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샌드위치구조의 Edgewise압축실험과 Flatwise 전단실험에 대한 연구
金益泰(Ik-Tai Kim) 한국해양공학회 1996 韓國海洋工學會誌 Vol.10 No.2
This paper is aimed to solve local buckling problem that can frequently occur when the high speed ship’s hull of sandwich structural type is crushed by harbour and cargo. Experiment is performed on 36 specimens cut of 4-plates that made of sandwich type(Kevlar-Epoxy, Klegecell foam) and 16-Edgewise compressive test specimen, 16-Flatwise test specimen were tested by A.S.T.M. test method.<br/> The result of this study is analyzed and compared in test method and test jig to perorm Edgewise compressive test and Flatwise test.
2차 접착된 Sandwich 구조의 굽힘에 관한 실험연구
김익태(Kim Ik Tai) 한국해양환경·에너지학회 2015 한국해양환경·에너지학회 학술대회논문집 Vol.2015 No.11
2차 보강 접착을 한 FRP sandwich 보에 대한 굽힘 거동 특성을 실험적으로 연구하였다. 굽힘 실험을 위해 시편의 면재는 chopped Mat 300-450, roving clothes 570을 사용하였고, resin 과 hardener의 비율을 55:45로 하여 제작하였다. 이 연구의 주요 목적은 double-strap-joint 로 2차 보강한 샌드위치 보의 정확한 굽힘 거동특성을 알기 위해서이고, 2차 보강 접착을 이용한sandwich 구조의 설계, 유지 및 보수 시의 2차 보강 ply의 두께 및 길이 결정을 제안했다. It has made a special study of bending behavior of FRP sandwich beams with bonded 2nd-reinforced plies. Specimen"s faces were made of Chopped Mat 300-450, Roving Clothes 570 and the mixture weight ratio of Resin versus hardener was 55:45 for bending analysis. The purpose of this paper is to study the exact bending behavior of bonded area"s deflection and stiffness depends upon various bonded FRP (2nd reinforced ply) length and thickness on which covered joints and to find the optimum design for the sandwich structures. All results and suggestions are based on experiment and using thick face calculation.
얇은면재를 갖는 F.R.P. 샌드위치 평판에 대한 구조해석
金益泰 홍익대학교 산업기술연구소 1994 産業技術 Vol.3 No.-
A sandwich element is a special hybrid structural form of the composite construction, which is consisted of equal two orthotropic, stiff and strong sheets of dense material separated symmetrically by an isotropic thick layer which is much less stiff and strong. This study analyzed the variation of the bending stress, membrane bending stress, shear stress of faces, shear stress of core, maximum deflection and mode shapes of sandwich plates depending on material properties, thicknesses and stacking orientation of faces and three types of core material by applying Rayleigh-Ritz Energy Method. Stresses and deflection obtained by Rayleigh-Ritz Energy method were compared with NISA FEM solution.
金益泰 홍익대학교 산업기술연구소 1996 産業技術 Vol.6 No.-
A sandwich element is a special Hybrid structural form of the composite construction, which is consisted of three main parts : thin, strong, stiff and relatively high density faces separated by a thick, light, and weaker core material. In a sandwich construction, the Wrinkling stresses of faces are of great importance since the core is a very thick in comparison with the thickness of the faces. Therefore, For the engineering purpose of sandwich panel design, the results are tabulated, which are calculated by using the In This paper is aimed to solve local buckling problem that can frequently occur when the high speed ship's hull of sandwich structural type is crushed by harbour and cargo. Experiment is performed on 16 specimens cut of 4-plates that made of sandwich type(Kevlar-Epoxy, di foam) and test specimen were tested by A.S.T.M test method. The result of this study is analyzed and compared in test method and test jig to perform Edgewise comperssive test.
접착된 F.R.P 구조와 Foam Core 샌드위치구조에 대한 수치 강도 해석
金益太,朴炯旼 弘益大學校 産業技術硏究所 2004 産業技術 Vol.14 No.-
A sandwich element is a special hybrid structural form of the composite construction, which is consisted of equal two orthotropic, stiff and strong sheets of dense material separated symmetrically by an isotropic layer which is much less stiff and strong. This study analyzed the variations of the stresses and strains of sandwich plates depending on material properties, thicknesses and stacking orientation of faces and three types of core material with simple hand-lay up F.R.P plates by computational method.