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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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Basic Study on P(VDF-TrFE) Smart Sensor for Monitoring Composite Structure Behaviors
Bae, Ji-Hun ; Chang, Seung-Hwan ;
Composites Research, volume 28, issue 3, 2015, Pages 75~80
DOI : 10.7234/composres.2015.28.3.075
Poly(vinylidene fluoride-trifluoroethylene; P(VDF-TrFE)) is one of the most promising electroactive polymers with numerous application potentials in many fields of industry. Because of its good electro-mechanical properties P(VDF-TrFE) has been used for a number of sensors and actuators and also can be used for monitoring composite structure behaviors as a sensor. Three different ways (Electrical poling, annealing-cooling, and pressing) to enhance
-phase of P(VDF-TrFE) film were carried out. A microscopic analysis was conducted using X-ray diffraction to investigate the effect of such treatments on piezoelectric properties of P(VDF-TrFE) film. From the results, poling, annealing-cooling, and pressing were all effective to enhance
crystallinity of P(VDF-TrFE) film and the maximum increase rate was 62.80% from 45.29% of the control group.
A Development of the Lightweight Wearable Robot with Carbon Fiber Composite
Lee, Jeayoul ; Jeon, Kwangwoo ; Choi, Jeayeon ; Chung, Goobong ; Suh, Jinho ; Choi, Ilseob ; Shin, Kwangbok ;
Composites Research, volume 28, issue 3, 2015, Pages 81~88
DOI : 10.7234/composres.2015.28.3.081
In this paper, we evaluate structural integrity of the wearable robot by using finite element analysis, which is made of CFRP(Carbon Fiber Reinforced Plastic) composite materials to be lightened. On the basis of the ASTM(American Standard Test Method), mechanical tests of the material are carried out in tensile, compressive and shear test for analytical evaluation. With the tested composite material, the main frame and two femoral frames of the robot is redesigned to satisfy the lightening design requirements. It is verified with the structural analysis that the redesigned frames are good for the part of the wearable robot.
A Simulation Study on the Stress Distribution of the Transplanting Part of Artificial Knee Joint due to Elastic Modulus
Lee, J.H. ; Hwang, G.W. ; Cho, J.U. ; Cheon, Seong S. ;
Composites Research, volume 28, issue 3, 2015, Pages 89~93
DOI : 10.7234/composres.2015.28.3.089
This study analyzes the transplanting parts used as the graft of artificial knee joint. The low elastic titanium alloy is applied to clear up the stress shield effect. The simulation analysis is carried about the stress distribution of the transplanting parts. The correlation with frame is inferred and investigated through the equivalent stress distribution of titanium alloy due to elastic modulus. The stress of the transplanting parts decreases as the elastic modulus decreases at the first time. It decreases greatly near the stress of 46 GPa and increases again. Because the stress happened at the transplanting parts decreases, more stress is applied on the frame. This phenomenon is the stress shield effect. The result of this study can be thought to be necessary to develop the safe design of composite material.
Interlaminar Shear Strength of Carbon Fiber Epoxy Composite with Nickel Film
Lee, Min-Kyung ;
Composites Research, volume 28, issue 3, 2015, Pages 94~98
DOI : 10.7234/composres.2015.28.3.094
This paper reports the effects of nickel film interleaves on the interlaminar shear strength(ILSS) of carbon fiber reinforced epoxy composites(CFRPs). A nickel thin film was deposited onto the prepreg by radio frequency(RF) sputtering at room temperature. The ILSS of the nickel film interleaved hybrid composites was increased compared to that of the composites without interleaves. To understand the mechanism of enhancement of the ILSS, the fracture surface of the tested specimens was examined by scanning electron microscopy(SEM). The metal interleaves were acted as a reinforcement for the matrix rich interface and the shear property of their composites improved by enhancing the resistance to matrix cracking.
The Change of Degree of Cure and Specific Heat Capacity According to Temperature of Thermoset Resin
Shin, Dong-Woo ; Hwang, Seong-Soon ; Lee, Ho-Sung ; Kim, Jin-Won ; Choi, Won-Jong ;
Composites Research, volume 28, issue 3, 2015, Pages 99~103
DOI : 10.7234/composres.2015.28.3.099
This paper presents the cure kinetics studies on the cure reaction of thermosetting resin. Above all, change in degree of cure and specific heat capacity according to temperature are observed using DSC and MDSC. The results are analyzed by cure kinetics and specific heat capacity model. Glass transition temperature was also measured to apply to the specific heat capacity model. Model parameters were gained from the modeling result. As a result, behavior of specific heat capacity can be calculated mathematically.
A Study on Design of 500W Class High Efficiency Horizontal Axis Wind Turbine System(HAWTS) Blade Using Natural Fiber Composites
Park, Gwanglim ; Kong, Changduk ; Lee, Haseung ; Park, Hyunbum ;
Composites Research, volume 28, issue 3, 2015, Pages 104~111
DOI : 10.7234/composres.2015.28.3.104
In this work, a structural design on 500W class horizontal axis wind turbine blade using natural-fibre composite is performed. The structural design result of flax composite blade is compared with the result of glass composite blade. The structural design of the wind turbine blade is carried out using the simplified methods such as the netting rule and the rule of mixture. The structural safety of the designed blade structure is investigated through the various load cases, stress, deformation and buckling analyses using the commercial FEM. The structural test of the manufactured prototype blade was performed to confirm the structural analysis results including strains, natural frequencies and deformations. According to the comparison results, it was confirmed that the analysis results are well agreed with the experimental results.
Effects of Manufacturing Technology on the Mechanical Properties of Alfa Fiber Non-woven Reinforced PMMA Composites
Wanassi, Bechir ; Jaouadi, Mounir ; Hassan, Mohamed Ben ; Msahli, Slah ;
Composites Research, volume 28, issue 3, 2015, Pages 112~117
DOI : 10.7234/composres.2015.28.3.112
Mechanical properties of nonwoven alfa fiber based reinforced biocomposite were evaluated to assess the possibility of using it as a new material in engineering applications such as orthopedic application. Samples were fabricated by needle punching, thermal bonding and Hydroentanglement, by blending alfa fibers with wool fibers or Polypropylene fibers. The mechanical properties were tested and showed that the nonwoven NW3 (alfa fiber/PP/PLA, with hydroentanglement) is the best. It has a value of stress at break of 1.94 MPa, a strain of 54.2% and a young's module of 7.95 MPa, in a production normal direction. A biocomposite has been made with NW3 mixed with PMMA matrix. The use of nonwoven based alfa fiber in reinforcing the composite material increases its rigidity and the tensile strength; the elongation was found to be 1.53%, the Young's Module of 1.79 GPa and the tensile at break of 15.06 MPa. Results indicated that alfa fibres are of interest for low-cost engineering applications and can compete with glass fibres in orthopedic application.
Thermal and Mechanical Properties of Waste Ground Nut-shell Reinforced Polyester Composites
Prabhakar, M.N. ; Shah, Atta ur rehman ; Song, Jung-Il ;
Composites Research, volume 28, issue 3, 2015, Pages 118~123
DOI : 10.7234/composres.2015.28.3.118
In the current study explain about the bio-based composites made by groundnut shell as reinforcement with polyester resin matrix. Groundnut shell is an abundantly available natural waste byproduct and poly ester resin is widely used to fabricate of composites for good balance of mechanical properties because it is relatively low price and ease of handling. Evaluate the mechanical properties of manufactured groundnut shell/polyester composites by varying the amounts (wt %) of groundnut shell. Particulate shell reinforced polyester composites incorporating varying amounts of groundnut shell (5, 10, 15 and 20%) were characterized for their tensile strength, flexural strength, and impact strength. The mechanical properties improved with increasing particle loading up to 15% and decreased thereafter. Increasing in strength with increased particle shell loading was attributed to increase in surface area which enhanced load transfer between the polyester matrix and ground shall particulates. Scanning electron microscopic studies have been carried out to study the morphology of the composite. Thermal studies and water absorption properties of the composites also studied in this paper.
Fabrication and Evaluation of Wear Properties of CF/GNP Composites
Kim, S.J. ; Park, S.B. ; Huh, C.H. ; Song, J.I. ;
Composites Research, volume 28, issue 3, 2015, Pages 124~129
DOI : 10.7234/composres.2015.28.3.124
CNT and GNP have several excellent mechanical properties including, high strength, Young's modulus, thermal conductivity, corrosion resistance, electronic shielding and so on. In this study, CF/CNT, GNP/epoxy composites were manufactured by varying the CNT weight ratio at 2wt% and 3wt%, GNP weight ratio at 0.5wt% and 1 wt%. The composites were manufactured by mechanical method (3-roll-mill). Tensile, impact and wear tests were performed according to ASTM standards D638, D256 and D3181 respectively. The results showed that, CF/GNP0.5 wt%/epoxy composites gave good mechanical property in all composites, e.g., tensile strength, impact and were resistance.
Characteristics of Silane Treated Graphene Filled Nanocomposites Exposed to Low Earth Orbit Space Environment
Noh, Jae-Young ; Jin, Seung-Bo ; Kim, Chun-Gon ;
Composites Research, volume 28, issue 3, 2015, Pages 130~135
DOI : 10.7234/composres.2015.28.3.130
This study investigates the property of graphene filled polymer nanocomposites in LEO(Low Earth orbit) environment conditions. In order to improve compatibility with polymer matrices and resistance of carbon material against AO(Atomic oxygen) attack, silanization of graphene oxide with organosilane was carried out. The corresponding moieties were characterized through X-ray photoelectron spectroscopy (XPS). Graphene oxide filled nanocomposites were prepared using solution based processing methods. The sets of specimen series were tested in an accelerated LEO simulated space environment facility. Graphene oxide and silane treated graphene oxide reinforced nanocomposites were compared with neat epoxy. The comparison revealed that the silane treated graphene filled polymer composite shows inherent resistance against atomic oxygen attack while the lack of silane treatment resulted in a reduction in performance.
Stitching Effect on Flexural and Interlaminar Properties of MWK Textile Composites
Byun, Joon-Hyung ; Wang, Yi-Qi ; Um, Moon-Kwang ; Lee, Sang-Kwan ; Song, Jung-Il ; Kim, Byung-Sun ;
Composites Research, volume 28, issue 3, 2015, Pages 136~141
DOI : 10.7234/composres.2015.28.3.136
The stitching process has been widely utilized for the improvement of through-thickness property of the conventional laminated composites. This paper reports the effects of stitching on the flexural and interlaminar shear properties of multi-axial warp knitted (MWK) composites in order to identify the mechanical property improvements. In order to minimize the geometric uncertainties associated with the stacking pattern of fabrics, the regular lay-up was considered in the examination of the stitching effect. The key parameters are as follows: the stitch spacings, the stitching types, the stitching location, and the location of compression fixture nose. These parameters have little effect on the flexural and interlaminar shear properties, except for the case of stitching location. However, the geometry variations caused by the stitching resulted in minor changes to the mechanical properties consistently. Stitching on the
fibers showed the lowest flexural strength and modulus (12% reduction for both properties). The stitch spacing of 5 mm resulted in 8% reduction for the case of interlaminar strength compared with that of 10 mm spacing.