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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal DOI :
The Korean Society for Composite Materials
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Volume & Issues
Volume 21, Issue 6 - Dec 2008
Volume 21, Issue 5 - Oct 2008
Volume 21, Issue 4 - Aug 2008
Volume 21, Issue 3 - Jun 2008
Volume 21, Issue 2 - Apr 2008
Volume 21, Issue 1 - Feb 2008
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Development of Optimization Code of Type 3 Composite Pressure Vessels Using Semi-geodesic algorithm
Kang, Sang-Guk ; Kim, Myung-Gon ; Kim, Cheol-Ung ; Kim, Chun-Gon ;
Composites Research, volume 21, issue 1, 2008, Pages 1~7
Composite vessels for high pressure gas storage are commonly used these days because of their competitive weight reduction ability maintaining strong mechanical properties. To supplement permeability of composite under high pressure, it is usually lined by metal, which is called a Type 3 vessel. However, it has many difficulties to design the Type 3 vessel because of its complex geometry, fabrication process variables, etc. In this study, therefore, GUI (graphic user interface) optimal design code for Type 3 vessels was developed based on semi-geodesic algorithm in which various factors of geometry and fabrication variables are considered and genetic algorithm for optimization. In addition, hydrogen vessels for 350/700 bar that can be applied to FCVs(fuel cell vehicles) were designed using this code for verification.
Electrical and Optical Properties of Carbon Nanotube Networks Formed on Glass Substrate by Dip-Coating Method
Jang, Eui-Yun ; Kang, Tae-June ; Im, Hyung-Wook ; Kim, Dae-Weon ; Kim, Yong-Hyup ;
Composites Research, volume 21, issue 1, 2008, Pages 8~15
Single-walled carbon nanotube networks(SWNT-networks) were uniformly formed on a glass substrate by the dip-coating method. The changes of electrical and optical properties of SWNT-networks were investigated with respect to processing variables including number of dip, concentration of SWNT-colloidal solution, withdrawal velocity. Consequently, the sheet resistance and transmittance of the SWNTs-networks were sensitively controlled by the processing variables. The networks have highly uniform sheet resistance and optically excellent transmittance within the range of visible ray.
Curing of Epoxy Resin with Natural Cashew Nut Shell Liquids
Nah, Chang-Woon ; Go, Jin-Hwan ; Byun, Joon-Hyung ; Hwang, Byung-Sun ;
Composites Research, volume 21, issue 1, 2008, Pages 16~21
The cure behavior of epoxy resin with a conventional amide-type hardener(HD) was investigated in the presence of castor oil(CO), cashew nut shell liquid(CNSL) and CNSL-formaldehyde resin(CFR) by using a dynamic differential scanning calorimetry(DSC). The activation energy of curing reaction was also calculated based on the non-isothermal DSC thermograms at various heating rates. An one-stage curing was noted in the case of epoxy resin filled with CO, while the epoxy resin with CNSL and CFR showed a two-stage curing process. A competitive cure reaction was noted for the epoxy resin/CNSL(or CFR)/HD blends. In the absence of HD, the CFR showed lower values of curing enthalpy than that of CNSL. The activation energy of epoxy resin curing increased with increasing the CNSL and CFR loading.
A Study on Crashworthiness and Rollover Characteristics of Low-Floor Bus made of Honeycomb Sandwich Composites
Shin, Kwang-Bok ; Ko, Hee-Young ; Cho, Se-Hyun ;
Composites Research, volume 21, issue 1, 2008, Pages 22~29
This paper presents the evaluation of crashworthiness and rollover characteristics of low-floor bus vehicles made of aluminum honeycomb sandwich composites with glass-fabric epoxy laminate facesheets. Crashworthiness and rollover analysis of low-floor bus was carried out using explicit finite element analysis code LS-DYNA3D with the lapse of time. Material testing was conducted to determine the input parameters for the composite laminate facesheet model, and the effective equivalent damage model for the orthotropic honeycomb core material. The crash conditions of low-floor bus were frontal accident with speed of 60km/h. Rollover analysis were conducted according to the safety rules of European standard (ECE-R66). The results showed that the survival space for driver and passengers was secured against frontal crashworthiness and rollover of low-floor bus. Also, The modified Chang-Chang failure criterion is recommended to predict the failure mode of composite structures for crashworthiness and rollover analysis.
Optimal Design of Laminated Stiffened Composite Structures using a parallel micro Genetic Algorithm
Yi, Moo-Keun ; Kim, Chun-Gon ;
Composites Research, volume 21, issue 1, 2008, Pages 30~39
In this paper, a parallel micro genetic algorithm was utilized in the optimal design of composite structures instead of a conventional genetic algorithm(SGA). Micro genetic algorithm searches the optimal design variables with only 5 individuals. The diversities from the nominal convergence and the re-initialization processes make micro genetic algorithm to find out the optimums with such a small population size. Two different composite structure optimization problems were proposed to confirm the efficiency of micro genetic algorithm compared with SGA. The results showed that micro genetic algorithm can get the solutions of the same level of SGA while reducing the calculation costs up to 70% of SGA. The composite laminated structure optimization under the load uncertainty was conducted using micro genetic algorithm. The result revealed that the design variables regarding the load uncertainty are less sensitive to load variation than that of fixed applied load. From the above-mentioned results, we confirmed micro genetic algorithm as a optimization method of composite structures is efficient.
Durability Test and Micro-Damage Formation of Rubber Hose for Automotive Hydraulic Brake
Kwak, Seung-Bum ; Choi, Nak-Sam ; Lim, Young-Han ;
Composites Research, volume 21, issue 1, 2008, Pages 40~45
Rubber hose assembly for automotive hydraulic brake during operation is subject to combined stresses of cyclic pressure, cyclic bending and torsion as well as thermal load. The rubber hose is composed of ethylene-propylene diene monomer(EPDM) rubber layers reinforced by polyvinyl acetate(PVA) braided fabrics. A durability tester with loading rigs for inducing the above cyclic stresses was used to investigate failure mechanisms in the rubber hose assembly. Failure examination was performed at every 100 thousands cycles of bending and torsion. Hose samples were sectioned with a diamond-wheel cutter and then polished. The polished surface was observed by optical microscope and scanning electron microscope (SEM). Some interfacial delamination with a length of about 1mm along the interface between EPDM rubber and PVA fabrics was shown at the test cycles of 400,000. The delamination induced some cracking into the outer rubber skin layer to leading the final rupture of the hose.