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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
Effect of Graphene Oxide on the Properties of Its Composite Fibers with PMMA and Nylon 6,6
Hwang, Sang-Ha ; Lee, Dong-Wook ; Baek, Jong-Beom ; Shin, Hyeon-Suk ; Park, Young-Bin ;
Composites Research, volume 24, issue 4, 2011, Pages 1~4
DOI : 10.7234/kscm.2011.24.4.001
In this work, we successfully fabricated graphene oxide (GO) and GO-based PMMA composite fiber and nylon films. Dynamic mechanical and tensile properties of PMMA-GO composite fiber showed that GO is efficient reinforcement for polymer matrices. However, Nylon 6,6-GO composite films showed low reinforcement efficiency in terms of dynamic mechanical and tensile properties due to the colloid instability of GO in formic acid at a low pH level.
A Study on the Effect of CNT on Crystallization Kinetics and Hydrolytic Degradation of PKA/CNT Composite
Li, Mei-Xian ; Kim, Sung-Ha ; Kim, Si-Hwan ; Park, Jong-Kyoo ; Lee, Woo-Il ;
Composites Research, volume 24, issue 4, 2011, Pages 5~10
DOI : 10.7234/kscm.2011.24.4.005
As environmental pollution getting worse, biodegradable materials have been drawn more attention than ever. In this study, polylactic acid (PLA)/carbon nanotubc (CNT) nanocomposites were manufactured via extrusion molding and injection molding, In order to change the crystallinity, annealing treatment was done for different time span, Crystallization kinetics of PLA was analyzed by differential scanning calorimeter (DSC), and it was confirmed that a proper amount of CNT can increase the crystallization rate of PLA. In addition, the presence of CNT significantly accelerates the hydrolytic degradation rate of PLA, however, it decreases with the increase of crystallinity. The reason is that degradation may occur in the PLA/CNT interface easily, and the molecular structure of the composite becomes dense with the increase of crystallinity.
Inherent and Interfacial Evaluation of Fibers/Epoxy Composites by Micromechanical Tests at Cryogenic Temperature
Kwon, Dong-Jun ; Wang, Zuo-Jia ; Gu, Ga-Young ; Um, Moon-Gwang ; Park, Joung-Man ;
Composites Research, volume 24, issue 4, 2011, Pages 11~16
DOI : 10.7234/kscm.2011.24.4.011
Retention of interfacial shear strength (IFSS) of polymer composites at cryogenic temperature application is very important. In this work, single carbon tiber reinforced epoxy compositc was used to evaluate IFSS and apparent modulus under room and cryogenic temperatures. The property change of carbon and selected epoxy for particularly cryogenic temperature application were tested in tension and compression. Tensile strength and elongation of carbon fiber decreased at cryogenic temperature, whereas tensile modulus was almost same. On the other hand, epoxy matrix showed the increased tensile strength but decreased elongation. It can be due to maximum thermal contraction existing free volume in cryogenic temperature. IFSS increased up to
and then decreased steadily. However, IFSS at cryogenic temperature was still similar to that at room temperature. This result is very useful to cryogenic application since selected epoxy toughness and interfacial adhesion can keep at such low temperature.
Buckling Analysis and Test of Composite Sandwich Cylinder for Underwater Application
Kim, Ji-Seon ; Lee, Gyeong-Chan ; Kweon, Jin-Hwe ; Cho, Jin-Ho ; Cho, Jong-Rae ; Cho, Sang-Rae ; Cho, Yoon-Sik ;
Composites Research, volume 24, issue 4, 2011, Pages 17~22
DOI : 10.7234/kscm.2011.24.4.017
In this paper, as a basic research to apply the composite sandwich to underwater vehicle, the manufacturing, analysis and test methods, and weight saving effect of a composite sandwich cylinder under external pressure were studied. A two-step manufacturing method to prevent the wrinkling of the sandwich cylinder face was proposed and the three cylinders were made and tested. Finite element results based on the shell and solid model using MSC.Nastran were compared with test results. The comparison showed that the linear finite element analysis using the shell and solid elements can predict the buckling pressure of the sandwich cylinder with approximately 3% difference. The parametric study of the filament wound cylinders revealed that the composite sandwich can reduce the weight of the cylinder more than 30% compared with the filament wound cylinder supporting the same pressure.
Comparison of Optimum Drilling Conditions of Aircraft CFRP Composites using CVD Diamond and PCD Drills
Kwon, Dong-Jun ; Wang, Zuo-Jia ; Gu, Ga-Young ; Park, Joung-Man ;
Composites Research, volume 24, issue 4, 2011, Pages 23~28
DOI : 10.7234/kscm.2011.24.4.023
Recently CFRP laminate joints process by bolts and nets are developed rapidly in aircraft industries. However, there are serious drawback during jointing process. Many hole processes are needed for the manufacturing and structural applications using composite materials. Generally, very durable polycrystalline crystalline diamond (PCD) drill has been used for the CFRP hole process. However, due to the expensive price and slow process speed, chemical vapor deposition (CVD) diamond drill has been used increasingly which are relatively-low durability but easily-adjustable process speed via drill shape change and price is much lower. In this study, the comparison of hole process between PCD and CVD diamond coated drills was done. First of all, CFRP hole processbility was evaluated using the equations of hole processing conditions (feed amount per blade, feed speed). The comparison on thermal damage occurring from the CFRP specimen was also studied during drilling process. Empirical equation was made from the temperature photo profile being taken during hole process by infrared thermal camera. In addition, hole processability was compared by checking hole inside condition upon chip exhausting state for two drills. Generally, although the PCD can exhibit better hole processability, hole processing speed of CVD diamond drill exhibited faster than PCD case.
A Method to Predict the Open-Hole Tensile Strength of Composite Laminate
Lee, Heun-Ju ; Shin, In-Soo ; Jeong, Mun-Gyu ; Kweon, Jin-Hwe ; Choi, Jin-Ho ;
Composites Research, volume 24, issue 4, 2011, Pages 29~35
DOI : 10.7234/kscm.2011.24.4.029
The characteristic length method used to determine a laminate's strength generally requires the test for un-notched and notched laminates and finite element analysis together. In this paper, the methods used to predict the stress distribution and tensile characteristic length of open-hole laminates using the stress concentration factor and equivalent material properties are proposed. These methods do not require data on the failure load of open-hole laminates or finite element analysis. Once the stress and characteristic length have been determined, the failure load of the open-hole laminate can be calculated. The proposed method considers the effect of the material properties as a parameter and therefore can be applied to a variety of materials. The stress distribution is verified by comparing with a finite element analysis and test results. The predicted failure load shows a maximum deviation of 8% from the test results.
Damage Evaluation for High Pressure Fuel Tank by Analysis of AE Parameters
Jee, Hyun-Sup ; Lee, Jong-O ; Ju, No-Hoe ; Lee, Jong-Kyu ; So, Cheal-Ho ;
Composites Research, volume 24, issue 4, 2011, Pages 36~40
DOI : 10.7234/kscm.2011.24.4.036
This paper described analysis of acoustic emission parameter for the damage evaluation of type II vehicle fuel tank during fracture test. The observation of Kaiser effect, Felicity effect and creep effect is the means of damage evaluation method. It is possible to evaluate tank damage by the ratio of hit of over 60 dB and total hit. Damage mechanism of pressure tank can be estimated by analysis of average rise time, average amplitude.
A study on structure analysis system for short fiber reinforced plastics
Youn, Jee-Young ; Kim, Sang-Woo ; Park, Bong-Hyun ; Lee, Seong-Hoon ; Kwon, Tai-Hun ; Kim, Ki-Tae ;
Composites Research, volume 24, issue 4, 2011, Pages 41~47
DOI : 10.7234/kscm.2011.24.4.041
This paper deals with anisotropic property and structural analysis for short fiber reinforced plastic composites manufactured by the injection molding process. The common approach for modeling this type of material is the consideration of the material as homogenous and isotropic. However, the common isotropy approach often results in unexpected failure. To overcome this, new structure analysis methodology was developed in order to consider fiber orientation effect using injection mold flow analysis and Halpin-Tsai equations for unidirectional composites and taking an orientation average. The numerical predictions are compared to experimental data for tensile specimen. The predicted mechanical properties agree well with experimental data for fiber orientation and weld line effect. The analysis system was also applied to an automobile part. The proposed anisotropic model predicted different mechanical properties by position of the part and different mechanical performance of the part was changed according to injection gate position.
Strength of Composit Single-lap Bonded Joints with Different Saltwater Moisture Contents
Yang, Hyeon-Jeong ; Jeong, Mun-Gyu ; Kweon, Jin-Hwe ; Choi, Jin-Ho ;
Composites Research, volume 24, issue 4, 2011, Pages 48~54
DOI : 10.7234/kscm.2011.24.4.048
The effect of moisture contents by salt water on the strength of composite single-lap bonded joints is investigated. The specimens were manufactured in an autoclave by secondary bonding and immersed in the 3.5% salt water of
for different durations to get various moisture contents; 0, 0.2, 0.5, 1.0, and 2.0%(saturation). A total of 80 joint specimens were tested for 5 different moisture contents and 2 temperature environments. Test results show that while the joint strengths after the saturation of moisture decrease compared to those of dry ones, the strengths of the pre-saturated joint up to 1.0% of moisture content increase in both room and elevated temperature conditions. It is also shown that the strengths of joints tested in elevated temperature are slightly higher than the strength in room temperature by 2-5% until the moisture content reaches 1 %. In contrast, the high temperature strength of the saturated joint is about 5% lower than the room temperature strength.