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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal DOI :
The Korean Society for Composite Materials
Editor in Chief :
Volume & Issues
Volume 24, Issue 6 - Dec 2011
Volume 24, Issue 5 - Oct 2011
Volume 24, Issue 4 - Aug 2011
Volume 24, Issue 3 - Jun 2011
Volume 24, Issue 2 - Apr 2011
Volume 24, Issue 1 - Feb 2011
Selecting the target year
Preparation and characterization of water-soluble polyaniline/carbon nanotube composites
Lee, Jea-Uk ; Jo, Won-Ho ; Lee, Won-Oh ; Byun, Joon-Hyung ;
Composites Research, volume 24, issue 6, 2011, Pages 1~6
DOI : 10.7234/kscm.2011.24.6.001
A new water-soluble and self-doped poly(styrenesulfonic acid-graft-aniline), PSSA-g-PANI, for dispersing carbon nanotubes (CNTs) in water was synthesized and its ability to stabilize aqueous CNT dispersions was examined. It was observed that the PANI in PSSA-g-PANI, which has benzoid and quinoid structure, was strongly adsorbed onto the nanotube surface via a strong
interaction, and thus only gentle sonication causes exfoliation of CNT ropes to small bundles and the long-term stability of their resulting dispersions was much better than commercial surfactants. Furthermore, when thin films of PSSA-g-PANI/CNT are prepared from aqueous dispersion and their electrical conductivities are measured by the four probe technique, it is observed that their conductivities are in the range of 1.5-2.5 S/cm.
Effect of Urethane Modification on the Anti-Bullet Property of Dyneema/vinylester Composites
Yoon, T.H. ; Cha, Y.M. ; Yuck, J.I. ; Paik, J.G. ; Oh, Y.J. ; Kim, H.J. ;
Composites Research, volume 24, issue 6, 2011, Pages 7~11
DOI : 10.7234/kscm.2011.24.6.007
Polyurethane oligomers (PUOs) such as UA8297, UP127 and EB8200 were utilized to enhance the anti-bullet property of Dyneema
/vinylester composites. First, prepregs of PUO and vinylester (XSR10) were prepared via spray coating on Dyneema
fabric at 21 % resin content (by volume). In addition, spray coating and film lamination were also carried out with a mixture of XSR10/PUO for selected PUOs. Next, the prepregs were dried at RT for 1-2 h and then at
for 30 min to remove the solvent and to provide partial cure when necessary. The prepregs were stacked in 24 layers and cured at
for 5 min under the contact pressure and for additional 25 min at 150
. Finally, the anti-bullet properties of composite samples were evaluated by measuring
with simulated fragment projectile (SFP, 17 gr). The results showed a 6.5 and 9.0 % increase of
with UP127 and EB8200, respectively.
Interfacial Durability and Electrical Properties of CNT or ITO/PVDF Nanocomposites for Self-Sensor and Micro Actuator
Gu, Ga-Young ; Wang, Zuo-Jia ; Kwon, Dong-Jun ; Park, Joung-Man ;
Composites Research, volume 24, issue 6, 2011, Pages 12~17
DOI : 10.7234/kscm.2011.24.6.012
Interfacial durability and electrical properties of CNT or ITO coated PVDF nanocomposites were investigated for self-sensor and micro actuator applications. Electrical resistivity of nanocomposites for the durability on interfacial adhesion was measured using four points method via fatigue test under cyclic loading. CNT/PVDF nanocomposite exhibited lower electrical resistivity and good self-sensing performance due to inherent electrical property. Durability on the interfacial adhesion was good for both CNT and ITO/PVDF nanocomposites. With static contact angle measurement, surface energy, work of adhesion, and spreading coefficient between either CNT or ITO and PVDF were obtained to verify the correlation with interfacial adhesion durability. The optimum actuation performance of CNT or ITO coated PVDF specimen was measured by the displacement change using laser displacement sensor with changing frequency and voltage. The displacement of actuated nanocomposites decreased with increasing frequency, whereas the displacement increased with voltage increment. Due to nanostructure and inherent electrical properties, CNT/PVDF nanocomposite exhibited better performance as self-sensor and micro actuator than ITO/PVDF case.
Effect of Surface Treatments with Flame Plasma and Silane on Mechanical Properties of Silica Reinforced Elastomeric Composites
Lee, Jun-Man ; Ryu, Sang-Ryeoul ; Lee, Dong-Joo ;
Composites Research, volume 24, issue 6, 2011, Pages 18~24
DOI : 10.7234/kscm.2011.24.6.018
The effect of surface treatments with the atmospheric pressure flame plasma (APFP) and epoxy silane (ES) is experimentally investigated to yield the best mechanical properties of silica (
) reinforced elastomeric composites. The tensile strength of the composites is increased significantly with decrease the mean diameter. When the diameter is
, that of the composite is increased about 1.4 times compared to the matrix (2.52 MPa). Also, the tensile strength of silica reinforced composites with APFP and ES treated is increased 8.8~13.3%, 9.9~12.5%, respectively. When the diameter is
, the tensile modulus of the composite is increased about 2 times compared to the matrix (0.88MPa), and the tensile modulus of silica reinforced composites with APFP and ES treated is increased 15.6~22.8%, 21.1~5.8%, respectively. Conventional silane coupling agent treatment have a few disadvantages because of using organic solvents. However APFP treatment is a fast, economic and eco-friendly method to improve the mechanical properties.
Design and Manufacturing of Multiscale Hybrid Composites for Electromagnetic Interference Shielding
Ngouanom, Joel Renaud Gnidakouong ; Kim, Myung-Soo ; Park, Hyung-Wook ; Park, Young-Bin ; Jung, Young-Bok ; Jeong, Ho-Soon ;
Composites Research, volume 24, issue 6, 2011, Pages 25~30
DOI : 10.7234/kscm.2011.24.6.025
This paper presents an experimental study on the enhancement of electromagnetic shielding (EMI) properties of glass fiber, carbon fiber, and glass-carbon fiber composites by adding layers of multi-walled carbon nanotubes (MWCNTs). In the case of glass-fiber composites, spraying 0.1~0.2 g of MWCNT over a fiber area of
in thickness) resulted in significant improvement in EMI shielding effectiveness (SE). Also, when applying multiple MWCNT layers, it was more effective to place the layers concentrated near the center of the composite rather than spreading them out. On the contrary, inherently conductive carbon fiber and glass-carbon fiber composites did not show appreciable improvement with the addition of MWCNT layers. In order to maximize the effectiveness of carbon nanomaterials as EMI shielding fillers, it is imperative to understand the effect of these materials on various EMI shielding mechanisms and their interactions.
Impact of Fiber Projection from GMT-Sheet Moldings on Surface Unevenness
Kim, Hyoung-Seok ; Kim, Jin-Woo ; Kim, Yong-Jae ; Lee, Dong-Gi ;
Composites Research, volume 24, issue 6, 2011, Pages 31~36
DOI : 10.7234/kscm.2011.24.6.031
According to the evaluation on GMT-sheet by molding conditions, fiber projection on the moldings surface was investigated. Fiber projection is one of the major defects on moldings surface due to matrix shrinkage. That is, fiber projection happens from different shrinkage of matrix and glass fiber. Height of fiber projection from moldings surface becomes smaller when molding pressure is higher during holding pressure and cooling process. Height of fiber projection is dominantly affected by molding pressure. With consideration of molding pressure, the formation of surface unevenness and change in fiber projection height was elucidated. In addition, coating layer is effective to suppress surface defects, and there is no fiber projection or crack in case that coating is applied. Coating layer improves surface roughness up to the level of the polypropylene which is a single material.
Elastic Analysis in Composite Including Multiple Elliptical Fibers
Lee, Jung-Ki ;
Composites Research, volume 24, issue 6, 2011, Pages 37~48
DOI : 10.7234/kscm.2011.24.6.037
A volume integral equation method (VIEM) is introduced for the solution of elastostatic problems in an unbounded isotropic elastic solids containing interacting multiple isotropic or anisotropic elliptical inclusions subject to remote uniaxial tension. The method is applied to two-dimensional problems involving long parallel elliptical cylindrical inclusions. A detailed analysis of stress field at the interface between the matrix and the central inclusion is carried out for square and hexagonal packing of the inclusions. Effects of the number of isotropic or anisotropic elliptical inclusions and various fiber volume fractions for the circular inclusion circumscribing its respective elliptical inclusion on the stress field at the interface between the matrix and the central inclusion are also investigated in detail. The accuracy and efficiency of the method are examined through comparison with results obtained from analytical and finite element methods. The method is shown to be very accurate and effective for investigating the local stresses in composites containing isotropic or anisotropic elliptical fibers.
Study on the Damage Characteristics Under the High-Velocity Impact of Composite Laminates Using Various Sensor Signals
Cho, Sang-Gyu ; Kim, In-Gul ; Lee, Seok-Je ; You, Won-Young ;
Composites Research, volume 24, issue 6, 2011, Pages 49~55
DOI : 10.7234/kscm.2011.24.6.049
The use of advanced composite materials in main structures of military and civil aircraft has been increased rapidly because of their considerable metals in high specific strength and stiffness. However, the mechanical properties of composite materials may severely degrade in the presence of damage. Especially, the high-velocity impact such as a hailstorm, and a small piece of tire or stone during high taxing, can cause considerable damage to the structures and sub-system in spite of a very small mass. However, it is not easy to detect the damage in composite plates using a single sensor or any conventional methods. In this paper, the PVDF sensors and AE sensors were used for monitoring high-velocity impact damage initiation and propagation in composite laminates. The WT(wavelet transform) is used to decompose the sensor signals. In the PVDF sensor and AE sensor signal analysis, amounts of high-frequency signals are increased when the impact energy is increased. PVDF sensor and AE sensor signal appeared similar results. This study shows how various sensing techniques can be used to characterize high-velocity impact damage of advanced composite laminates.
Photovoltaic performance evaluation of the bonded single crystalline silicon solar cell on composite specimens under mechanical loading
Kim, Jong-Cheon ; Choi, Ik-Hyeon ; Kim, Dae-Hyun ; Jeong, Seong-Kyun ;
Composites Research, volume 24, issue 6, 2011, Pages 56~63
DOI : 10.7234/kscm.2011.24.6.056
The objective of this study is to investigate appropriate bonding methods of solar cells in order to apply solar cells, which have been receiving particular attention as a renewable energy due to fossil energy depletion and environment issues, to composite structures. Back-contact solar cells with approximately 24.2% energy conversion efficiency were used in this study. Since silicon-based solar cells are mechanically fragile, the secondary-bonding methods using adhesive were examined in this study. The experiment was conducted with three kinds of bonding materials such as EVA film, Resin film and elastic adhesive. The performance of solar cells for three types of adhesives under mechanical loading on test specimens is conducted. In addition, the measuring equipment was designed to evaluate the performance of the solar cells under mechanical loading in real time and the fracture characteristics depending on bonding materials were evaluated. The reason decreasing solar cells efficiency were analyzed and considered by Fractography. The results show that the solar cell performance is largely affected by bonding techniques. Moreover, the bonding method using elastic adhesive shows best solar cell efficiency.