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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 23, Issue 6 - Dec 2010
Volume 23, Issue 5 - Oct 2010
Volume 23, Issue 4 - Aug 2010
Volume 23, Issue 3 - Jun 2010
Volume 23, Issue 2 - Apr 2010
Volume 23, Issue 1 - Feb 2010
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Analysis of Low Velocity Impact on Biomimetic Composites Mimicking Nacre
Jo, Seung-Un ; Beom, Hyeon-Gyu ;
Composites Research, volume 23, issue 4, 2010, Pages 1~6
DOI : 10.7234/kscm.2010.23.4.001
The dynamicresponse of biomimetic composites mimicking nacre under low velocity impact is investigated. The composites have hierarchical structures with a staggered pattern consisting of a protein and a mineral. To analyze the impact response of the composites, the finite element method is used. The effects of the hierarchical structures of the compositeson the dynamic response are examined. It is shown that the maximum stress, displacement and contact force in the composite subjected to low velocity impact decrease as the level of structural hierarchy increases.
Volume Integral Equation Method for Multiple Anisotropic Inclusion Problems in an Infinite Solid under Uniaxial Tension
Lee, Jung-Ki ;
Composites Research, volume 23, issue 4, 2010, Pages 7~13
DOI : 10.7234/kscm.2010.23.4.007
A volume integral equation method (VIEM) is introduced for the solution of elastostatic problems in an unbounded isotropic elastic solids containing interacting multiple anisotropic inclusions subject to remote uniaxial tension. The method is applied to two-dimensional problems involving long parallel cylindrical inclusions. A detailed analysis of stress field at the interface between the matrix and the central inclusion is carried out for square and hexagonal packing of the inclusions. Effects of the number of anisotropic inclusions and various fiber volume fractions on the stress field at the interface between the matrix and the central inclusion are also investigated in detail. The accuracy of the method is validated by solving the single inclusion problem for which solutions are available in the literature.
Optimal Design of Filament Wound Composite Cylinders under External Hydrostatic Pressure using a Micro-Genetic Algorithm
Moon, Chul-Jin ; Kweon, Jin-Hwe ; Choi, Jin-Ho ;
Composites Research, volume 23, issue 4, 2010, Pages 14~20
DOI : 10.7234/kscm.2010.23.4.014
In this study, a micro-genetic algorithm was utilized for the optimal design of filament wound composite cylinders subjected to hydrostatic pressure for underwater vehicle application. The objective of the optimization was to maximize the design allowable load considering the buckling and static failure loads. A commercial finite element program, MSC.NASTRAN, was used for buckling and failure analysis. An open-source micro genetic algorithm by Carroll was modified for the optimization. The design variables are the helical winding angle and hoop layer thickness. The results of examples show that the micro genetic algorithm can be successfully applied to the optimization of filament wound cylinders with various geometries and gives better efficiency than general genetic algorithms.
Mixed-Mode Fatigue Characteristics of Composite/Metal Interfaces
Baek, Sang-Ho ; Kim, Won-Seock ; Jang, Chang-Jae ; Lee, Jung-Ju ;
Composites Research, volume 23, issue 4, 2010, Pages 21~27
DOI : 10.7234/kscm.2010.23.4.021
In most engineering structures, fracture often takes place due to fatigue. Therefore, many studies about the effect of the various mode-mixities on fatigue characteristics have been performed. However, most of the former studies only address metal/metal interfaces or delamination of composite. In this study, the fatigue characteristics of composite/metal interfaces are investigated. The fatigue tests were performed using single leg bending(SLB)specimens that comprise composite and steel bonded to each other using co-cure bonding method. This paper focuses on fatigue characteristics depending on different mode ratios
. The overall results obtained in this study show that the crack propagation rate increases with the mode II loading component.
Study on Axial Crushing Behaviors of UD Kevlar/Epoxy with Different Trigger Models
Kim, Hyung-Uk ; Kim, Jung-Seok ; Jung, Hyun-Seung ; Yoon, Hyuk-Jin ; Kwon, Tae-Soo ;
Composites Research, volume 23, issue 4, 2010, Pages 28~34
DOI : 10.7234/kscm.2010.23.4.028
In this paper, in order to develop a realistic trigger model for a unidirectional Kevlar/Epoxy tube, the numerical model has been established and then verified by comparison with the experimental result. To achieve this goal, four different trigger models were candidated and evaluated using the commercial explicit FE code LS-DYNA. In the finite element analysis, the 2D shell element and Chang-Chang failure criterion was used. Mechanical material properties for the model were obtained by material testing in advance. The numerical results were compared with quasi-static test results under axial compressive loading at 10mm/min. The load-crushed displacement curves were very close to the experiments and SEA (specific energy absorption) showed a good agreement with experimental one within less than 5%.
Development of Hybrid Fiber-reinforced High Strength Lightweight Cementitious Composite
Bang, Jin-Wook ; Kim, Jung-Su ; Lee, Bang-Yeon ; Jang, Young-Il ; Kim, Yun-Yong ;
Composites Research, volume 23, issue 4, 2010, Pages 35~43
DOI : 10.7234/kscm.2010.23.4.035
The purpose of this paper is to develop a Hybrid Fiber-reinforced High Strength Lightweight Cementitious Composite (HFSLCC) incorporated with lightweight filler and hybrid fibers for lightness and high ductility. Optimal ingredients and mixture proportion were determined on the basis of the micromechanical analysis and the steady-state cracking theory considering the fracture characteristics of matrix and the interfacial properties between fibers and matrix. Then 4 mixture proportions were determined according to the type and amount of fibers and the experiment was performed to evaluate the mechanical performance of those. The HFSLCC showed 3% of tensile strain, 4.2MPa of ultimate tensile stress, 57MPa of compressive strength and
of bulk density. The mechanical performance of HFSLCC incorporated with PVA fibers of 1.0 Vol.% and PE fibers of 0.5 Vol.% is similar to those of the HFSLCC incorporated with fibers of 2.0 Vol.%.
Structural Behavior of the Reinforced Concrete Filled GFRP Tube
Lee, Seung-Sik ; Joo, Hyung-Joong ; Kang, In-Kyu ; Yoon, Soon-Jong ;
Composites Research, volume 23, issue 4, 2010, Pages 44~51
DOI : 10.7234/kscm.2010.23.4.044
Recently, to solve the problems associated with the neutralization and corrosion of reinforced concrete compression members, the structural configurations such as CFFT (Concrete Filled GFRP Tube) and RCFFT (Reinforced Concrete Filled GFRR Tube) have been developed and applied to main members of civil engineering structure. These members can increase structural performance in terms of structural stability, ductility as well as chemical resistance compared with conventional concrete structural members. Many researches in numerous institutions to predict the load carrying capacity of the concrete compression member strengthened with FRP materials have been conducted and they have been suggested an equation for the prediction of the load carrying capacity of the members. Through the review of the research results, it was found that their results are similar each other. Moreover, it was also found that the results are not directly applicable to our specimens since the results are largely depended upon the member configurations. Also, since the accurate design criteria for the RC members strengthened with FRP such as RCFFT have not been established properly, relevant theoretical and experimental investigations must be conducted for the application to the practical structures. In this study, structural behavior of RCFFT was evaluated through compressive and quasi-static flexural tests in order to formulate design criteria for the structural design. In addition, the RCFFT members were also investigated to examine their confinement effect and the equations capable of estimating the compressive ultimate strength and flexural stiffness of the RCFFT members were proposed.