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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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Manufacturing and Mechanical Properties of Sisal Fiber Reinforced Hybrid Composites
Hui, Zhi-Peng ; Sudhakara, P. ; Wang, Yi-Qi ; Kim, Byung-Sun ; Song, Jung-Il ;
Composites Research, volume 26, issue 5, 2013, Pages 273~278
DOI : 10.7234/composres.2013.26.5.273
PLA/PP polymer blends in various ratios (PLA:PP = 9:1, 4:1, 3:1, and 1:1), and their composites (PLA:PP = 1:1) with sisal fiber (10, 15 and 20 wt%) were fabricated using MAPP as compatibilizer. The aim of the work was to reduce the cost of biodegradable composites as well as to improve the impact strength of PLA using PP, a relatively cheaper thermoplastic. The developed composites were characterized for their morphological and mechanical properties. The tensile strength and modulus of the blends were decreased with increasing PP content whereas the strain at break and impact strength are increased. The tensile strength, modulus and water absorption were increased for hybrid composites with increasing fiber content.
Study on Thermal Residual stresses and Transmission Characteristics in Loop Type Frequency Selective Surface Embedded Composite Structures
Park, Kyoung-Mi ; Hwang, In-Han ; Chun, Heoung-Jae ; Hong, Ic-Pyo ; Park, Yong-Bae ; Kim, Yoon-Jae ;
Composites Research, volume 26, issue 5, 2013, Pages 279~288
DOI : 10.7234/composres.2013.26.5.279
In this paper, the delamination and deformed FSS caused by residual stresses in the Loop type FSS embedded composites and the transmission characteristic changes due to deformation of FSS by residual stresses were studied. FSS may have different electromagnetic characteristics depending on the type of element, design variables, and array. Therefore, design variables of square loop FSS embedded composites structures were determined to obtain the transmission characteristic for X-band (8~12 GHz). Then the design variables of other types of loops (triangular loop and circular loop) were determined based on the dimensions of square loop. Thereafter, the residual stresses and transmission characteristics of FSS embedded composite structures with various single and double loop FSS's, and stacking sequence of composite laminates were compared.
An Experimental Study for Electro-active Polymer Electrode and Actuator
Lee, Jun-Man ; Ryu, Sang-Ryeoul ; Lee, Dong-Joo ; Lin, Zheng-Jie ;
Composites Research, volume 26, issue 5, 2013, Pages 289~294
DOI : 10.7234/composres.2013.26.5.289
A thinner is used to improve the multi-walled carbon nano-tube (CNT) and carbon black (CB) dispersion in a polymer matrix and to make a soft electrode. The electrical and mechanical properties of the soft electrodes are investigated as functions of CNT, CB and thinner content. The optimal mixing condition for the electrode is thinner 80, CNT 3.5, CB 18 (phr) on the basis of matrix (KE-12). The specific resistance of that is 73 (
), and tensile strength, tensile modulus, and elongation of that is 0.45 MPa, 0.21 MPa, and 184%, respectively. Also, a simple structure of the actuator with an optimized electrode and elastomer is fabricated and its characteristic is evaluated. At the operating voltage 25 kV, the displacement of an elastomer KE-12 is 2.24 mm, and that of an elastomer KE-12 with thinner 50 (phr) is 4.05 mm. It shows a higher displacement compared to that of 3M 4910 which has similar modulus. The actuator made with elastomer and electrode of the same material (KE-12) may have advantages for fatigue life and application.
Effect of Surface Roughness of Al5052/CFRP Composites on the Adhesion and Mechanical Properties
Lee, Min-Sik ; Kim, Hyun-Ho ; Kang, Chung-Gil ;
Composites Research, volume 26, issue 5, 2013, Pages 295~302
DOI : 10.7234/composres.2013.26.5.295
In this study, Al5052/CFRP composites were fabricated for an automobile component by compression molding process inside a U-channel mold. Al5052 sheet were treated by sand blasting with two different particle sizes. Accordingly, surface roughness (Ra) values of
were obtained for the treated Al5052 sheets. The effect of surface roughness of Al5052 sheets on the adhesion and mechanical properties of Al5052/CFRP composites have been evaluated. Shear lap test and 3-point bending test were conducted. Results showed that the shear load for the composite fabricated by using the treated Al5052 sheets with Ra value of
were 3 and 5 times higher than Ra value of
of the composite fabricated by using the untreated sheet. The bending stress of 200MPa was obtained for the composite fabricated with untreated Al5052 sheets. The bending stress increased to 400MPa when the composite fabricated from treated sheets. However, the bending stress was not influenced by treating condition through sand blasting.
Investigation of Mechanical Property of Polypropylene and CF/PP Composites with Number of Recycle
Kwon, Dong-Jun ; Wang, Zuo-Jia ; Lea, Tea-Ung ; Park, Joung-Man ;
Composites Research, volume 26, issue 5, 2013, Pages 303~308
DOI : 10.7234/composres.2013.26.5.303
Carbon fiber (CF) reinforced polypropylene (PP) compositeis was increased to amount consumed. In this study, recycle of composites by recycle times. CF was containing 20%. Mechanical and interfacial propertis of CF/PP was evaluation for number of recycle time. Mechanical assessment of CF/PP was tension, bending, fatigue tension test and izod test method. Interfacial assessment of CF/PP was wettability test and FE-SEM of fracture surface method. Fiber and matrix was changed to recycle time. The more recycle of CF/PP, the more interfacial bonding was decreased. Because fiber and matrix was damaged to thermal damage. And then reinforced CF was shorter than original shape.
Microstructure and Ablation Performance of CNT-phenolic Nanocomposites
Wang, Zuo-Jia ; Kwon, Dong-Jun ; Park, Jong-Kyoo ; Lee, Woo-Il ; Park, Joung-Man ;
Composites Research, volume 26, issue 5, 2013, Pages 309~314
DOI : 10.7234/composres.2013.26.5.309
Highly ablation resistant carbon nanotube (CNT)-phenolic composites were fabricated by the addition of low concentrations of CNT nanofiller. Tensile and compressive properties as well as ablative resistance were significantly improved by the addition of only 0.1 and 0.3 wt% of uniformly dispersed CNTs. An oxygen-kerosene-flame torch and a field emission scanning electron microscope (FE-SEM) were used to evaluate the ablative properties and microstructures of these CNT-phenolic composites. Thermal gravimetric analysis (TGA) revealed that the ablation rate was lower for the 0.3 wt% CNT-phenolic composites than for neat phenolic or the composite with 0.1 wt% CNT. Ablative mechanisms for all three materials were investigated using this TGA in conjunction with microstructural studies using a FE-SEM. The microstructural studies revealed that CNT acted as an ablation resistant phase at high temperatures, and that the uniformity of dispersion of the CNT played an important role in this resistance to ablation.
Carbonization of Pitch-coated Glass Fibers on Thermal Conductivity of Epoxy Composites
Beom, Seung-Won ; Lee, Seul-Yi ; Lee, Ji-Han ; Park, Sang Hee ; Park, Soo-Jin ;
Composites Research, volume 26, issue 5, 2013, Pages 315~321
DOI : 10.7234/composres.2013.26.5.315
In this work, pitch-carbonized glass fibers were prepared for reinforcement of composites. The influence of acid functionalization of the fibers on the morphological, mechanical, and thermal properties of fiber-reinforced epoxy matrix composites was investigated. The acid functionalization of the fibers led to 10 and 150% increases in the mechanical and thermal properties, respectively, as compared to carbon fiber-reinforced composites. This can be attributed to the superior orientation of fiber structures and good interfacial interactions between fillers and epoxy matrix, resulting in enhanced degree of dispersion and formation of thermally conductive paths in the functionalized composites.
Densification of C
/SiC Composite Using PIP with Adding of Cyclohexene
Bae, Jin-Cheol ; Cho, Kwang-Youn ; Kim, Jun-Il ; Im, Dong-Won ; Park, Jong-Kyu ; Lee, Man-Young ; Lee, Jae-Yeol ;
Composites Research, volume 26, issue 5, 2013, Pages 322~327
DOI : 10.7234/composres.2013.26.5.322
Carbon fiber-reinforced SiC matrix composites have good oxidation resistance and thermal shock resistance. These properties have allowed the composites to be applied to high-temperature structures. In this study,
composites were fabricated via precursor infiltration and pyrolysis (PIP) process, including liquid phase infiltration and chemical vapor curing using cyclohexene. The final
composites, which have gone through the PIP process five times, showed a density of
, as compared to a density of
for pre-densified bare carbon fiber preform. As for the oxidation resistance characteristics, the weight of
composite was maintained at 81% at
in air for 6 hours. Chemical vapor curing (CVC) using cyclohexene has shown to be an effective method to achieve high densification, leading to increased oxidation resistance.
Fatigue Characterization of Glass/Polypropylene Composite Bone Plates Locked with an Artificial Tibia under Moisture Environment
Han, Min-Gu ; Chang, Seung-Hwan ;
Composites Research, volume 26, issue 5, 2013, Pages 328~333
DOI : 10.7234/composres.2013.26.5.328
In this study, bone plate made of glass/polypropylene composite material which was applied to an artificial bone was tested to check the service ability under fatigue loading. To check serviceability of composite bone plates fatigue test was carried out considering changes in the moisture absorption rate, locking position of screws and loading condition. Test results showed that all the tested specimens had the fatigue life more than one million cycles which was much higher fatigue life than the expected value of 650,000 cycles. Screw position was not critical impact on the deformation of the fracture site. In this paper, the mechanical performance of the glass/polypropylene composite was verified by fatigue test under various water absorption conditions, and this result may give useful information on the design of composite bone plate.