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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 22, Issue 6 - Dec 2009
Volume 22, Issue 5 - Oct 2009
Volume 22, Issue 4 - Aug 2009
Volume 22, Issue 3 - Jun 2009
Volume 22, Issue 2 - Apr 2009
Volume 22, Issue 1 - Feb 2009
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Low-Velocity Impact Response and Damage Analysis of Composite Laminates Under Initial In-plane Loading
Choi, Ik-Hyeon ;
Composites Research, volume 22, issue 1, 2009, Pages 1~8
In this paper low-velocity impact response and damage of composite laminates is analytically investigated. A modified displacement field of plate considering initially loaded in-plane strain is proposed. From the displacement field a finite element equation on structural behavior of composite laminate is newly induced and a computational program is coded. Numerical results using the FEM code is compared with the numerical ones from reference. Additional numerical analysis is performed on another impact condition and effect of initial in-plane load is reviewed. Potential delamination damage area in the first inter-ply surface from bottom of laminate is approximated and effect of initial in-plane load and impact condition is also reviewed.
Crack Detection of Carbon Fiber Reinforced Composites by Electric Potential Method with Bridge Circuit Concept
Hwang, Hui-Yun ;
Composites Research, volume 22, issue 1, 2009, Pages 9~14
This paper suggested the electric potential method with a bridge circuit concept for the detection of the location and crack growth of carbon fiber reinforced composites to reduce the measurement numbers. 2 pairs of electrodes were fabricated on the center cracked thin composite plates, and potential changes at one pair of adjacent electrodes were observed while external voltage input was applied to the other pair of adjacent electrodes. The effects of the size and interval of electrodes, location and propagating direction of center cracks were investigated by experiments and finite element analyses. Detectable crack size was influenced by the electrode interval rather than the electrode size, and crack detection was enhanced as the size and interval of electrodes were smaller. Besides, output potential changes were larger as the crack grew and was nearer the voltage input electrodes.
Compressive Characteristics of Composites According to the Micro-structure and Stacking angle
Yoo, Seong-Hwan ; Park, Seok-Won ; Chang, Seung-Hwan ;
Composites Research, volume 22, issue 1, 2009, Pages 15~21
In this paper, static compressive test and compression-compression fatigue test of carbon/epoxy composites which have different micro-structures were carried out with respect to the bias angle. In order to find out the effect of the micro-structure of the fabric composite on compressive characteristics the specimens made of UD carbon/epoxy composite comprising the same fiber and matrix system as the fabric composite were also prepared. The compressive strength and modulus were measured and these values were used to develop a semi-empirical formula for predicting compressive strength of the fabric composite with bias angles. The fatigue behavior of the fabric composite with respect to the bias angle variation was also investigated.
Investigation on Design and Impact Damage for a 500W Wind Turbine Composite Blade
Kong, Chang-Duk ; Choi, Su-Hyun ; Park, Hyun-Bum ; Kim, Sang-Hoon ;
Composites Research, volume 22, issue 1, 2009, Pages 22~31
Recently the wind energy has been alternatively used as a renewable energy resource instead of the mostly used fossil fuel due to its lack and environmental issues. This work is to propose a structural design and analysis procedure for development of the 500W class small wind turbine system which will be applicable to relatively low speed region like Korea and for the domestic use. The wind turbine blade was performed structural analysis including stress, deformation, buckling, vibration and fatigue. In addition, the blade should be safe from the impact damage due to FOD(Foreign Object Damage) including the bird strike. MSC.Dytran was used in order to analyze the bird strike penomena on the blade, and the applied method Arbitrary Lagrangian-Eulerian was evaluated by comparison with the previous study results. Finally, the structural test was carried out and its test results were compared with the estimated results for evaluation of the designed structure.
Monitoring of Tunnel Structure using Fiber Bragg Grating Sensors
Kim, Ki-Soo ;
Composites Research, volume 22, issue 1, 2009, Pages 32~38
Recently structural monitoring using fiber optic sensors became popular, but the fiber sensors are very difficult to apply to the real structure due to difficulty of handling. In this research, we developed the fiber sensor packages easy to attach or fasten to the structures like ordinary electric sensors. We apply the fiber sensors to the real tunnel structure for measuring the strains and shape changes. The applied fiber optics sensors show the behavior of tile tunnel structures. We summarize the data from tunnel for 2 year construction period and confirm the structural behavior of tunnel.