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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 28, Issue 6 - Dec 2015
Volume 28, Issue 5 - Oct 2015
Volume 28, Issue 4 - Aug 2015
Volume 28, Issue 3 - Jun 2015
Volume 28, Issue 2 - Apr 2015
Volume 28, Issue 1 - Feb 2015
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Carbon Fiber Tow Spreading Technology and Mechanical Properties of Laminate Composites
Park, Sung Min ; Kim, Myung Soon ; Choi, Yoon Sung ; Lee, Eun Soo ; Yoo, Ho Wook ; Chon, Jin Sung ;
Composites Research, volume 28, issue 5, 2015, Pages 249~253
DOI : 10.7234/composres.2015.28.5.249
This paper reports a study on a method for achieving lightweight thermoplastic laminate composites referred to as tow spreading technology. Thickness of an unspread 12 K carbon fiber tow is reduced by increasing the tow width from 7 mm to 20 mm. The polypropylene (PP) film was used to stabilize and impregnate the spread tow, covering it into a partially consolidated prepreg: 12 K carbon fiber spread tow/PP. Laminates were fabricated from the spread tow prepreg and control laminate composites were produced from unspread tow prepreg consisting of 12 K carbon fiber and PP. The void content, tensile and flexural properties of the composite laminates were investigated. Consequently, the spread tow laminate composite exhibited lower void content and improved mechanical properties.
Carbon Fiber/Aluminum Composite Fabrication Using Wettability Control
Lee, Yongbeom ; Park, Sangjin ; Han, Jun Hyun ;
Composites Research, volume 28, issue 5, 2015, Pages 254~259
DOI : 10.7234/composres.2015.28.5.254
Carbon fiber/aluminum (CF/Al) composites were successfully fabricated without pressure casting using wettability modification of carbon fiber. The wettability of liquid aluminum on carbon fibers was enhanced through electroless plating of copper on carbon fibers. Liquid aluminum was well infiltrated into carbon fiber bundles with Cu coating layer due to low wetting angle, and a lot of pores that existed in CF/Al composite without Cu coating on CF were greatly removed. However, a few tiny pores existed in carbon fiber bundles, which is due to not bad wettability between CF and Al but shrinkage cavity that was generated during cooling of CF/Al composite. The tiny pores could be effectively removed by a subsequent rolling.
Prediction of Thermo-mechanical Behavior for CNT/epoxy Composites Using Molecular Dynamics Simulation
Choi, Hoi Kil ; Jung, Hana ; Yu, Jaesang ; Shin, Eui Sup ;
Composites Research, volume 28, issue 5, 2015, Pages 260~264
DOI : 10.7234/composres.2015.28.5.260
In this paper, molecular dynamics (MD) simulation was carried to predict thermo-mechanical behaviors for carbon nanotube (CNT) reinforced epoxy composites and to analyze the trends. Total of six models having the volume fractions of CNT from 0 to 25% in epoxy were constructed. To predict thermal behaviors, temperature was increased constantly from 300 to 600 K, and the glass transition temperature (
) and coefficient of thermal expansion (CTE) analyzed using the relationship between temperature and specific volume. The elastic moduli that represented to the mechanical behaviors were also predicted by constant strain. Additionally, the effects of functionalization of CNT on mechanical behaviors of composite were analyzed. Models were constructed to represent CNTs functionalized by nitrogen doping and COOH groops, and interfacial behaviors and elastic moduli were analyzed. Results showed that the agglomerations of CNTs in epoxy cause by perturbations of thermo-mechanical behaviors, and the functionalization of CNTs improved the interfacial response as well as mechanical properties.
Preparation of Amine-functionalized Graphene Fiber and Its Application
Lee, Wonoh ; Yoon, Sang Su ; Um, Moon-Kwang ; Lee, Jea Uk ;
Composites Research, volume 28, issue 5, 2015, Pages 265~269
DOI : 10.7234/composres.2015.28.5.265
Development of simple and efficient method for large-scale production of mechanically strong and electrically conductive graphene fiber is highly desirable for practical applications, such as fiber-reinforced composites, wearable electronics, and electromagnetic irradiation shielding. Here, we present a facile approach for the preparation of amine-functionalized graphene fibers by simple wet-spinning of diamine-functionalized graphene oxide (GO-
), which is used because of its synthetic convenience, good dispersity, and scalable production with low cost. The amine-functionalized graphene fiber shows high electrical and mechanical properties compared to pristine graphene oxide fiber due to the electrostatic interaction between amine groups and electronegative functional groups of graphene oxide.
Polyvilylidenefluoride-based Nanocomposite Films Induced-by Exfoliated Boron Nitride Nanosheets with Controlled Orientation
Cho, Hong-Baek ; Nakayama, Tadachika ; Jeong, DaeYong ; Tanaka, Satoshi ; Suematsu, Hisayuki ; Niihara, Koichi ; Choa, Yong-Ho ;
Composites Research, volume 28, issue 5, 2015, Pages 270~276
DOI : 10.7234/composres.2015.28.5.270
Polyvinylidene fluoride (PVDF)-based nanocomposites are fabricated by incorporation of boron nitride (BN) nanosheets with anisotropic orientation for a potential high thermal conducting ferroelectric materials. The PVDF is dissolved in dimethylformamide (DMF) and homogeneously mixed with exfoliated BN nanosheets, which is then cast into a polyimide film under application of high magnetic fields (0.45~10 T), where the direction of the filler alignment was controlled. The BN nanosheets are exfoliated by a mixed way of solvothermal method and ultrasonication prior to incorporation into the PVDF-based polymer suspension. X-ray diffraction, scanning electron microscope and thermal diffusivity are measured for the characterization of the polymer nanocomposites. Analysis shows that BN nanosheets are exfoliated into the fewer layers, whose basal planes are oriented either perpendicular or parallel to the composite surfaces without necessitating the surface modification induced by high magnetic fields. Moreover, the nanocomposites show a dramatic thermal diffusivity enhancement of 1056% by BN nanosheets with perpendicular orientation in comparison with the pristine PVDF at 10 vol % of BN, which relies on the degree of filler orientation. The mechanism for the magnetic field-induced orientation of BN and enhancement of thermal property of PVDF-based composites by the BN assembly are elucidated.
Determination of Degraded Properties of Vibrating Laminated Composite Plates for Different Layup Sequences
Kim, Gyu-Dong ; Lee, Sang-Youl ;
Composites Research, volume 28, issue 5, 2015, Pages 277~284
DOI : 10.7234/composres.2015.28.5.277
This paper presents a method to detect the fiber property variation of laminated GFRP plates from natural frequency response data. The combined finite element analysis using ABAQUS and the inverse algorithm described in this paper may allow us not only to detect the deteriorated elements from the mirco-mechanical point of view but also to find their numbers, locations, and the extent of damage. To solve the inverse problem using the combined method, this study uses several natural frequencies instead of mode shapes in a structure as the measured data. Several numerical results show that the proposed system is computationally efficient in identifying fiber stiffness degradation for complex structures such as composites with various layup sequences.
The Effect of Electrolyte-coating on the Mechanical Performance of Carbon Fabric for Multifunctional Structural Batteries
Park, Hyun-Wook ; Park, Mi-Young ; Kim, Chun-Gon ; Kim, Soo-Hyun ;
Composites Research, volume 28, issue 5, 2015, Pages 285~290
DOI : 10.7234/composres.2015.28.5.285
Multiscale multiphysics in structural batteries make mechanical property testing difficult. In this research, the effect of electrolyte-coating on the mechanical performance of carbon fabric was studied using a suitable mechanical test method for structural batteries. For this experiment, two types of specimens were determined their dimension according to ASTM. One type of specimen was smaller than the standard dimension. The specimens were coated by spreading the electrolyte material on carbon fabric, hardened using epoxy, and tested for tensile properties using universal testing machine. As a result, it was found that the mechanical properties of carbon fabric were not influenced by electrolyte coating. In addition, the small-scale specimen used in this experiment was determined to be sufficiently reliable.
A Study on Structural Design of Natural Fiber Composites Automobile Body Panel Considering Impact Load
Park, Kilsu ; Kong, Changduk ; Park, Hyunbum ;
Composites Research, volume 28, issue 5, 2015, Pages 291~296
DOI : 10.7234/composres.2015.28.5.291
In this study, structural design and analysis of the automobile bonnet is performed. The flax/vinly ester composite material is applied for structural design. The Vacuum Assisted Resin Transfer Molding-Light (VARTML) manufacturing method is adopted for manufacturing the flax fiber composite bonnet. The VARTML is a manufacturing process that the resin is injected into the fly layered-up fibers enclosed by a rigid mold tool under vacuum. A series of flax/vinyl ester composite panels are manufactured, and several kinds of specimens cut out from the panels are tested to obtain mechanical performance data. Based on this, structural design of the automobile bonnet is performed.
Multi-Objective Design Optimization of Composite Stiffened Panel Using Response Surface Methodology
Murugesan, Mohanraj ; Kang, Beom-Soo ; Lee, Kyunghoon ;
Composites Research, volume 28, issue 5, 2015, Pages 297~310
DOI : 10.7234/composres.2015.28.5.297
This study aims to develop efficient composite laminates for buckling load enhancement, interlaminar shear stress minimization, and weight reduction. This goal is achieved through cover-skin lay-ups around skins and stiffeners, which amplify bending stiffness and defer delamination by means of effective stress distribution. The design problem is formulated as multi-objective optimization that maximizes buckling load capability while minimizing both maximum out-of-plane shear stress and panel weight. For efficient optimization, response surface methodology is employed for buckling load, two out-of-plane shear stresses, and panel weight with respect to one ply thickness, six fiber orientations of a skin, and four stiffener heights. Numerical results show that skin-covered composite stiffened panels can be devised for maximum buckling load and minimum interlaminar shear stresses under compressive load. In addition, the effects of different material properties are investigated and compared. The obtained results reveal that the composite stiffened panel with Kevlar material is the most effective design.
Method for Determining Fiber Volume Fraction in Carbon/Epoxy Composites Considering Oxidation of Carbon Fiber
Kim, YunHo ; Kumar, Sathish ; Choi, Chunghyeon ; Kim, Chun-Gon ; Kim, Sun-Won ; Lim, Jae Hyuk ;
Composites Research, volume 28, issue 5, 2015, Pages 311~315
DOI : 10.7234/composres.2015.28.5.311
Measuring fiber volume fraction properly is very important in designing composite materials because the fiber volume fraction mainly determines mechanical and thermal properties. Conventional Ignition methods are effective for ceramic fiber reinforcing composite materials. However, these methods are not proper for applying to carbon fiber reinforcing composites because of the venerable characteristic against oxidation of carbon fiber. In the research, fiber volume fraction of carbon fiber composites was obtained by a thermogravimetric analysis considering oxidation characteristic of the carbon fiber and the method was compared and verified with the results from microscopic cross section images.
Effects of Microcapsules on Mechanical Properties and Thermal Stability of Microcapsule Embedded Polymeric Resins
Yoon, Sung Ho ; Kim, Min Sik ; Jang, Se Yong ;
Composites Research, volume 28, issue 5, 2015, Pages 316~321
DOI : 10.7234/composres.2015.28.5.316
This study investigated the effects of microcapsules on mechanical properties and thermal stability of the composite material containing self-healing microcapsules. To this end, tensile specimens and flexural specimens containing melamine-urea-formaldehyde (M-U-F) shell walled microcapsules with diameters of
were manufactured. Varying amount of microcapsules in the specimens was considered: 0 wt%, 0.5 wt%, and 1.0 wt%. The tensile and flexural tests were conducted to evaluate mechanical properties of the specimens containing the microcapsules and the thermogravimetric analysis test was performed to evaluate the thermal stability of the specimens containing the microcapsules. The results show that the tensile strength of the specimens was sensitive to the amount of the microcapsules compared to the tensile modulus even though the tensile modulus of the specimens was not significantly affected by the amount of the microcapsules. However, reduction of the tensile strength was not linearly proportional to the amount of microcapsules; similar results were observed in the flexural test. The weight changes of the specimens containing the microcapsules, as a function of temperature, were similar to those specimens without microcapsules. The thermal stability of the specimens was not affected significantly by the microcapsules embedded in the specimens.
A Basic Study on the Application of Composite Materials for the Light-weight LED Beacon
Yoo, Seong-Hwan ; Shin, Kyung-Ho ; Lee, Donghee ;
Composites Research, volume 28, issue 5, 2015, Pages 322~326
DOI : 10.7234/composres.2015.28.5.322
We developed the high-power LED beacon and investigated the applicability of composite materials for the light-weight design of LED beacon. By means of the application of composite materials, the vertical deformation could be reduced by 17% and the total weight of LED beacon 8.9 kg comparable to 20% light-weighting against aluminum beacon. In thermal radiation test, the maximum temperature of LED package was measured to
under ambient temperature (
), which is acceptable considering both performance and lifespan of LED packages. In this study, the applicability of composite materials was demonstrated for light-weight design of high-power LED beacon.
Design of CFRP-Metal Hybrid Pantograph Upper-arm
Jeon, Seung-Woo ; Han, Min-Gu ; Chang, Seung-Hwan ; Cho, Yong-Hyeon ; Park, Chul-min ;
Composites Research, volume 28, issue 5, 2015, Pages 327~332
DOI : 10.7234/composres.2015.28.5.327
In this research, a parametric study was carried out to design a metal-carbon fiber reinforced plastics (CFRP) hybrid pantograph for weight reduction of high speed train (KTX). To design a light-weight and high-stiffness pantograph, some parts of the original steel upper arm was replaced by CFRPs with appropriate stacking sequences. For the parametric study, steel was replaced by aluminium considering structure stiffness and weight of hybrid upperarm of a pantograph. Finite element analysis (FEA) was performed for checking the structure stiffness with varying design parameters. Static vertical load stiffness and weight changing ratio were derived from real CX-PG pantograph model analyses. From the FEA results, the geometries of high-stiffness, light-weight pantograph have been suggested.