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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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Prediction Method of Dispersion Condition for Reinforced Epoxy in Nano SiC Particles Using Capacitance Measurement
Kwon, Dong-Jun ; Wang, Zuo-Jia ; Kim, Je-Jun ; Jang, Key-Wook ; Park, Joung-Man ;
Composites Research, volume 26, issue 6, 2013, Pages 337~342
DOI : 10.7234/composres.2013.26.6.337
The good dispersion of nano-materials in epoxy matrix was important parameter for the reinforcement effect, and the evaluation of dispersion degree was to prove it. This work was studied to predict the dispersion condition of nano-SiC powders in SiC/epoxy composites using capacitance measurement. Capacitance was defined to be the electric capacity in proportional to electron charge of the measuring section. In case of nano-SiC powders, the electron charge of SiC/epoxy composites was higher than that of neat epoxy resin. Capacitance was evaluated for each section of SiC/epoxy composites. The prediction of dispersion condition was verified by using capacitance measurement. Dispersion condition of nano-SiC powders in epoxy matrix was evaluated with two different dispersion methods, i.e., sonication and stirring methods. The dispersion degree was also verified with the tensile strength correlating to capacitance.
Experimental Study for the Impact Characteristics of Expanded EPP/EPS Foams
Kim, Han-Kook ; Kim, Byeoung-Jun ; Jeong, Kwang-Young ; Cheon, Seong S. ;
Composites Research, volume 26, issue 6, 2013, Pages 343~348
DOI : 10.7234/composres.2013.26.6.343
In the present study, quasi-static tests and impact tests were performed for investigating the mechanical behaviour of EPP (Expanded polypropylene) and EPS (Expanded polystyrene). Four different density cylindrical type specimens were prepared for EPP and EPS and 0.001
of strain rate conditions for quasi-static tests and 100 J, 200 J and 300 J of incident energy conditions for the instrumented impact tests were considered.
The Absorbed Energy of Carbon/Epoxy Composite Laminates Subjected to High-velocity impact in Considering the Loss of Projectile Mass
Cho, Hyun-Jun ; Kim, In-Gul ; Lee, Seokje ; Kim, Young-A ; Woo, Kyeongsik ;
Composites Research, volume 26, issue 6, 2013, Pages 349~354
DOI : 10.7234/composres.2013.26.6.349
In this paper, we conducted high velocity impact test for Carbon/Epoxy composite laminates and proposed advanced method for predicting the absorbed energy of composite laminates. During high-velocity impact test, we discovered loss of projectile mass macroscopically using high speed camera, thus we calculated the absorbed energy of composite laminates by taking loss of projectile mass into account. We proposed a model for predicting the absorbed energy of composite laminates subjected to high-velocity impact, the absorbed energy was classified into static energy and dynamic energy. The static energy was calculated by the quasi-static perforation equation that is related to the fiber breakage and static elastic energy. The dynamic energy can be divided by the kinetic energy of deformed specimen and fragment mass. Finally, the predicted absorbed energy considering loss of projectile mass was compared with experimental results.
Nano-Composite`s Mechanical and Radioactive Barrier Characteristics by Nano Size CNT ＆ Graphite Particles Alignment
Cho, Hee-Keun ;
Composites Research, volume 26, issue 6, 2013, Pages 355~362
DOI : 10.7234/composres.2013.26.6.355
Carbon particle based nanocomposites have been studied. Nanocomposites containing CNT and graphite particles were manipulated by aligning the micro/nano-size particles with electric field. Electric field is applied to the suspension of epoxy matrix and particulate inclusions in order to align them along the direction of the electric field. Particles aligned in a uniform direction act as a fiber in a CFRP composite. The mechanical strength and physical characteristics highly depend on particles` distribution pattern and amount. In this study, the characteristics of radioactive barrier are emphasized, which has been rarely discussed in the literature. A number of sample coupons were tested to verify their performance. The procedure of manufacturing nanocomposites by means of extremely small size particle alignment is presented in sequence. Several physical and structural performances of composites containing aligned and randomly distributed particles were compared. The results show particle alignment is very effective to enhance directional strength and radioactive barrier performance.
Analysis of RTM Process Using the Extended Finite Element Method
Jung, Yeonhee ; Kim, Seung Jo ; Han, Woo-Suck ;
Composites Research, volume 26, issue 6, 2013, Pages 363~372
DOI : 10.7234/composres.2013.26.6.363
Numerical simulation for Resin Transfer Molding manufacturing process is attempted by using the eXtended Finite Element Method (XFEM) combined with the level set method. XFEM allows to obtaining a good numerical precision of the pressure near the resin flow front, where its gradient is discontinuous. The enriched shape functions of XFEM are derived by using the level set values so as to correctly describe the interpolation with the resin flow front. In addition, the level set method is used to transport the resin flow front at each time step during the mold filling. The level set values are calculated by an implicit characteristic Galerkin FEM. The multi-frontal solver of IPSAP is adopted to solve the system. This work is validated by comparing the obtained results with analytic solutions. Moreover, a localization method of XFEM and level set method is proposed to increase the computing efficiency. The computation domain is reduced to the small region near the resin flow front. Therefore, the total computing time is strongly reduced by it. The efficiency test is made with a simple channel flow model. Several application examples are analyzed to demonstrate ability of this method.
A Study on the Sinterning of the Carbon Nanotube/Metal Composites for the Heat Transfer Enhancement
Zheng, XiRu ; Kim, Min Soo ; Park, Chan Woo ;
Composites Research, volume 26, issue 6, 2013, Pages 373~379
DOI : 10.7234/composres.2013.26.6.373
The coating of metal surface with carbon nanotubes (CNTs) has been studied for the heat transfer enhancement of the boiling and condensation of refrigerant. The MWCNT/copper composite powder was made by the attrition ball milling, which has been coated on the copper wafer by electrostatic powder coating and sintered with electric furnace. In this paper, experiments were performed to assess the characterization and comparison of CNT before and after sinterning and the morphology changes of the CNT/Cu-coated surface. The samples were examined by the scanning electron microscope (SEM), energy-dispersive X-ray spectroscopy (EDAX) and raman spectroscopy. To verify the heat transfer enhancement, boiling heat transfer tests were performed.
Characteristics of Delamination Factor and Surface Roughness by Drilling Condition for Glass Fiber Reinforced Plastic Composites
Lee, Ok-Kyu ; Ahn, Dae-Keon ; Choi, Jin-Ho ; Kweon, Jin-Hwe ;
Composites Research, volume 26, issue 6, 2013, Pages 380~385
DOI : 10.7234/composres.2013.26.6.380
Characteristics of delamination factor and surface roughness by drilling condition for glass fiber reinforced plastic (GFRP) composites were investigated in this paper. An expression to quantify the delamination factor was induced by using image pixels of the entry and the experimental drilling was accomplished by fabricating several GFRP specimens in condition of minimizing the effect of vibration and heat. A method for measuring 6 points average surface roughness was applied to acquire the more reliable roughness values. The experimental results showed that the delamination factor was decreased as the feed rate was increased and it was also slightly decreased as the cutting speed was increased. Also, it was investigated that the surface roughness at inner surface of drilled holes was increased as the feed rate was increased, whereas the roughness values were not affected by the cutting speed variation.
Design and Performance Evaluation of Carbon Fiber/Epoxy Composite-aluminum Hybrid Wheel for Passenger Cars
Hong, Jin-Ho ; Yoo, Seong-Hwan ; Chang, Seung-Hwan ;
Composites Research, volume 26, issue 6, 2013, Pages 386~391
DOI : 10.7234/composres.2013.26.6.386
In this paper, a carbon fiber/epoxy composite-aluminum hybrid wheel for passenger cars was suggested for better performance and a prototype was fabricated and tested. Adhesive bonding between aluminum part and a composite rim part was used, and the bonding length and thickness were determined by finite element analysis. For self alignment and the function of bonding jig the special structure with a groove and a protrusion was applied. To evaluate the performance of the hybrid wheel various FE analyses were carried out. Inner and outer molds were prepared for the composite rim part and the thermoformed composite part was bonded to the aluminum part. Vibration tests revealed that the hybrid wheel had 16% higher resonance frequency and 32% higher damping capacity with 10% weight reduction.
Micromechanics Modeling of Functionally Graded Materials Containing Multiple Heterogeneities
Yu, Jaesang ; Yang, Cheol-Min ; Jung, Yong Chae ;
Composites Research, volume 26, issue 6, 2013, Pages 392~397
DOI : 10.7234/composres.2013.26.6.392
Functionally graded materials graded continuously and discretely, and are modeled using modified Mori- Tanaka and self-consistent methods. The proposed micromechanics model accounts for multi-phase heterogeneity and arbitrary number of layers. The influence of geometries and distinct elastic material properties of each constituent and voids on the effective elastic properties of FGM is investigated. Numerical examples of different functionally graded materials are presented. The predicted elastic properties obtained from the current model agree well with experimental results from the literature.