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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 24, Issue 6 - Dec 2011
Volume 24, Issue 5 - Oct 2011
Volume 24, Issue 4 - Aug 2011
Volume 24, Issue 3 - Jun 2011
Volume 24, Issue 2 - Apr 2011
Volume 24, Issue 1 - Feb 2011
Selecting the target year
Size effect on tensile strength of filament wound CFRP composites
Hwang, T.K. ; Doh, Y.D. ; Kim, H.G. ;
Composites Research, volume 24, issue 5, 2011, Pages 1~8
DOI : 10.7234/kscm.2011.24.5.001
This paper presents the results of theoretical analysis and experimental test to show the size effect on the fiber strength of filament would pressure vessel. First, a series of fully scaled hoop ring tests with filament would carbon-epoxy were conducted, which exhibited a remarkable size effect on the fiber strength. Next, the failure analyses using WWLM(Weibull Weakest Link Model) and the SMFM(Sequential Multi-step Failure Model) were performed and compared to the hoop ring test data, as well as to unidirectional specimens test data from the literature. It was found that the analysis results significantly underestimated the fiber strengths compared to the test data. In this study, a modified SMFM was proposed through the modification of the length size effect. The fiber strengths from modified SMFM analysis showed good agreement with the test data.
A Study on the Crashworthiness Evaluation and Performance Improvement of Tilting Train Carbody Structure made of Sandwich Composites
Jang, Hyung-Jin ; Shin, Kwang-Bok ; Han, Sung-Ho ;
Composites Research, volume 24, issue 5, 2011, Pages 9~16
DOI : 10.7234/kscm.2011.24.5.009
This paper describes the crashworthiness evaluation and performance improvement of tilting train made of sandwich composites. The applied sandwich composite of carbody structure was composed of aluminum honeycomb core and glass/epoxy & carbon/epoxy laminate composite facesheet. Crashworthiness analysis of tilting train was carried out using explicit finite element analysis code LS-DYNA 3D. The 3D finite element model and 1D equivalent model were applied to save the finite element modeling and calculation time for crash analysis. The crash conditions of tilting train were conducted according to four crash scenarios of the Korean railway safety law. It found that the crashworthiness analysis results were satisfied with the performance requirements except the crash scenario-2. In order to meet the crashworthiness requirements for crash scenario-2, the stiffness reinforcement for the laminate composite cover and metal frames of cabmask structure was proposed. Consequentially, it has satisfied the requirement for crash scenario-2.
Surface control and durability evaluation of CNT and ITO coated PET transparent electrode with different dry conditions
Kwon, Dong-Jun ; Wang, Zuo-Jia ; Gu, Ga-Young ; Park, Joung-Man ;
Composites Research, volume 24, issue 5, 2011, Pages 17~22
DOI : 10.7234/kscm.2011.24.5.017
Recently transparent electrodes using carbon nanotube (CNT) have been studied actively to replace conventional ITO. In this work, CNT or ITO coated poly(ethylene terephthalate) (PET) were prepared by controlling the surfaces since the cohesion degree depends upon drying conditions. As transparent electrode application, 3 drying temperatures were set as 20, 80, and
to produce the change of surface properties. Interfacial durability and electrical properties of prepared transparent electrodes were evaluated by electrical resistance measurement. Surface change with changing drying temperature was observed by FE-SEM, whereas the transparency change was measured by UV-spectroscopy. The electronic properties of nanoparticle coated surface were evaluated using cyclic voltametry method upon the surface change with controlled drying temperature. Durability of CNT coated surfaces was better than ITO coated ease. As drying temperature increased, better coated surface was prepared due to improved cohesion among nanoparticles, which resulted in increased electrical properties.
A study on the bonding strength of co-cured T800/epoxy composite-aluminum single lap joint according to the forming and additional pressures
Son, Dae-Sung ; Bae, Ji-Hun ; Chang, Seung-Hwan ;
Composites Research, volume 24, issue 5, 2011, Pages 23~28
DOI : 10.7234/kscm.2011.24.5.023
In this paper, the bonding strengths of co-cured T800 carbon/epoxy composite-aluminum single lap joints with and without additional pressures were investigated using the pressure information induced by the fiber tension during a filament winding process. The specimens of all the tests were fabricated by an autoclave vacuum bag de-gassing molding being controlled forming pressures (absolute pressures of 0.1MPa, 0.3MPa and 0.7MPa including vacuum). A special device which can act uniform additional pressures on the joining part of the single lap joint specimen was designed to measure the bonding strengths of composite-aluminum liners of type III hydrogen pressure vessel fabricated by a filament winding process. After the three different additional pressures (absolute pressures of 0.1MPa, 0.3MPa and 0.7MPa) were applied to the specimens the effect of the additional pressures on the bonding strengths of the co-cured single-lap joints were evaluated.
An Experimental Study on the shear connection for UHPC Deck Bridge
Yoo, Dong-Min ; Hwang, Hoon-Hee ; Kim, Sung-Tae ; Park, Sung-Young ;
Composites Research, volume 24, issue 5, 2011, Pages 29~33
DOI : 10.7234/kscm.2011.24.5.029
The application of high performance materials for the deck can represent a fair alternative to reduce the weight of the deck and improve the econimic efficiency of the bridge even if high performance materials are costly. In UHPC(Ultra High Performance Concrete) bridges, it is necessary to verify that exiting headed stud can be used to transfer longitudinal shear forces across the steel-concrete interface. In this paper, the push-out tests are performed to analisys the composite behavior between UHPC bridge deck and steel girder. The ultimate strength of test specimens is proportional to the diameter of headed studs in push-out test for static loading. Test results show that the shear strength of headed stud is improved for the case of normal concrete bridge decks.
Processing - Interlaminar Shear Strength Relationship of Carbon Fiber Composites Reinforced with Carbon Nanotubes
Kim, Han-Sang ;
Composites Research, volume 24, issue 5, 2011, Pages 34~38
DOI : 10.7234/kscm.2011.24.5.034
Carbon nanotubes (CNTs) have been widely investigated as reinforcements of CNT/polymer nanocomposites to enhance mechanical and electrical properties of polymer matrices since their discovery in the early 90's. Furthermore, the number of studies about incorporating CNTs into carbon fiber reinforced plastics (CFRP) to reinforce their polymer matrices is increasing recently. In this study, single-walled carbon nanotubes (SWNT) were dispersed in epoxy with 0.2 wt.% and 0.5 wt.%. Then, the SWNT/epoxy mixtures were processed to carbon fiber composites by a vacuum assisted resin transfer molding (VARTM) and a wet lay up method. The processed composite samples were tested for the interlaminar shear strength (ILSS). The relationship between the interlaminar shear strengths and processing, and the reinforcement mechanism of carbon nanotubes were investigated. CNT/epoxy nanocomposite specimens showed the increased tensile properties. However, the ILSS of carbon fiber composites was not enhanced by reinforcing the matrix with CNTs because of processing issues caused by increased viscosity of the matrix due to addition of CNTs particularly for a VARTM method.
Processing and Mode 1 Fracture Toughness of Carbon Fiber Composites Reinforced With Carbon Nanotubes
Kim, Han-Sang ;
Composites Research, volume 24, issue 5, 2011, Pages 39~43
DOI : 10.7234/kscm.2011.24.5.039
For the last twenty years, nanocomposites composed of polymer matrices reinforced with carbon nanotubes (CNTs) have been an active research area. Also, the polymeric nanocomposites reinforced with CNTs are being investigated to be used matrices of carbon fiber composites. Carbon tiber composites have achieved advanced properties in the direction of carbon fibers due to enhanced carbon fiber properties. However, the matrix dominated properties need to be improved further to fully utilize the advanced carbon fiber properties. In particular, delamination is a typical and critical reason for fracture of carbon fiber composites. Mode I fracture toughness test which is also often called double cantilever beam (DCB) test shows the resistance to delamination of carbon fiber composites and this test is performed on carbon fiber composite samples incorporated with carbon nanotubes functionalized with various functional groups. The specimens with mat-like CNT layers showed the increased fracture toughness by 10.6%.