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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal Basic Information
Journal DOI :
The Korean Society for Composite Materials
Editor in Chief :
Volume & Issues
Volume 19, Issue 6 - Dec 2006
Volume 19, Issue 5 - Oct 2006
Volume 19, Issue 4 - Aug 2006
Volume 19, Issue 3 - Jun 2006
Volume 19, Issue 2 - Apr 2006
Volume 19, Issue 1 - Feb 2006
Selecting the target year
Material Qualification, Equivalency, and Acceptance Test for Aerospace Composite Materials
Lee Ho-Sung ;
Composites Research, volume 19, issue 2, 2006, Pages 1~6
The civilian and military agencies require the use of statistic-based allowable to design aerospace vehicles with composite materials. In order to comply this regulation, it is necessary to establish relatively large amount of database, which increases test costs and time. Recently NASA/FAA developed the new method which can satisfy the regulation with smaller test matrix through AGATE(Advanced General Aviation Transport Experiments) program. Especially the concept of material equivalency is very useful when the material has been certified in previous program, and it allows the engineer to use the database with the addition of small test matrix. This paper summarizes the material equivalency and acceptance test methodology so that composite material database can be shared and improve the credibility of the material quality. As a demonstration, the material design allowable of the high temperature carbon/epoxy composite developed domestically was determined with this methodology.
Electrical and the Mechanical Properties of Graphite particle/carbon fiber hybrid Conductive Polymer Composites
Heo Seong-Il ; Yun Jin-Cheol ; Oh Kyung-Seok ; Han Kyung-Seop ;
Composites Research, volume 19, issue 2, 2006, Pages 7~12
Graphite particle/carbon fiber hybrid conductive polymer composites were fabricated by the compression molding technique. Graphite particles were mixed with an epoxy resin to impart the electrical conductivity in the composite materials. In this study, graphite reinforced conductive polymer composites with high filler loadings were manufactured to accomplish high electrical conductivity above 100S/cm. Graphite particles were the main filler to increase the electrical conductivity of composites by direct contact between graphite particles. While high filler loadings are needed to attain good electrical conductivity, the composites becomes brittle. So carbon fiber was added to compensate weakened mechanical property. With increasing the carbon fiber loading ratio, the electrical conductivity gradually decreased because non-conducting regions were generated in the carbon fiber cluster among carbon fibers, while the flexural strength increased. In the case of carbon fiber 20wt.% of the total system, the electrical conductivity decreased 27%, whereas the flexural strength increased 12%.
Parametric Study on Design of Composite-Foam Sandwich Structures for Micro EDM Machine tool structures
Kim Dae-Il ; Chang Seung-Hwan ;
Composites Research, volume 19, issue 2, 2006, Pages 13~19
In this paper, parametric study was carried out to design sandwich structures for EDM machines controlling stacking sequence, stacking thickness of composites and rib configuration. Sandwich structures which are dealt with in this paper are composed of fibre reinforced composite for skin material and foam or resin concrete for core materials. The sandwich column has cruciform rib to enhance bending stiffness of the structure and the bed has several vertical ribs to resist the normal forces and vibration. The design parameters such as rib thickness and stacking sequence were controlled to enhance the system robustness. Finite element analysis was also carried out to verify the variation of static and dynamic stiffness of the structures according to the variation of the parameters. Vibration tests were performed to verify the natural frequencies and damping ratios of the manufactured composite structures. The appropriate shape and configuration conditions for micro-EDM machine structures are proposed.
On the Development of Hybrid Composites with Non-Woven Tissue
Lee Seung-Hwan ; Noguchi Hiroshi ; Cheong Seong-Kyun ;
Composites Research, volume 19, issue 2, 2006, Pages 20~27
The hybrid composite materials with non-woven tissue (NWT) was developed to improve the mechanical properties of conventional FRP composite materials. The hybrid prepreg with NWT consists of FRP prepreg and NWT prepreg. The NWT prepreg consists of NWT and polymer resin. The NWT has short fibers, discretely distributed with in-plane random orientation fibers. The purposes of this study of hybrid prepreg with NWT are (i) to increase the interlaminar properties(the fracture toughness and strength), (ii) to improve the mechanical properties and reliability, while maintaining a low cost, (iii) to introduce a tough and strong interlayer at critical positions to be required of strength in the laminate. To accomplish the above purposes, a production technique to decrease voids in NWT layers was proposed in this paper. The interlaminar failure characteristics of laminated composite materials was tremendously improved by hybrid concept with NWT.
Study on material properties of
Kim Ji-Soon ; Chang Myung-Gyu ; Yum Young-Jin ;
Composites Research, volume 19, issue 2, 2006, Pages 28~34
] metal matrix composites with various weight fractions of
were fabricated by combination of manufacturing process, SPS (self-propagating high-temperature synthesis) and SPS (spark plasma sintering). The feasibility of
composites for welding electrodes and sliding contact material was investigated through experiments on the tensile properties, hardness and wear resistance. To obtain desired properties of composites, composites are designed according to reinforcement's shape, size and volume fraction. Thus proper modeling is essential to predict the effective material properties. The elastic moduli of composites obtained by FEM and tensile test were compared with effective properties from the original Eshelby model, Eshelby model with Mori-Tanaka theory and rule-of-mixture. FEM result showed almost the same value as the experimental modulus and it was found that Eshelby model with Mori-Tanaka theory predicted effective modulus the best among the models.
A Study on the Application Case in Civil Structures of Fiber Reinforced Composites (Bridges)
Han Bog-Kyu ; Hong Geon-Ho ; Kim Ki-Soo ;
Composites Research, volume 19, issue 2, 2006, Pages 35~41
FRPs have been used widely and demonstrated in the field of aero industries etc., and began to be used as new construction materials of civil structures. Pre-stressing tendons, reinforcing bars etc. are all examples of the many diverse applications of FRP in new structures. Especially, 40 of all-FRP bridges were reported. The reason why FRP composites were used fur construction materials of civil structures, has been that the working time and the cost of maintenance can be reduced because of the effect of their lightness and durabilities. The purpose of this paper is to report the examples of the many diverse applications of Fiber Reinforced Plastic in construction materials of civil structures.
Intelligent Textile System Research Center, ITRC
Kang T.J. ;
Composites Research, volume 19, issue 2, 2006, Pages 42~45