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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
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Thickness Optimization for Spar Cap of Composite Tidal Current Turbine Blade using SQP Method
Cha, Myung-Chan ; Kim, Sang-Woo ; Jeong, Min-Soo ; Lee, In ; Yoo, Seung-Jae ; Park, Cheon-Jin ;
Composites Research, volume 26, issue 4, 2013, Pages 207~212
DOI : 10.7234/composres.2013.26.4.207
In this study, the thickness optimization for uni-directional (UD) glass fiber reinforced polymer (GFRP) laminates of the spar cap of composite tidal blades was performed under the tip deflection constrains. The spar cap was composed of GFRP composites and carbon fiber reinforced polymer (CFRP) composites. The stress distributions in the blade as well as its material costs for the optimized results were additionally investigated. The optimized thickness was obtained by interacting a sequential quadratic programming (SQP) algorithm and an ABAQUS software to calculate an objective function. It was confirmed that the thickness of UD GFRP increased with a decrease of the restrained tip deflection when a thickness of UD CFRP laminates was constrained to 9 mm. The weight of the optimized spar-cap increased up to 96.2% while the maximum longitudinal tensile stress decreased up to 24.6%. The thickness of UD GFRP laminates increased with a decrease of the thickness of UD CFRP laminates when the tip deflection was constrained to 126.83 mm. The weight increased up to 40.1%, but the material cost decreased up to 16.97%. Finally, the relationships among the weight, internal tensile stress, and material costs were presented based on the optimized thicknesses of the spar cap.
Mechanical Properties of Corn Husk Flour/PP Bio-composites
Jagadeesh, Dani. ; Sudhakara, P. ; Lee, D.W. ; Kim, H.S. ; Kim, B.S. ; Song, J.I. ;
Composites Research, volume 26, issue 4, 2013, Pages 213~217
DOI : 10.7234/composres.2013.26.4.213
The focus in the present work is to study the agro-waste corn husk bio-filler as reinforcement for polypropylene. These materials have been created by extrusion and injection molding. The effect of filler content by 10, 20, 30 and 40 wt. % and mesh sizes of 50~100, 100 and 300 on the mechanical properties was studied. For the un-notched specimens, the results of flexural strength showed a declining trend with increase the filler loading and the results of impact strength showed an increasing trend with increase the mesh size. In contrast, enhanced flexural modulus was observed with increasing filler loading and size.
Effect of Slag Particle Size and Volume Fraction on Mechanical Properties of Slag Reinforced Composite
Nam, Ji-Hoon ; Chun, Heoung-Jae ; Hong, Ik-Pyo ;
Composites Research, volume 26, issue 4, 2013, Pages 218~222
DOI : 10.7234/composres.2013.26.4.218
This study demonstrated that a slag, an industrial solid waste, can be used as a structural reinforcement. The mechanical properties(tensile strength and Elastic modulus) of slag reinforced composite(SRC) was investigated as functions of slag particle size (8~12
) and volume fraction (0-40 vol.%). In order to investigate the interface and a degree of particle dispersion which have an effect on mechanical properties, optical microscopic images were taken. The results of tensile tests showed that the tensile strength decreased with an increase in slag volume fraction and particle size. The elastic modulus increased with an increase in slag volume fraction and particle size except for 30 vol.% SRC. The tensile strength decreased with an increase in slag particle size. The microscopic picture showed SRC has fine degree of particle dispersion at low slag volume fraction. SRC has a good interface at every volume fraction. However particle cluster was incorporated with an increase in slag volume fraction.
The Design of a Hybrid Composite Strut Tower for Improving Impact Resistance and Light-weight
Lee, Hyun Chul ; Oh, Hyun Ju ; Kim, Seong Su ;
Composites Research, volume 26, issue 4, 2013, Pages 223~229
DOI : 10.7234/composres.2013.26.4.223
Hybrid composite strut tower was designed to prevent permanent deformation of upper mount by the impact from the uneven road. When exceeding energy absorption capacity of tire and suspension systems, residual impact is delivered to upper mount. Especially, in case of using high-rigidity suspension system for high driving performance, the conventional strut tower can be easily deformed due to reduction of energy absorption capacity of suspension systems. In this study, optimal design of hybrid composite strut tower which made of back-up metal and carbon fiber reinforced composite was suggested by using finite element analysis, and low velocity impact test was performed to investigate their dynamic characteristics. Also, 3D measuring and ultra c-scanning methods were carried out to diagnose damages in the strut towers.
Manufacture of Continuous Glass Fiber Reinforced Polylactic Acid (PLA) Composite and Its Properties
Roh, Jeong U ; Lee, Woo Il ;
Composites Research, volume 26, issue 4, 2013, Pages 230~234
DOI : 10.7234/composres.2013.26.4.230
The continuous glass fiber reinforced poly-lactic acid (PLA) composite was manufactured by direct melt impregnation. The mechanical and thermal properties of continuous glass fiber reinforced PLA composite were observed. Measured properties were compared with the reference values of neat PLA and the injection molded glass fiber/ PLA composite. The continuous glass fiber reinforced PLA composite having a fiber volume fraction of 27.7% shows enhanced tensile strength of 331.1 MPa, flexural strength of 528.6 MPa, and flexural modulus of 24.0 GPa. The enhanced heat deflection temperature (HDT) and the increased cystallinity were also observed. The degree of impregnation as a function of pulling speed was also assessed. The degree of impregnation at the pulling speed of 5 m/min was over 90% in this research.
Stress Analysis in Multiple Isotropic Elliptical Fibers of Arbitrary Orientation
Lee, Jung-Ki ; Oh, Sang-Min ;
Composites Research, volume 26, issue 4, 2013, Pages 235~244
DOI : 10.7234/composres.2013.26.4.235
A volume integral equation method (VIEM) is introduced for the solution of elastostatic problems in an unbounded isotropic elastic solid containing multiple isotropic elliptical fibers of arbitrary orientation subject to uniform stress at infinity. The fibers are assumed to be long parallel elliptical cylinders composed of isotropic elastic material perfectly bonded to the isotropic matrix. The solid is assumed to be under plane strain on the plane normal to the cylinders. A detailed analysis of the stress field at the matrix-fiber interface for square and hexagonal packing of the fibers is carried out for different values of the number, orientation angles and concentration of the elliptical fibers. The accuracy and efficiency of the method are examined through comparison with results obtained from analytical and finite element methods.
Development of a Prediction Model for the Mechanical Properties of Polypropylene Composites Reinforced by Talc and Short Glass Fibers
Kim, Soon ; Son, Dongil ; Choi, Donghyuk ; Jeong, Inchan ; Park, Young-Bin ; Kim, Sung Youb ;
Composites Research, volume 26, issue 4, 2013, Pages 245~253
DOI : 10.7234/composres.2013.26.4.245
In this paper, we developed a theoretical model which is able to predict the tensile strength and elastic modulus of hybrid composites reinforced by two types of randomly distributed discontinuous reinforcements. For this, we considered two known models; One is a prediction model based on the assumption that the composite is reinforced by two types of well aligned continuous reinforcements. The other is a statistical model for the composite which is reinforced by only one type of randomly distributed discontinuous reinforcements. In order to evaluate the validity of accuracy of our prediction model, we measured the strength and elastic modulus of polypropylene hybrid composite reinforced by talc and short glass fiber. We found that the present model drastically enhances the accuracy of strength prediction compared to an existing model, and predicts the elastic modulus within the same order with experimentally measured values.
A Study on Processing-Structure-Property Relationships of Extruded Carbon Nanomaterial-Polypropylene Composite Films
Kim, Byeong-Joo ; Deka, Biplab K. ; Kang, Gu-Hyuk ; Hwang, Sang-Ha ; Park, Young-Bin ; Jeong, In-Chan ; Choi, Dong-Hyuk ; Son, Dong-Il ;
Composites Research, volume 26, issue 4, 2013, Pages 254~258
DOI : 10.7234/composres.2013.26.4.254
Polypropylene films reinforced with multi-walled carbon nanotubes and exfoliated graphite nanoplatelets were fabricated by extrusion, and the effects of filler type and take-up speed on the mechanical properties and microstructure of composite films were investigated. Differential scanning calorimetry revealed that the addition of carbon nanomaterials resulted in increased degree of crystallinity. However, increasing the take-up speed reduced the degree of crystallinity, which indicates that tension-induced orientations of polymer chains and carbon nanomaterials and the loss of degree of crystallinity due to rapid cooling at high take-up speeds act as competing mechanisms. These observations were in good agreement with tensile properties, which are governed by the degree of crystallinity, where the C-grade exfoliated graphite nanoplatelet with a surface area of
showed the greatest reinforcing effect among all types of carbon nanomaterials used. Scanning electron microscopy was employed to observe the carbon nanomaterial dispersion and orientation, respectively.
Safety Evaluation of Radiating Element by Structural Test and Stress Analysis
Kim, Jin-Yul ; Kim, Dong-Seob ; Park, Byung-Rak ; Kim, Jin-Sung ; Kim, Min-Sung ; Park, Chan-Yik ; Hwang, Woon-Bong ;
Composites Research, volume 26, issue 4, 2013, Pages 259~264
DOI : 10.7234/composres.2013.26.4.259
This study manufactured the radiating element of multi-band antenna skin structure which satisfy electrical and mechanical performance and is made by double injection molding process. Structural test including impact and buckling test is carried out and stress analysis is simulated to evaluate safety of radiating element for the axial and shear loads, when changing of the skin structure is occurred by the external force. To predict allowable load of structure and evaluate safety on impact and buckling, experimental and analytic method is used in strength analysis of structure.
Experimental Investigation of the Effect of Manufacturing and Working Conditions on the Deformation of Laminated Composite Structures
Nhut, Pham Thanh ; Yum, Young-Jin ;
Composites Research, volume 26, issue 4, 2013, Pages 265~272
DOI : 10.7234/composres.2013.26.4.265
Fiber-reinforced plastic (FRP) is applied to fabricate the main structures of composite boats. Most of them are made from molds. These products deform after releasing from the mold and they also deform in high temperature environment. Therefore, experimental investigation and evaluation of deformation of laminated composite structures under various manufacturing and working conditions are necessary. The specimens of L-shape and curveshape were made from unsaturated polyester resin and fiberglass material. Input factors (independent variables) are percentage of hardener and manufacturing temperature and four levels of working temperature and output factor is the deformation which is measured on these specimens. From the results, it was observed that the higher the hardener rate and temperature, the lower the deformation. When the working temperature increased, the specimens showed great variations for the initial deformation values. Besides, the values of deformation or input factors could be predicted by regression equations.