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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 25, Issue 6 - Dec 2012
Volume 25, Issue 5 - Oct 2012
Volume 25, Issue 4 - Aug 2012
Volume 25, Issue 3 - Jun 2012
Volume 25, Issue 2 - Apr 2012
Volume 25, Issue 1 - Feb 2012
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A Study on the Mechanical Properties and Specific Resistivity of Reaction-Bonded Silicon Carbide According to α-SiC of Various Mixed Particle Size
Kim, Young-Ju ; Park, Young-Shik ; Jung, Youn-Woong ; Song, Jun-Baek ; Park, So-Young ; Im, Hang-Joon ;
Composites Research, volume 25, issue 6, 2012, Pages 172~177
DOI : 10.7234/kscm.2012.25.6.172
For the manufacture of low resistance Si-SiC composite, the properties of reaction sintering in the green body of various mixed
-SiC powder size with the various carbon contents from 0wt% to 20wt% were investigated. The samples preparation was green body by CIP method under this condition, molten silicon infiltration process was conducted to reaction bonded silicon carbide. the results of sintered density, 3-point bending strength and resistance of analysis showed that varied carbon and silicon melt reacted to convert to fine
-SiC particle and the structure was changed to dense material. The amount of fine
-SiC particle was gradually increased as carbon content increase. According to mixed composite, it's mechanical and specific resistivity properties was strongly influenced by carbon content within 10wt% more then carbon content 10wt% was strongly influenced by phase transition.
Manufacturing Functional Nano-Composites by Using Field-Aided Micro-Tailoring Manipulation
Cho, Hee-Keun ; Rhee, Juhun ; Sim, Eun-Sup ;
Composites Research, volume 25, issue 6, 2012, Pages 178~185
DOI : 10.7234/kscm.2012.25.6.178
One of a unique technique in manipulating a multifunctional composite is demonstrated in this study. An electric field is applied to a liquid suspension in order to align the inclusions along with the direction electric field. This is called FAiMTa(Field Aided Micro Tailoring). It makes orthotropic polymer composites by arranging the micro and/or nano size particle inclusions in chain-line formation. Several kinds of particles such as
, graphite, CNT(Carbon Nano Tube), W(Tungsten) are tested to verify the effectiveness of the FAiMTa. The particles redistributed in an epoxy suspension and their coupons show that mechanical and thermal properties of orthotropic and random composites containing those particles depend on the trend of particles' alignment. The micro-images of the functional composite from FAiMTa have been captures and their physical properties demonstrate their wide-range and state-of-the-art application for advanced multifunctional composites.
A Study on the strength of the Bolted Joint & Pin Joint with Hole Clearance
Jeong, Kang-Woo ; Choi, Jin-Ho ; Kweon, Jin-Hwe ;
Composites Research, volume 25, issue 6, 2012, Pages 186~190
DOI : 10.7234/kscm.2012.25.6.186
With the wide application of fiber-reinforced composite material in aero-structures and mechanical parts, composite joint have become a very important research area because they are often the weakest sites in composite structures. In this paper, the failure strengths of the bolted joint and pin joint which have variable hole clearance were evaluated and compared. From the tests, the first failure loads of the bolted joint and pin joint with
hole clearance have decreased by 24.2 % and 51.3 % compared to those of joints with
hole clearance, respectively. Also, the failure index of the joints were calculated by the finite element method and compared with experimental results.
High velocity Impact Analysis of Carbon/Epoxy Composite Laminates
Kim, Young-Ah ; Woo, Kyeongsik ; Yoo, Won-Young ; Kim, In-Gul ; Kim, Jong-Heon ;
Composites Research, volume 25, issue 6, 2012, Pages 191~197
DOI : 10.7234/kscm.2012.25.6.191
In this paper, the penetration behavior of carbon/epoxy composite laminates subjected to high velocity projectile impact was studied by numerical simulation. The composite laminates made of carbon/epoxy with
stacking sequence and the spherical steel impactor were three-dimensionally modeled. The ply numbers of 16 and 24 and the impact velocities in the range of 140-250 m/s were considered. The analysis was performed using an explicit finite element code LS-DYNA. The residual velocity and the amount of damage were predicted and compared to the experimental results.
Mechanical Properties of VARTM Processed Abaca Fabric Composites
Byun, Gill Jae ; Ha, Jong-Rok ; Kim, Byung-Sun ; Joe, Chee Ryong ; Ok, Ju Seon ;
Composites Research, volume 25, issue 6, 2012, Pages 198~204
DOI : 10.7234/kscm.2012.25.6.198
The objective of this study is to improve the mechanical properties in abaca fabric/epoxy composites produced using a VARTM process. The mechanical properties were improved by increasing the surface roughness of the fabric through plasma polymerization and improving the interfacial adhesion between the epoxy and the fabric through changing its hydrophilic properties to the hydrophobic properties. Plasma polymerization at atmospheric pressure and room temperature was used, and the optimal polymerization time to improve the mechanical properties was investigated. NaOH treatment on the fabric was also carried out for the comparison. The composite fabricated using the fabric polymerized for 10 seconds shows the highest tensile strength compared to that of none-polymerized or NaOH treated. Plasma polymerization for more than 20 seconds exhibits decrease in the tensile strength. As a result, the plasma polymerization for more than 20 seconds may have caused some damages on the surface of the fabrics. Also, the hydrophilic abaca represents a tendency of presenting the hydrophobic properties in absorption and sedimentation tests.
Measurement of Electrical Resistance Method in Characterizing the Slip ratio of Carbon fiber/Matrix at the Interface
Kwon, Dong-Jun ; Wang, Zuo-Jia ; Gu, Ga-Young ; Park, Joung-Man ;
Composites Research, volume 25, issue 6, 2012, Pages 205~210
DOI : 10.7234/kscm.2012.25.6.205
The single carbon fiber tensile test was performed with electrical resistance measurement. Tensile property of single carbon fiber which accompanied by the relationship between the electric resistance and the strain was investigated. Since the collected data showed a linear relationship between them, the coefficient of fiber slip ratio (FSR) was obtained by computation. The fragmentation specimen (FS) was tested under tensile loading, and the single carbon fiber broke first due to the stress transferring form matrix to reinforcing fiber. The stress distribution of carbon fiber could be observed via the electrical resistance change. Slipping between carbon fiber and matrix was predicted based on the fragmentation test results, and the FSR was used to evaluate interfacial adhesion comparatively. The large FSR indicated poor interfacial bonding. Work of adhesion between carbon fiber and matrix was measured to verify the FSR method, and two results exhibited a consistent conclusion.
Fixation Method of Prestressed Fiber Optic Sensor
Kim, Ki-Soo ;
Composites Research, volume 25, issue 6, 2012, Pages 211~216
DOI : 10.7234/kscm.2012.25.6.211
FBG sensor peaks could be split due to polarization by shear strain, when the fiber optic sensors embedded or attached to the structure. For the fiber optic sensor packages, sensor grating has to be protected from shear strains. Also, pretension has to be applied to the sensor because compressive strain must be measured. Without pretension of sensor, the sensor does not show any change of signal until it is stretched. In order to mesure compressive and tensile strains, two fixing point and prestressed sensor need. In the fixing point, just holding the optical fiber cause slip between core and cladding in the fiber. A Fixation method of prestressed FBG sensors fixed with partially stripped fibers was developed. The sensor package has the prestress controllable fixtures at the fixing points. Prestress to the sensor imposed by controlling the two fixed points with bolts and nuts make it easy to measure compressive strain as well as tensile strain. The fiber optic sensor packages applied to the actual structure and the structural monitoring system using the package can be applied to safety through surveillance.
Parametric effects on geometrical nonlinear dynamic behaviors of laminated composite skew plates
Lee, Sang-Youl ;
Composites Research, volume 25, issue 6, 2012, Pages 217~223
DOI : 10.7234/kscm.2012.25.6.217
This study investigates a geometrical nonlinear dynamic behaviors of laminated skew plates made of advanced composite materials (ACM). Based on the first-order shear deformation plate theory (FSDT), the Newmark method and Newton-Raphson iteration are used for the nonlinear dynamic solution. The effects of cutout sizes, skew angles and lay up sequences on the nonlinear dynamic response for various parameters are studied using a nonlinear dynamic finite element program developed for this study. The several numerical results were in good agreement with those reported by other investigators for square composite plates with or without central cutouts, and the new results reported in this paper show the significant interactions between the cutout, skew angles and layup sequence in the laminate. Key observation points are discussed and a brief design guideline of skew laminates is given.
Optimal Design of the Composite Hat-shaped Stiffeners for Simplified Wing Box with Embedded Array Antenna
Park, Sunghyun ; Kim, In-Gul ; Lee, Seokje ; Jun, Oo-Chul ;
Composites Research, volume 25, issue 6, 2012, Pages 224~229
DOI : 10.7234/kscm.2012.25.6.224
The structural performance is degraded in case of embedding the array antenna for reconnaissance and surveillance into the wing skin structures. In this paper, the optimal design for the thickness of composite hat-shaped stiffener which is reinforced embedded array antenna on the simplified composite wing box was conducted. To select the basic shape of hat-shaped stiffener, structural analysis was carry out using the commercial finite element analysis program while changing the web slope and flange length of hat-shaped stiffener. The optimal thickness of the composite hat-shaped stiffeners was determined by using commercial optimization program such as VisualDOC and commercial FEA program with considering stresses and buckling constraints.
A Study on the Vibration Analysis and Optimization for the Composite Optical Structure of an Aircraft
Kim, Byeong-Jun ; Lee, Jun-Ho ; Lee, Haeng-Bok ; Jung, Dae-Yoon ; Cheon, Seong-Sik ;
Composites Research, volume 25, issue 6, 2012, Pages 230~235
DOI : 10.7234/kscm.2012.25.6.230
This paper presents the vibration characteristics and the optimization using the orthogonal array about applied composite optical structure of an aircraft. To acquire the vibration characteristics for stable line of sight, modal analysis are performed by using multi-body program ADAMS. And to optimize optical structure, for design variables were selected, larger-the-better characteristics were considered using results of S/N ratio and orthogonal array
. When bearing constraints are selected, radial, axial and moment stiffness value are used to analysis for optimization until now. But B.S.R which is non-dimensional parameter is proposed, structures including bearings can be used for optimization. And then having a result of lager-the-better, the optimized values of each design variable were successfully suggested.
Evaluation of Delamination of Dental Composite Restoration using Infrared Lock-in Thermography
Gu, Ja-Uk ; Choi, Nak-Sam ;
Composites Research, volume 25, issue 6, 2012, Pages 236~240
DOI : 10.7234/kscm.2012.25.6.236
The purpose of this study was to investigate the feasibility on the detection of dental composite delamination using a lock-in thermography method. Amplitude and phase images of detected thermal signals were analyzed according to the lock-in frequencies. At a lock-in frequency of 0.05 Hz, the ligament thickness of 0.5 mm in the specimen exhibited the highest amplitude contrast between defective area and sound area. For ligament thicknesses of 1 mm and 1.5 mm, delamination detection was possible at 0.025 Hz and 0.01 Hz through the amplitude differences. At lock-in frequencies of 0.006 Hz and 0.01 Hz, ligament thickness 0.5 mm exhibited the highest phase contrast. For ligament thicknesses of 1 mm and 1.5 mm, the phase contrast exhibited possible detection of delamination at 0.006-0.1 Hz.