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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
Mixed-mode fracture toughness measurement of a composite/metal interface
Kim, Won-Seock ; Jang, Chang-Jae ; Lee, Jung-Ju ;
Composites Research, volume 24, issue 2, 2011, Pages 1~8
DOI : 10.7234/kscm.2011.24.2.001
Interfacial fracture toughness under various mixed-mode loading is measured to provide a mixed-mode fracture criterion of a composite/metal bonded joint. Experimental fracture characterization tests were carried out using a SLB (single leg bending) specimen, which controls mode ratio with the specimen thickness. The experimental result of the SLB test conforms that interfacial fracture toughness increases as the mode II component increases. The effect of loading mode on interfacial crack growth is investigated on the basis of crack path observation using microscopic image acquisition technique. The influence of interfacial roughness on adhesion strength is also discussed.
A molecular dynamics simulation on the defect structure in silicon under indentation
Trandinh, Long ; Ryu, Yong-Moon ; Kang, Woo-Jong ; Cheon, Seong-Sik ;
Composites Research, volume 24, issue 2, 2011, Pages 9~13
DOI : 10.7234/kscm.2011.24.2.009
,In this paper, the symmetric axis parameter method, which was proposed to identify defects, dislocations and stacking fault, with perfect structures in the zinc-blende materials, was introduced as a way to distinguish between elastic and plastic deformation. LAMMPS, a molecular dynamics programme of Sandia National Laboratories, was used to perform nanoindentation simulation on silicon, a zinc-blende material. Defects in silicon (111) under spherical indentation showed the threefold pattern and the slip system in the form of ring crack. Also simulation results show good agreement with experimental results and existing theoretical analyses.
A Study on the Vibration Analysis for the Composite Multi-axial Optical Structure of an Aircraft
Kim, Dae-Young ; Kwak, Jae-Hyuck ; Lee, Jun-Ho ; Park, Kwang-Woo ; Jeong, Kwang-Young ; Cheon, Seong-Sik ;
Composites Research, volume 24, issue 2, 2011, Pages 14~21
DOI : 10.7234/kscm.2011.24.2.014
In this paper, a dynamic model is proposed for multi-axis optical structure of an aircraft. Modal analysis, sine-wave analysis, and random vibration analysis are done using a multi-body dynamic program for the multi-axis optical structure. By applying Al 6061-T6 and two types of CFRP to the camera module, x, y, and z responses are found and compared according to each axis excitation. The results will be used for reducing the weight of the camera module.
Behavior and Optimization of Cylinder Applied by Composite Tape Wrapping Method
Lee, Kyeong-Kyoo ; Kim, Wie-Dae ;
Composites Research, volume 24, issue 2, 2011, Pages 22~29
DOI : 10.7234/kscm.2011.24.2.022
To increase the performance of thick-walled cylinders recently their length is continually enlarged. For that reason it is important to reduce weight of the thick-walled cylinders. In this paper the FE models to predict and estimate effects on the composite tapes were created with MSC.Nastran/Patran v.2005. First of all a autofrettage method was applied to the 2D model of the AISI4340 cylinder reduced the thick. And then the comparison of the numerical results with analysis results showed and verified by using T300/5208, IM7/PETI5, IM7/8552 tapes. Those are predicted to the effects of the angle of the composite tapes and elastic modulus according to the composite properties.
Wettability Evaluation of Resin on the Glass Fabric
Han, Seung-Wook ; Choi, Nak-Sam ; Lee, Min-Soo ; Ahn, Hung-Kun ;
Composites Research, volume 24, issue 2, 2011, Pages 30~37
DOI : 10.7234/kscm.2011.24.2.030
Analysis of wettability between epoxy resin and glass fabric was studied. The mixing ratios of epoxy resin and anhydride hardener were varied as 1:0.5, l:l and l:1.2. Catalyst content was fixed as 0.1wt% of the mixed resin. A curing analysis by differential scanning calorimeter(DSC) showed a possible impregnation of the mixed resin at the room temperature. An effective contact angle of the mixed epoxy resin drop onto the glass fabric being preset on a flat glass plate was measured as a function of time. The wet area of the epoxy resin drop was also measured. Behaviors of the contact angle, the droplet height, the neat wet area and the coefficient of wettability were used to evaluate the wettability of the epoxy resin onto the glass fabric. It was concluded that the equivalent ratio of 1: 1.2 was the most suitable for the wettability.
Study on Design and Performance of Microwave Absorbers of Carbon Nanotube Composite Laminates
Kim, Jin-Bong ; Kim, Chun-Gon ;
Composites Research, volume 24, issue 2, 2011, Pages 38~45
DOI : 10.7234/kscm.2011.24.2.038
In this paper, we present an optimization method for the single Dallenbach-layer type microwave absorbers composed of E-glass fabric/epoxy composite laminates. The composite prepreg containing carbon nanotubes (CNT) was used to control the electrical property of the composites laminates. The design technology using the genetic algorithm was used to get the optimal thicknesses of the laminates and the filler contents at various center frequencies, for which the numerical model of the complex permittivity of the composite laminate was incorporated. In the optimal design results, the content of CNT increased in proportion to the center frequency, but, on the contrary, the thickness of the microwave absorbers decreased. The permittivity and reflection loss are measured using vector network analyzer and 7 mm coaxial airline. The influence of the mismatches in between measurement and prediction of the thickness and the complex permittivity caused the shift of the center frequency, blunting of the peak at the center frequency and the reduction of the absorbing bandwidth.
Technological Review on the Development of Metallic Armor Materials
Kim, Hong-Kyu ; Hong, Sung-Suk ; Shim, In-Ok ;
Composites Research, volume 24, issue 2, 2011, Pages 46~50
DOI : 10.7234/kscm.2011.24.2.046
This paper describes the state of the art for the development of metallic armor materials which are mainly used as armor plates of the combat vehicles. Several important micro-structural features affecting ballistic properties of the metallic armor are discussed. Optimization of the strength and toughness balance of the metallic armor is necessary for the improvement of the ballistic performance resulting from maximizing the resistance to the penetration of the bullet and also to brittle failure of the plates. Understanding and control of the adiabatic shearing phenomenon developed remarkably during high strain rate deformation is needed to prevent brittle failure of the metallic armor materials.