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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal DOI :
The Korean Society for Composite Materials
Editor in Chief :
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
Evaluation of Mechanical Properties and Damage Sensing of CNT-Polypropylene Composites by Electro-Micromechanical Techniques
Wang, Zuo-Jia ; Kwon, Dong-Jun ; Gu, Ga-Young ; Kim, Hak-Soo ; Kim, Dae-Sik ; Lee, Choon-Soo ; Park, Joung-Man ;
Composites Research, volume 26, issue 1, 2013, Pages 1~6
DOI : 10.7234/kscm.2013.26.1.1
CNT-polypropylene (PP) composites were compounded by solvent dispersion method with uniform dispersion by using twin screw extruder. Damage sensing effects based on conductive carbon nanotubes (CNT) were evaluated to monitor the internal damage of CNT-PP composites using electrical resistance measurement. Mechanical and interfacial properties of CNT-PP composites were investigated and compared with neat PP. The mechanical properties of PP matrix were improved after adding CNT, because of the reinforcing effect of CNT fillers. In order to monitor the internal damage of CNT-PP composite, the change in electrical resistance of the composites was measured under fatigue loading and bending tests. CNT fillers exhibited good sensing under electrical resistance measurements. It is shown that CNT-PP composites with low CNT contents allow identifying critical cyclic loading, which are found to be accompanied with the internal failure.
Finite Element Analysis for the Design of Fiber Reinforced Metal Cylinder
Kim, Tae-Hwan ; Kim, Wie-Dae ; Jeong, Chul-Gon ;
Composites Research, volume 26, issue 1, 2013, Pages 7~13
DOI : 10.7234/kscm.2013.26.1.7
This paper describes the design of dual-structured and thick-walled cylinder made of composites and special steel. The structure of special steel and composites reduce the weight of a product maintaining its property which is proper to the characteristics. Hence they are used in the fields, such as various ground weapons, aerospace and sports industries, where high elasticity and low weight are required. Thus in this study, the analysis was conducted to find the most proper composite application method changing its types and angle of laminates for the design. Through the comparison of the results, we suggest the method for composite application which is the most appropriate to the designing purpose of this study.
Mechanical and Electrical Properties of Electrospun CNT/PVDF Nanofiber for Micro-Actuator
Gu, Ga-Young ; Wang, Zuo-Jia ; Kwon, Dong-Jun ; Park, Joung-Man ;
Composites Research, volume 26, issue 1, 2013, Pages 14~20
DOI : 10.7234/kscm.2013.26.1.14
The electrospun PVDF containing CNT was made for fabricating materials of the actuator. The electrochemical and their actuating movement were evaluated for the actuator performance in the electrochemical environment. The actuator (which was fabricated by electrospinning) had some advantages, i.e., good dispersion and flexible properties. In the electrospinning process, the final product would have different forms based on different essential factors. In this work, electrospun nanofibers were aligned by using the drum-type collector, and the morphology was identified via the field emission-scanning electron microscope (FE-SEM). The uniform dispersion of CNT in PVDF nanofiber was observed by electron probe X-ray micro-analysis (EPMA) test. The results of tensile strength and electrical resistivity provided the aligned state. The electrospun CNT/PVDF nanofiber sheet on the aligned direction showed better mechanical and electrical properties than the case of the vertically-aligned direction. The efficiency and electrical capacities of electrospun CNT/PVDF nanofiber sheets were compared with the cast PVDF sheet for actuator application. Electrospun CNT/PVDF nanofiber sheet exhibited much better the case of actuator performance than cast neat PVDF actuator, due to the excellent electrical connecting areas.
Prediction of Ballistic Limit for Composite Laminates Subjected to High-velocity Impact Using Static Perforation Test
You, Won-Young ; Kim, In-Gul ; Lee, Seokje ; Kim, Jong-Heon ;
Composites Research, volume 26, issue 1, 2013, Pages 21~28
DOI : 10.7234/kscm.2013.26.1.21
The ballistic limit of Carbon/Epoxy composite laminates with the finite effective area are predicted by using the quasi-static perforation test and semi-empirical formula. The perforation energy were calculated from force-displacement curve in quasi-static perforation test. Also, the actual ballistic limit and penetration energy were obtained through the high-velocity impact test. The quasi-static perforation test and high-velocity impact test were conducted for the specimens with 3 different effective areas. In the high-velocity impact test, the air gun impact tester were used, and the ballistic and residual velocity was measured. The required inputs for the semi-empirical formula were determined by the quasi-static perforation tests and high-velocity impact tests. The comparison between semi-empirical formula and high-velocity impact test results were conducted and examined. The ballistic limits predicted by semi-empirical formula were agreed well with high-velocity impact test results.
Advance Probabilistic Design and Reliability-Based Design Optimization for Composite Sandwich Structure
Lee, Seokje ; Kim, In-Gul ; Cho, Wooje ; Shul, Changwon ;
Composites Research, volume 26, issue 1, 2013, Pages 29~35
DOI : 10.7234/kscm.2013.26.1.29
Composite sandwich structure can improve the specific bending stiffness significantly and save the weight nearly 30 percent compared with the composite laminates. However, it has more inherent uncertainties of the material property caused by manufacturing process than metals. Therefore, the reliability-based probabilistic design approach is required. In this paper, the PMS(Probabilistic Margin of Safety) is calculated for the simplified fuselage structure made of composite sandwich to provide the probabilistic reasonable evidence that the classical design method based on the safety factor cannot ensure the structural safety. In this phase, the probability density function estimated by CMCS(Crude Monte-Carlo Simulation) is used. Furthermore, the RBDO(Reliability-Based Design Optimization) under the probabilistic constraint are performed, and the RBDO-MPDF(RBDO by Moving Probability Density Function) is proposed for an efficient computation. The examined results in this paper can be helpful for advanced design techniques to ensure the reliability of structures under the uncertainty and computationally inexpensive RBDO methods.
Study on Impact Damage Behavior of Sandwich Composite Structure for aircraft
Park, Hyunbum ; Kong, Changduk ;
Composites Research, volume 26, issue 1, 2013, Pages 36~41
DOI : 10.7234/kscm.2013.26.1.36
In this study, low velocity impact analysis on composite sandwich structure was performed. Sandwich structure configuration is made of Carbon-Epoxy face sheets and foam cores. For validating study, the results of an experimental and a finite element method analysis were compared previously. From the finite element method analysis results of sandwich panel, it was confirmed that the results of analysis was reasonable. Impactor velocity to initiate damage was estimated, and in order to investigate the damage at the predicted velocity, impact analysis using finite element method was performed. According to the impact analysis results of sandwich panel, it was confirmed that the damage was generated at the estimated impact velocity. Finally, The comparison of the numerical results with those measured by the experiment showed good agreement.
A Study on the Processing Technique to form Various Dimples on the Surface of Composite Parts
Joe, C.R. ; Byun, Gill-Jae ;
Composites Research, volume 26, issue 1, 2013, Pages 42~47
DOI : 10.7234/kscm.2013.26.1.42
In this study, an economical and effective processing technique to form multiple dimples on the surface of a composite part, which are known to be useful to improve aerodynamic performance and heat dissipation. Forming dimples on the surface using molds is an expensive processing because forming multiple tiny positive spheres on the surface of the mold requires much time and effort. In this study, plates with multiple round holes are utilized as a core to form dimples on the carbon/epoxy composite skin covering the core. A vacuum bagging process is used to apply pressure on the surface while curing. Composite parts which have multiple dimples on the surface can be utilized in the field which needs high aerodynamic performance and heat dissipation ability such as high speed sports car bodies.
Studies on Borassus fruit fiber and its composites with Polypropylene
Sudhakara, P. ; Obi Reddy, K. ; Prasad, C. Venkata ; Jagadeesh, Dani. ; Kim, H.S. ; Kim, B.S. ; Bae, S.I. ; Song, J.I. ;
Composites Research, volume 26, issue 1, 2013, Pages 48~53
DOI : 10.7234/kscm.2013.26.1.48
This paper summarizes the structural characterization of borassus fruit fibers by means of various characterization techniques, optimization of alkali treatment of borassus fruit fine fibers (BFF) with a 5% concentration sodium hydroxide solution for different time intervals (1, 4, 8 and 12 h) and the changes occurring in borassus fibers. This paper also discusses the manufacturing of BFF/PP compotes using MAPP as a compatibilizer in addition to alkali treatment. Composites were evaluated for their mechanical and morphological properties. The tensile strength and modulus, flexural strength and modulus and impact strength were increased for alkali treated/MAPP composites by 4.5%, 17%, 17.2 %, 9% and 10% respectively.
Characteristic Studies of Plasma Treated unidirectional Hildegardia Populifolia Fabric
Prasad, C. Venkata ; Lee, D.W. ; Sudhakara, P. ; Jagadeesh, D. ; Kim, B.S. ; Bae, S.I. ; Song, J.I. ;
Composites Research, volume 26, issue 1, 2013, Pages 54~59
DOI : 10.7234/kscm.2013.26.1.54
This study deals with effect of plasma treatment on the properties of unidirectional ligno cellulosic fabric Hildegardia Populofolia (HDP) fabric. Thermal stability of the fabric was determined by differential scanning calorimetry (DSC) and Thermo gravimetric analysis (DSC). Morphological properties was analyzed by SEM analysis and found that the surface was rough upon plasma treatment which provides good interfacial adhesion with matrix during composite fabrication. Thermal stability and mechanical properties of the plasma treated fabric slightly increases compare to alkali and untreated fabric. It was observed that tensile properties of the fabric increases upon plasma treatment due to the formation of rough surface. SEM analysis indicates formation of rough surface on plasma treatment which helps in increasing the interfacial interaction between the matrix (hydrophobic) and fabric (hydrophilic).
Study of Al
(5 nm/20nm) Nanolaminate Composite
Balakrishnan, G. ; Wasy, A. ; Ho, Ha Sun ; Sudhakara, P. ; Bae, S.I. ; Song, J.I. ;
Composites Research, volume 26, issue 1, 2013, Pages 60~65
DOI : 10.7234/kscm.2013.26.1.60
A nanolaminate consisting of alternate layers of aluminium oxide (
) (5 nm) and zirconium oxide (
) (20 nm) was deposited at an optimized oxygen partial pressure of
mbar by pulsed laser deposition. The nanolaminate film was analysed using high temperature X-ray diffraction (HTXRD) to study phase transition and thermal expansion behaviour. The surface morphology was investigated using field emission scanning electron microscopy (FE-SEM). High temperature X-ray diffraction indicated the crystallization temperature of tetragonal zirconia in the
multilayer-film was 873 K. The mean linear thermal expansion coefficient of tetragonal
along a axis, while it was
along c axis in the temperature range 873-1373 K. The alumina was in amorphous nature. The FESEM studies showed the formation of uniform crystallites of zirconia with dense surface.
Compression Behavior of Manufacturability Enhanced FRP-Concrete Hybrid Composite Pile
Lee, Young-Geun ; Park, Joon-Seok ; Kim, Sun-Hee ; Kim, Hong-Lak ; Yoon, Soon-Jong ;
Composites Research, volume 26, issue 1, 2013, Pages 66~71
DOI : 10.7234/kscm.2013.26.1.66
As a fundamental structural element of construction, a pile is constructed to transfer loads from superstructure to foundation. In general, since the pile foundation is constructed in the ground or ground under water, it is difficult to protect from the damages due to moisture and/or salt which create corrosive environment and it is even more difficult to estimate its durability. In this study, in order to enhance the durability and constructibility of the pile foundation, FRP-concrete hybrid composite pile (HCFFT) is suggested. Moreover, equation for the prediction of load carrying capacity of HCFFT circular members under compression is suggested and discussed based on the results of analytical and experimental investigations. In addition, we also conducted the finite element simulation for the structural behavior of new HCFFT composite pile and the result is compared with those of experimental and analytical studies. In addition, the axial loading capacity of new HCFFT composite pile is compared with those of existing PHC pile and hollow circular steel pipe pile, and it was found that the new HCFFT composite pile has advantages over conventional PHC and steel pipe piles.
Experimental and Numerical Study of Heating Characteristics of Discontinuous Carbon Fiber-Epoxy Composites
Kim, Myungsoo ; Kong, Kyungil ; Kim, Nari ; Park, Hyung Wook ; Park, Ounyoung ; Park, Young-Bin ; Jung, Mooyoung ; Lee, Sang Hwan ; Kim, Su Gi ;
Composites Research, volume 26, issue 1, 2013, Pages 72~78
DOI : 10.7234/kscm.2013.26.1.72
This study explores the resistive heating characteristics of discontinuous carbon fiber (CF)-epoxy composites. Test samples including 1, 3, and 5 wt.% CF were fabricated using sonication and cast molding processes. For heating performance characterization, DC currents were applied to the composite samples, and surface temperatures were evaluated visually and quantitatively using an infrared camera. To estimate the thermal performance of composites and verify the experimental results, finite element analyses were performed. The resistive heating mechanism was investigated in connection with CF loading and applied voltages. Resistive heating efficiency increased proportionately with CF concentration and applied voltage. To obtain homogeneous temperature distribution of the samples, high degree of CF dispersion is required.