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서유덕(Yu-Deok Seo),윤성기(Sung-Kie Youn) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
Recently, spline finite element analysis was proposed for the purpose of direct interaction between modeling and numerical analysis. In this method, spline basis functions and control points which determine geometries play the same roles with shape functions and nodes in FEM, respectively. Since the CAD data of geometries such as NURBS(Non-Uniform Rational B-Splines) are employed for numerical analysis, finite element analysis can be performed in natural way with efficiency and geometrically exact analysis results can be obtained. In this work, for the integration of analysis and optimization, structural optimization approach incorporating with spline finite element analysis is presented. Control points are used as design variables and spline basis functions are used to represent geometry, field variables and optimal design. The validity and efficiency of the proposed approach is verified by applying benchmarking problems.
서유덕(Yu-Deok Seo),김현중(Hyun-Jung Kim),박상훈(Sang-Hoon Park),김지연(Ji-Yeon Kim),엄태경(Tae-Kyoung Uhm),윤성기(Sung-Kie Youn),이상률(Sang-Ryool Lee),이승훈(Seung-Hoon Lee),이덕규(Deog-Gyu Lee),이응식(Eung-Shik Lee),장홍술(Hong-Su 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
Optical performance of mirror for satellite camera is highly dependent on the adhesive properties of its support. Therefore, in order to design the mirror with high optical performance, the mechanical properties of adhesives should be well defined. In this paper, the mechanical properties of three kinds of space adhesives are studied. First, the elastic moduli of the adhesives are investigated. Tension tests of the adhesives are performed at some chosen temperatures within the prescribed temperature range. From the tension test results, the elastic moduli of the adhesives are expressed as a function of temperature and the sensitivity with respect to temperature are discussed. Secondly, the adhesive strengths of the adhesives are investigated by the lap shear test. The lap shear tests are performed with Zerodur-to-metal lap shear specimen as well as metal-to-metal one. And it is also investigated whether reliable adhesive strength can be secured after the specific thermal cycle.