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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 21, Issue 6 - Dec 2008
Volume 21, Issue 5 - Oct 2008
Volume 21, Issue 4 - Aug 2008
Volume 21, Issue 3 - Jun 2008
Volume 21, Issue 2 - Apr 2008
Volume 21, Issue 1 - Feb 2008
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An Experimental Study on the Mechanical Properties of Carbon-Epoxy Composites in Salt Water Environment
Hur, Seong-Hwa ; Kim, Jeong-Hee ; Kim, Hong-Seok ; Kweon, Jin-Hwe ; Choi, Jin-Ho ; Cho, Jong-Rae ; Cho, Yoon-Shik ;
Composites Research, volume 21, issue 3, 2008, Pages 1~8
The main objective of this study is to investigate the effect of salt water on the mechanical properties of a carbon-epoxy composite material. Specimens were made of a carbon-epoxy composite USN125 and tested under inplane tension and shear after 0, 0.5, 1, 2, 3, 6, 9, and 12 months immersion in 3.5% salt water. Waterproof painting and acceleration technique were not applied. The tensile strengths and moduli in fiber and matrix directions did not show any remarkable degradation until 12 months immersion. In contrast to the tensile properties, shear strength and modulus started to degrade from the early stage of the immersion time and gradually decreased to 36% and 46% of dry values, respectively, after 12 months immersion.
Evaluation of Residual Strength of CFRP Pressure Vessel After Low Velocity Impact
Park, Jae-Beom ; Kim, Dong-Ryun ; Kim, Hyung-Geun ; Hwang, Tae-Kyung ;
Composites Research, volume 21, issue 3, 2008, Pages 9~17
In this paper, the low velocity impact characteristics of filament winding CFRP pressure vessel was investigated using numerical and experimental methods. The cylinder part of CFRP vessel was impacted using triangular shape impactor which simulated the sharp edge of dropping tools and impact response behavior of CFRP was reviewed. The mechanical behavior, such as deformation and stress distribution, were also predicted by explicit finite element method and the validity of the model was investigated. For the quantitative evaluation of the residual strength of the pressure vessel after impact, a series of the ring specimens was cut from the impacted vessel and its burst pressure was measured by hydraulic pressure hoop tension test. As the results, the relationship between the residual strength degradation and the impact energy was successively obtained and a useful methodology to evaluate quantitatively the impact damage tolerance of CFRP pressure vessel was established.
Manufacturing and in vitro Characterization of Composite Drug Delivery System (DDS)
Chu, Won-Shik ; Jeong, Suk-Yong ; Park, Jeong-Bin ; Ahn, Sung-Hoon ; Lee, Jae-Hoon ; Chi, Sang-Chul ;
Composites Research, volume 21, issue 3, 2008, Pages 18~23
The Rapid Prototyping (RP) technology has advanced in many application areas. In this research, implantable Drug Delivery System (DDS) was fabricated by an RP system, Nano Composite Deposition System (NCDS). The DDS composite consists of 5-fluorouracil (5-FU), as drug particles, and PLGA85/15 as biodegradable polymer matrix. To have larger surface area, the DDS was fabricated in a scaffold shape, and its degradation was tested in vitro environment. Biocompatible Hydroxyapatite (HA) powders were added to the drug-polymer composite in order to control drug release. Test results showed a possibility of controlled release of scaffold DDS over 50 days.
Experimental Investigation on the Compression Behavior of Concrete Filled Circular FRP Tubes
Joo, Hyung-Joong ; Lee, Seung-Sik ; Kim, Young-Ho ; Park, Jong-Hwa ; Yoon, Soon-Jong ;
Composites Research, volume 21, issue 3, 2008, Pages 24~30
Durability problems may arise in the concrete, which is one of the major construction materials, used in the construction field. Bridge piers and foundation piles are usually made with concrete and they are exposed to the moisture and hence the durability of the concrete reduced significantly due to oxidization of re-bar and icing of concrete. To mitigate such problems, FRP tube has been developed and the concrete filled FRP tube (CFFT) has been investigated to find the confinement effect which is provided additionally. It was reported that if the concrete is wrapped with FRP, strength and chemical resistance are improved significantly. In order to apply such a member in the construction field, structural behavior and applicable design guideline or design criteria must be thoroughly investigated. In the experimental investigation, the results are compared with the previous research results and the relationship which can predict the ultimate strength and strain is suggested. In addition, some comments found at the compression tests are given briefly.