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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 26, Issue 6 - Dec 2013
Volume 26, Issue 5 - Oct 2013
Volume 26, Issue 4 - Sep 2013
Volume 26, Issue 3 - Jun 2013
Volume 26, Issue 2 - Apr 2013
Volume 26, Issue 1 - Feb 2013
Selecting the target year
Nanocarbon Polymer Composites
Choe, Chul Rim ;
Composites Research, volume 26, issue 3, 2013, Pages 147~154
DOI : 10.7234/composres.2013.26.3.147
Nanocarbons such as carbon nanotubes (CNT) and graphene are considered to be ideal fillers for polymer composites, because of their outstanding mechanical properties and high length-to-diameter ratio. There has been much effort to realize the implementation of their full potential, but a large number of unsolved problems still must be challenged, for example, effective processing for fabrication. This review deals with the progress that has already been made in the area of nanocarbon polymer composites using CNT and graphene. Mechanical reinforcement of various nanocarbon polymer composites is analyzed and compared, and future perspectives in research and development that need to be done are discussed.
Review : Continuous Fiber Tow Spreading Technologies and Its Applications
Roh, Jeong U ; Lee, Woo Il ;
Composites Research, volume 26, issue 3, 2013, Pages 155~159
DOI : 10.7234/composres.2013.26.3.155
This paper reviewed the continuous fiber tow spreading technologies and its applications. The effect of the continuous fiber tow spreading in manufacturing process of continuous fiber reinforced thermoplastic composite was introduced theoretically. The fiber tow spreading technologies were categorized according to the spreading medium and its order during manufacturing process. The general principles, the applications, and the merits and demerits of fiber tow spreading technologies were introduced. Furthermore, the proposal for future direction of research on this issue was considered in this study.
Strength Increase of Medium Temperature-carbonized PAN Nano Fibers Made by Mechano-electrospinning
Kim, J.H. ; Bajaj, B. ; Yoon, S.J. ; Kim, S.H. ; Lee, J.R. ;
Composites Research, volume 26, issue 3, 2013, Pages 160~164
DOI : 10.7234/composres.2013.26.3.160
In this study, the effect of phosphoric acid (PA) as a fiber spinning aid on the strength increase of polyacrylonitrile (PAN) nano-fibers by using modified mechano-electrospinning technologies has been analyzed. The medium carbonization temperature of
has been selected for the future economic production of these new materials. The concentration of PAN in dimethyl sulfoxide (DMSO) was fixed as 5 wt%. The weight fraction of PA was selected as being 2%, 4%, 6%, and 8% in comparison to PAN. These solutions have been used to make the nanofibers. The mechano-electrospinning apparatus installed in KRICT was made by our own design. By using this apparatus the continous and highly aligned precursor nano-fibers have been obtained. The bundle of 50 well aligned nano diameter continuous fibers with the diametr of 10 microns with 6 wt% phosphoric acid for addition showed maximum mechanical properties of 1.6 GPa as tensile strength and 300 GPa as Young's modulus. The weight of final product can be increased 19%, which can improve the economical benefits for the application of these new materials.
Water Uptake and Tensile Properties of Plasma Treated Abaca Fiber Reinforced Epoxy Composite
Paglicawan, Marissa A. ; Basilia, Blessie A. ; Kim, Byung Sun ;
Composites Research, volume 26, issue 3, 2013, Pages 165~169
DOI : 10.7234/composres.2013.26.3.165
This work presents the tensile properties and water uptake behavior of plasma treated abaca fibers reinforced epoxy composites. The composites were prepared by vacuum assisted resin transfer molding. The effects of treatment on tensile properties and sorption characteristics of abaca fiber composites in distilled water and salt solution at room temperature were investigated. The tensile strength of the composites increased with plasma treatment. With plasma treatment, an improvement of 92.9% was obtained in 2.5 min exposure time in plasma. This is attributed to high fiber-matrix compatibility. Less improvement on tensile properties of hybrid treatment of sodium hydroxide and plasma was obtained. However, both treatments reduced overall water uptake in distilled water and salt solution. Hydrophilicity of the fibers decreased upon plasma and sodium hydroxide treatment, which decreases water uptake.
Study of Plasma Polymerization on Wood Powder/PP Composites Interface
Ha, Jong-Rok ; Kim, Byung Sun ; Yi, Jin Woo ;
Composites Research, volume 26, issue 3, 2013, Pages 170~174
DOI : 10.7234/composres.2013.26.3.170
Atmospheric glow plasma polymerization was applied to wood powder before fabricating polypropylene (PP) matrix composites. Seven different types of monomers (Oxygen, Benzene, CH4, Acrylic-acid, Hexafluoroethane, Trifluorotolune, Hexamethyl-disiloxane) were analyzed to determine the most suitable precursor for plasma polymerization. The surface energy was calculated from measured contact angle about each monomer on PP. Hexamethyl-disiloxane (HMDSO) had a highest surface energy and is selected as the most suitable monomer. Wood powder and polypropylene were mixed as pellets by twin screw extruder and then 50 wt% wood powder/PP composites were produced by an injection machine. Tensile strength and Flexural strength have improved by 7.59% and 12.43% at the maximum respectively. SEM (Scanning Electron Microscope) observation on the fracture surface revealed that the plasma polymerization have improved the interfacial bonding and the mechanical properties of the composites.
The Experimental Study on the Absorbed Energy of Carbon/Epoxy Composite Laminated Panel Subjected to High-velocity Impact
Cho, Hyun-Jun ; Kim, In-Gul ; Lee, Seokje ; Woo, Kyeongsik ; Kim, Jong-Heon ;
Composites Research, volume 26, issue 3, 2013, Pages 175~181
DOI : 10.7234/composres.2013.26.3.175
The evaluation and prediction for the absorbed energy, residual velocity, and impact damage are the key things to characterize the impact behavior of composite laminated panel subjected to high-velocity impact. In this paper, the method to predict the residual velocity and the absorbed energy of Carbon/Epoxy laminated panel subjected to high velocity impact are proposed and examined by using quasi-static perforation test and high-velocity impact test. Total absorbed energy of specimen due to the high-velocity impact can be grouped with static energy and kinetic energy. The static energy are consisted of energy due to the failure of the fiber and matrix and static elastic energy, which are related to the quasi-static perforation energy. The kinetic energy are consisted of kinetic energy of moving part of specimen, which are modelled by three modified kinetic model. The high-velocity impact test were conducted by using air gun impact facility and compared with the predicted values. The damage area of specimen were examined by C-scan image. In the high initial impact velocity above the ballistic limit, both the static energy and the kinetic energy are known to be the major contribution of the total absorbed energy.
Polymerization Shrinkage and Stress of Silorane-based Dental Restorative Composite
Lee, In-Bog ; Park, Sung-Hwan ; Kweon, Hyun-Jeong ; Gu, Ja-Uk ; Choi, Nak-Sam ;
Composites Research, volume 26, issue 3, 2013, Pages 182~188
DOI : 10.7234/composres.2013.26.3.182
The purpose of this study was to measure the volumetric polymerization shrinkage kinetics and stress of a silorane-based dental restorative composite and compare it with those of conventional methacrylate-based dental composites. Two methacrylate-based composites (Z250, Z350 flowable) and one silorane-based composite (P90) were investigated. The volumetric polymerization shrinkage of the composites during light curing was measured using a laboratory-made volume shrinkage measurement instrument based on the Archimedes' principle, and the polymerization stress was also determined with the strain gage method. The shrinkage of silorane-based composites (P90) was the lowest, and that of Z350 flowable was the highest. Peak polymerization shrinkage rate was the lowest in P90 and the highest in Z350 flowable. The time to reach peak shrinkage rate of P90 was longer than those of the methacrylate-based composites. The polymerization shrinkage stress of P90 was lower than those of the methacrylate-based composites.
Impact and Fire Retardant Properties of Flax Fiber Reinforced Nanoclay Composites by Taguchi Method
Won, Cheon ; Kim, Jin-Woo ; Lee, Dong-Woo ; Kim, Byung-Sun ; Song, Jung-Il ;
Composites Research, volume 26, issue 3, 2013, Pages 189~194
DOI : 10.7234/composres.2013.26.3.189
This paper deals with the study of mechanical properties and impact energy absorbed by composites, made by using thermoplastic and thermoset as matrix, flax fiber and nanoclay as reinforcements. The nanoclay was sprayed on the fiber laminate directly after mixing with ethanol. This experiment designed by Taguchi method and have variable factors, i.e three types of fiber direction(F), three different nanoclay wt%(N) and three spray gun hole shapes(S). According to these conditions, composites were made and the optimum conditions were found to be F1N3S1, F1N2S1, F1N2S1 and F3N2S1 for thermoplastic, and F1N3S2, F1N3S2, F1N2S2 and F3N2S1 for thermoset which were matched with tensile strength, modulus, total impact absorbed energy and heat release rate respectively.
Barely Visible Impact Damage Detection Analyses of CFRP by Various NDE Techniques
Lim, Hyunmin ; Lee, Boyoung ; Kim, Yeong K. ;
Composites Research, volume 26, issue 3, 2013, Pages 195~200
DOI : 10.7234/composres.2013.26.3.195
This study aims to detecting and analyzing the defects of damaged carbon fiber reinforced composites after impacts, particularly focusing on barely visible impact damages. The impact test was progressed by a drop-weight machine and applied to introduce simulated damages on laminated composites used in aircrafts. Various nondestructive testing (NDT) techniques were applied to identify the defects on the specimens with different levels of impact energies. Based on the measurements data, the levels of the barely visible impacts, and the applicability and effectiveness of the detection methods were discussed. Generally, the results demonstrated that their inner damages contained bigger footprints than those on the surfaces. However, when the damage energy was low, it was found that the inner damage size could be smaller than those appeared on the surfaces.
Electrical Resistance Measurement in Characterizing the Internal Damage of Carbon Nanotube/Polypropylene Nanocomposites
Kim, Hak-Soo ; Kwon, Dong-Jun ; Wang, Zuo-Jia ; Gu, Ga-Young ; Kim, Dae-Sik ; Lee, Chun-Soo ; Park, Joung-Man ;
Composites Research, volume 26, issue 3, 2013, Pages 201~206
DOI : 10.7234/composres.2013.26.3.201
The electrical resistance measurement was investigated as a damage monitoring method. In this study, 0.5 wt% Carbon nanotube reinforced polypropylene (CNT/PP) composites were evaluated under compressive fatigue loading. The shape of specimens was
curved round type. Compression strength and electrical resistance were measured at different sections of specimen during compression. The microcracks of CNT/PP composites were detected based on the changing ratio of electrical resistance. Micro-damage during compressive fatigue test could be detected by electrical resistance measurements. The reason is that the contact points of CNTs in composites decreased under fatigue loading. During compressive fatigue test, larger change of electrical resistance was detected at the microcrack sections. It was proved that microcracks could be detected by electrical resistance measurement under compression test, whereas the real delamination parts were consistent with the predicted results by electrical resistance measurement.