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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal Basic Information
Journal DOI :
The Korean Society for Composite Materials
Editor in Chief :
Volume & Issues
Volume 13, Issue 6 - Dec 2000
Volume 13, Issue 5 - Oct 2000
Volume 13, Issue 4 - Aug 2000
Volume 13, Issue 3 - Jun 2000
Volume 13, Issue 2 - Apr 2000
Volume 13, Issue 1 - Feb 2000
Selecting the target year
An Experimental Study on Mortar Beam Stengthened by Composite Material
Composites Research, volume 13, issue 3, 2000, Pages 1~8
Excellent environmental durability and handy installation procedure as well as high specific strength and stiffness have introduced fiber-reinforced polymeric composite materials into the civil and architectural engineering field. This study presents the considerably enhanced strength characteristics of the mortal beams by being reinforced with epoxy-bonded carbon fiber sheets(CFS). Three point bending and Charpy impact tests were performed on both of bare and reinforced mortar specimens. The influences of length, and the number of reinforcing plies were investigated. Strength reduction due to pre-existent notch was lessened dramatically. The acoustic emission(AE) measurement revealed the progressive damage process in reinforced specimens.
Free Vibration Characteristics of a Composite Beam with Multiple Transverse Open Cracks
Composites Research, volume 13, issue 3, 2000, Pages 9~20
Free vibration characteristics of a cantilevered laminated composite beam with multiple non-propagating transverse open cracks are investigated. In the present analysis a special ply-angle distribution referred to as asymmetric stiffness configuration inducing the elastic coupling between chord-wise bending and extension is considered. The multiple open cracks are modelled as equivalent rotational springs whose spring constants are calculated based on the fracture mechanics of composite material structures. Governing equations of a composite beam with open cracks are derived via Hamilton's Principle and Timoshenko beam theory encompassing transverse shear and rotary inertia effect is adopted. The effects of various parameters such as the ply angle, fiber volume fraction, crack numbers, crack positions and crack depthes on the free vibration characteristics of the beam with multiple cracks are highlighted. The numerical results show that the existence of the multiple cracks in an anisotropic composite beam affects the free vibration characteristics in a more complex fashion compared with the beam with a single crack.
Optimum Design for Iso-strain Structure of Hybrid Laminated Composite
Composites Research, volume 13, issue 3, 2000, Pages 21~29
The optimum design of hybrid laminated composites for iso-strain structure has been studied by controling fiber orientations and thicknesses of each layer. Fiber orientations and thicknesses of each layer for iso-strain structure were designed. Combining the laminates of each layer of different reinforcing material, the constitutions of hybrid laminated composite for iso-strain structure were obtained. All these calculations were formed on computer systems, automatically for the hybridization. Using the data of some specific laminated composite such as glass and aramid reinforced composites, the constitutions of hybrid laminated composites for iso-strains structure were designed and verified by lamination theory. The strains of each layer of hybrid laminated composites are calculated and they turned out to be good agreements with the results obtained lamination theory.
The Influence of Interphase Condition and Fiber Content on the Dynamic Properties of Short-fiber Reinforced Rubber
Composites Research, volume 13, issue 3, 2000, Pages 30~37
The dynamic properties of short-fiber reinforced Chloroprene rubber have been studied as functions of interphase conditions and fiber content. The loss factor generally decreased with fiber content and showed different patterns according to interphase conditions. The better interphase condition showed the lower loss modulus,
. Also, the dynamic ratio decreased with fiber content and rapidly decreased in the case of double coatings, i.e., model C. Therefore, the short-fiber reinforced rubber could have the better isolation in frequency ratio(
min.) compared to frequency ratio(
max.). And we have investigate the possibility of applying short-fiber reinforced rubber to automotive engine mount.
A Study on the Coating Cracking on a Substrate in Bending I : Theory
Sung-Ryong Kim ; John A. Nairn ;
Composites Research, volume 13, issue 3, 2000, Pages 38~47
The coating cracking on a substrate system was analyzed using a fracture mechanics approach. Multiple cracking in the bending configuration was analyzed using a variational mechanics approach to fracture mechanics of coatin
strate system. The strain energy release rate on bending geometry developed permits the prediction of crack growth in the coating layer on a substrate. Also, it can be used appropriately to the characterization of multiple cracking of coating. The obtained critical strain energy release rate (in-situ fracture toughness) will be a material property of coating and it will provide a better insight into coating cracking.ng.
A Study on the Coating Cracking on a Substrate in Bending II : Experiment
Sung-Ryong Kim ; John A. Nairn ;
Composites Research, volume 13, issue 3, 2000, Pages 48~57
Fracture analysis of coating cracking on a substrate system described in a companion paper was applied and verified by four-point bending tests. The multiple cracking of coating was predicted using a fracture mechanics approach. The strain energy release rate (G) due to the formation of a new crack in a coating was obtained. A crack density vs. strain data of metallic and polymeric substrate was used to get the in-situ fracture toughness of coating with respect to various baking time and temperature. The
was decreased as the baking temperature and time was increased. This paper gave insight about usefulness of four-point bending test for fracture toughness evaluation of coating and it gave a new method for in-situ coating toughness.
The Study on Notch Strength Characteristics with Circular Hole Notch in A17075/CFRP Layered Composites
Composites Research, volume 13, issue 3, 2000, Pages 58~66
CARALL(Carbon fiber reinforced aluminum laminates) was fabricated with CFRP prepreg and A17075, using a autoclave. The mechanical properties of three samples i.e. A17075, CFRP and CARALL were also investigated as a function of size in circular holes. Theoretical approach into analysing mechanical behaviors near the circular hole notch was carried out to compare with experimental data, furthermore. By the adhesive bonding of A17075 to CFRP, abrupt strength reduction was prevented. From the consideration of modified point stress failure criterion, predicted results was well consistent with the experimental one.