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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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Effect of Moisture Absorption on the Shear Strength of Fiber-reinforced Composites
Kim, Yun-Hae ; Kim, Kook-Jin ; Han, Joong-Won ; Jo, Young-Dae ; Bae, Sung-Youl ; Moon, Kyoung-Man ; Kim, Dong-Hun ;
Composites Research, volume 21, issue 2, 2008, Pages 1~7
Composite materials are currently used in aero-space industry, sport and leisure industry but it has many problems such as mechanical properties deterioration by moisture absorption. In this study, we appraised interlaminar shear strength with specimen that immersed/ immersed-dried in water environment(distilled/sea) during
days. In the result, properties degradation of resin part and silan part by moisture absorption is judged early on main cause of interlaminar shear strength, and later destruction of mechanical bonding between silan part and fiber by moisture absorption is Judged later main cause of interlaminar shear strength. In conclusion, the recovery of interlaminar shear strength is judged to difficult due to interfacial destruction by moisture when pass over irreversible by moisture in composite material.
A Study on Degradation and Recovery Mechanisms of Composites under the Moisture Environment
Kim, Yun-Hae ; Kim, Kook-Jin ; Han, Joong-Won ; Jo, Young-Dae ; Bae, Sung-Youl ; Moon, Kyoung-Man ;
Composites Research, volume 21, issue 2, 2008, Pages 8~14
Decrease of strength in composite material is generally caused by water absorption. It makes fracture of material, and loss of money or human lives. The objective of this study is to investigate the causes of decrease in strength by water absorption. Mechanism of water absorption was supposed as three steps. This mechanism is consisted of absorption into resin, absorption between resin and surface treatment agent, and delamination between fiber and resin. Conditions of test were supplied differently; kinds of fiber and resin, immersion time etc. Both of reversible reaction and irreversible reaction occurred simultaneously. Most of decrease in strength was finished at 2.5% water absorption, and the strength was recovered. At 4% water absorption, most of decrease was caused by irreversible reaction, therefore, there was a tendency not to be recovered in strength.
A Study on the Low Speed Impact Response and Frictional Characteristics of Shear Thickening Fluid Impregnated Kevlar Fabrics
Lee, Bok-Won ; Lee, Song-Hyun ; Kim, Chun-Gon ; Yoon, Byung-Il ; Paik, Jong-Gyu ;
Composites Research, volume 21, issue 2, 2008, Pages 15~24
In this study, shear thickening fluid (STF) filled with rigid nano silica particles was impregnated in plain woven Kevlar fabrics to improve the impact resistance performance. The nano silica particles with an average diameter of 100nm, 300nm, and 500nm were used to make shear thickening fluid to estimate the effect of particle size on the impact behavior of STF impregnated Kevlar fabrics. The yam pull-out and frictional tests were conducted to estimate the effect of impregnated STF on the frictional characteristics. The test results showed that the friction forces were dramatically increased at the STF onset shear strain rates that were measured in preliminary rheology tests. The low speed impact tests were performed using the drop test machine. The results showed that the impregnated STF improved the impact resistance performance of the Kevlar fabrics in terms of the impact energy absorption and the deformation. It has been shown through tests that the impregnated STF affects the interfacial friction which contributes to improve the energy absorption in the Kevlar fabrics. Especially, the impregnation of the STF with the smaller particle size into the Kevlar fabrics showed the better performance in impact energy absorption.
A novel hemispherical microbond specimen for evaluating the interfacial shear strength of single fiber composite
Park, Joo-Eon ; Choi, Nak-Sam ;
Composites Research, volume 21, issue 2, 2008, Pages 25~30
A hemispherical microbond specimen adhered onto single carbon fiber has been proposed for evaluating the interfacial shear strength between epoxy and carbon fiber. Hemispherical microbond specimens showed low interfacial shear strength data and its small standard deviation as compared with the droplet one, which seemed to be caused by the reduction of the meniscus effects and of the stress concentration in the region contacting with the tip of pin hole. In comparison with the droplet specimen the hemispherical specimen showed the shear stress distribution similar to the cylindrical one in that low stress concentration arose around the contacting region. Average interfacial shear strength obtained by the hemispherical ones represented a good correlation with the hardness of the epoxy matrix.
Preparation of polymer composites containing hollow magnetic particles and measurement of their electromagnetic properties
Yi, Jin-Woo ; Lee, Sang-Bok ; Kim, Jin-Bong ; Lee, Sang-Kwan ; Park, Ki-Yeon ;
Composites Research, volume 21, issue 2, 2008, Pages 31~35
In order to design light weight and high efficient electromagnetic wave absorbing materials, hollow magnetic particles have been introduced in this study. The electroless plating method has been utilized to coat Ni and Fe on the substrates of synthesized polystyrene particles of submicron size. Removing polystyrene particles by heat treatment resulted in hollow structures. Observation by SEM, TEM and EDS confirmed the surface morphology and coating thickness of Ni and Fe. Polymeric composites containing hollow particles were tested in order to compare the electromagnetic properties between Ni coated and Fe costed particles. The composite of 30 wt% Fe hollow particles showed the higher complex permeability than Ni hollow particles or the conventional barium ferrite particles.
Monitoring of Bridge Structure using Fiber Brags Grating Sensors
Kim, Ki-Soo ; Cho, Seong-Kyu ;
Composites Research, volume 21, issue 2, 2008, Pages 36~40
Recently structural monitoring using fiber optic sensors became popular, but the fiber sensors are very difficult to apply to the real structure due to thin and fragile shape of the fiber. In this research, we developed the fiber sensor packages easy to attach or fasten to the structures and apply to the real bridge structure for measuring the strains and shape changes. The applied fiber optics sensors show the behavior of the bridge girders which have several cracks in the structure.