) and beam element (a portion of bolt body), the simple model is modeled by simplifying practical model without using gap elements. Among these models, the simple model has the least degree of freedom and show the effect of memory reduction of 59%, when compared with the detailed model.
權永斗 경북대학교 공과대학 1977 工大硏究誌 Vol.6 No.-
The stresses in a truncated conical bar which is the standard viewports for submersibles, were obtained by differentiating the Airy stress function. The biharmonic Airy stress function with idealized boundary conditions was solved by Neou's polynomial method. In a particular problem of minor diameter=1˝, thickness=1˝, apical angle=90 deg, the maximum shear stress was appeared in highpressure face at vadius 0.75˝.
5절점 상당요소에 의한 굽힘문제의 정적해석 및 자유진동해석
권영두,윤태혁,정승갑,박현철,Gwon, Young-Doo,Yun, Tae-Hyeok,Jeong, Seung-Kap,Park, Hyeon-Chul 대한기계학회 1996 大韓機械學會論文集A Vol.20 No.4
In the present study, we consider modified 5-node equivalent solid element which has smallest degree of freedom among 2-dimensional solid elements accounting bending deformation as well as extensional and shear deformations, We shall investigate static and dynamic characteristics of this element, which is very effective in thin beam, thick beam, large displacement problems, beam of variable thickness, and asymmetrically stepped beam, etc., as well as relatively simple problems of beam. The degree of freedom of this element is 10, which is smaller than 18 of 9-node element, 16 of 8-node elemtns, 12 of modified 6-node element and Q6 element. Therefore, this element is expected to broaden the effective range of application of the solid elements in the bending problems further.
운동 참여자의 운동 동기와 지속성, 지각된 건강 상태에 관한 집단 특성 조사
권영두,이재혁 대한스포츠물리치료학회 2023 정형스포츠물리치료학회지 Vol.19 No.1
Purpose: In this study, we investigated group characteristics such as purpose, motivation, and perceivedhealth status of adults who participated in exercise across various periods and also describe exercise guidancestrategies to improve exercise participation and adherence based on the results of the survey and findingsof previous studies. Methods: The study included 69 participants who underwent short- or long-term exercise. Participants wereprovided a mixed questionnaire containing optional questions regarding the purpose of exercise participationand descriptive questions regarding their motivation for exercise participation. Perceived health status wasmeasured using a General Health Questionnaire. Results: Participants indicated muscle training (37.5%) and physical strength improvement (30.15%) as themain purpose of exercise, and the instructor (26.74%), self-realization (24.42%), and educational environment(13.95%) as motivators for exercise. Perceived health status severity and exercise persistence showed anegative correlation (R=-0.27) in contrast to exercise time per day (R=0.14) and the number of exercisesessions per week (R=0.07). Conclusion: Similar to the findings of previous studies, our study highlights that in contrast to external factors,exercise motivation for adherence should focus on improved intrinsic factors such as encouragement duringexercise coaching and that gentle guidance methods including goal setting should be used to improve exercisepersistence.