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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 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
Research on the development of the properties of PLA composites for automotive interior parts
Jung, Jae-Won ; Kim, Seong-Ho ; Kim, Si-Hwan ; Park, Jong-Kyoo ; Lee, Woo-Il ;
Composites Research, volume 24, issue 3, 2011, Pages 1~5
DOI : 10.7234/kscm.2011.24.3.001
Since the environmental problems and new stricter regulations are forcing the industries to introduce more ecological materials for their products, biodegradable materials have attracted increasing attention. Among these materials, Polylactic acid(PLA) is a promising candidate for its modulus, strength, chemical resistance. However, PLA could not be used for automobile industries for its low heat resistance and impact strength. In this study natural fibers were (jute fiber was) introduced as reinforcements in order to improve heat resistance and impact strength of PLA. Especially for improving the adhesion between PLA and jute, various surface treatments were tried. With each treatment, we verified that the impact strength of composite was improved. With annealing treatment, we found a remarkable increase of heat resistance of PLA composite.
A basic study on the prediction of local material behavior of composite bone plate for metaphyseal femur fractures
Yoo, Seong-Hwan ; Son, Dae-Sung ; Chang, Seung-Hwan ;
Composites Research, volume 24, issue 3, 2011, Pages 6~11
DOI : 10.7234/kscm.2011.24.3.006
This paper presents an estimating method for local property changes and failure prediction of composite materials experiencing large shear deformation during draping process. The bone plate for the metaphyseal femur fracture was chosen to apply the presented method because it has complex geometry. The local property changes due to macro-/microscopic deformations of fabric composites during draping process were evaluated by various tests and the result was applied to predict static/fatigue behaviors of the bone plate. This paper was expected to present useful information on the design of composite structures with complex geometry and their performance evaluation.
High Strain Rate Tensile Test of Composite Material for Automotive Front End Module Carrier
Kang, Woo-Jong ; Kim, Sung-Tae ;
Composites Research, volume 24, issue 3, 2011, Pages 12~16
DOI : 10.7234/kscm.2011.24.3.012
High strain rate tensile tests were performed to measure the strain rate sensitivity of fiber reinforced composite material. The composite material was developed for the light weight design of an automotive FEM(front end module) carrier. Standard specimens for quasi-static tests of fiber reinforced composites can be found in ASTM D3039. However, in case of high strain rate tests, it was hard to find standard specimen shapes. In this study, three kinds of tensile specimens designed based on ASTM D638 were investigated to determined the adequate gauge width of tensile specimen for fiber reinforced composite. A drop tower type of high speed tensile apparatus was developed for strain rates of about 15/s and 100/s. Gauge width of 6mm, 8mm and 10mm were investigated. Test results showed the specimen of 8mm width was adequate for the high strain rate tensile tests of fiber reinforced composite. It was found the strength of the composite material increased as the strain rate increased.
Nanoindentation on the Layered Ag/Cu for Investigating Slip of Misfit Dislocation
Trandinh, Long ; Ryu, Yong-Moon ; Cheon, Seong-Sik ;
Composites Research, volume 24, issue 3, 2011, Pages 17~24
DOI : 10.7234/kscm.2011.24.3.017
The EAM simulation of nanoindentation was performed to investigate misfit dislocation slip in the Ag/Cu. The film layer, whose thickness in the range of 2-5nm, was indented by a spherical indenter with the N
se-Hoover thermostat condition. The simulation shows that the indentation position relative to misfit dislocation (MFD) has the effect on the dislocation, glide up or cross slip, for Ag film layer thickness less than 4 nm. Elastic energy variation during MFDs slip was revealed to be a key factor for the softening of Ag/Cu. The critical film layer thickness was evaluated for each case of Ag/Cu according to the spline extrapolation technique.
Crack Detection of Composite Cylinders under external pressure using the Acoustic Emission
Park, Jin-Ha ; Choi, Jin-Ho ; Kweon, Jin-Hwe ;
Composites Research, volume 24, issue 3, 2011, Pages 25~30
DOI : 10.7234/kscm.2011.24.3.025
The studies on the non-destructive testing methods of the composite materials are very important for improving their reliability and safety. AE(Acoustic Emission) can evaluate the defects by detecting the emitting strain energy when elastic waves are generated by the generation and growth of a crack, plastic deformation, fiber breakage, matrix cleavage or delamination. In this paper, the AE signals of the filament wound composite cylinder and sandwich cylinder during the pressure test were measured and analyzed. The signal characteristics of PVDF sensors were measured, and an AE signal analyzer which had the band-pass filter and L-C resonance filter were designed and fabricated. Also, the crack detection capability of the fabricated AE signal analyzer wes evaluated during the pressure tests of the filament wound composite cylinder and the sandwich cylinder.
Computational analysis of sandwich shield with free boundary inserted fabric at hypervelocity impact
Moon, Jin-Bum ; Park, Yu-Rim ; Son, Gil-Sang ; Kim, Chun-Gon ;
Composites Research, volume 24, issue 3, 2011, Pages 31~38
DOI : 10.7234/kscm.2011.24.3.031
In this paper, a novel hybrid composite shield to protect space structures from hypervelocity impact of micrometeoroid and space debris is proposed. The finite element model of the proposed shield was constructed and finite element analysis was conducted to approximate the energy absorption rate. Before the final model analysis, analysis of each component including the aluminum plate, PMMA plate, and intermediate layer of fabric was performed, verifying the finite element model of each component. The material properties used in the analyses were predicted material property values for high strain rates. The analysis results showed that, other than the fabric, the energy absorption rate of each component was in agreement. Afterwards, the finite element model of the hybrid composite shield was constructed, where it was analyzed for the restrained and unrestrained fabric boundary condition cases. Through the finite element analysis, the fiber pullout mechanism was realized for the hybrid shield with free boundary inserted fabric, and it was observed that this mechanism led to energy absorption increase.
Evaluations of lap shear and peel strength for epoxy and polyurethane adhesive bonded Triplex sheets at cryogenic temperatures
Shon, Min-Young ;
Composites Research, volume 24, issue 3, 2011, Pages 39~45
DOI : 10.7234/kscm.2011.24.3.039
Adhesive joints are widely used for structural joining applications in various fields and environmental conditions. Polyurethane (PU) and Epoxy adhesives are now being used for liquefied natural gas (LNG) carriers at cryogenic temperatures. This paper presents a comprehensive evaluation of epoxy and PU adhesive bonds between Triplex sheets at normal and cryogenic temperatures. The most significant result of this study is that for all adhesives tested, there is a significant decrease in peel strength at cryogenic temperatures. However, the reasons for the decrease in peel strength for epoxy and PU adhesives differ. Consequently, PU adhesives can be considered better suited for use in applications requiring high bonding performance at cryogenic conditions, such as in LNG carriers.