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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 19, Issue 6 - Dec 2006
Volume 19, Issue 5 - Oct 2006
Volume 19, Issue 4 - Aug 2006
Volume 19, Issue 3 - Jun 2006
Volume 19, Issue 2 - Apr 2006
Volume 19, Issue 1 - Feb 2006
Selecting the target year
Direct Numerical Simulation of Composite laminates Under low velocity Impact
Ji, Kuk-Hyun ; Kim, Seung-Jo ;
Composites Research, volume 19, issue 1, 2006, Pages 1~8
Prediction of damage caused by low-velocity impact in laminated composite plate is an important problem faced by designers using composites. Not only the inplane stresses but also the interlaminar normal and shear stresses playa role in estimating the damage caused. But it is well known that the conventional approach based on the homogenization has the limit in description of damage. The work reported here is an effort in getting better predictions of dynamic behavior and damage in composite plate using DNS approach. In the DNS model, we discretize the composite plates through separate modeling of fiber and matrix for the local microscopic analysis. In the view of microscopic mechanics with DNS model, interlaminar stress behaviors in the inside of composite materials are investigated and compared with the results of the homogenized model which has been used in the conventional approach to impact analysis. Also the multiscale model based on DNS concept is developed in order to enhance the effectiveness of impact analysis, and we present the results of multiscale analysis considering micro and macro structures simultaneously.
Evaluation on Adiabatic Property for Vehicular Sandwich Composite Structure
Lee Sang Jin ; Oh Kyung Won ; Jeong Jong Cheol ; Kong Chang duk ; Kim Jeong Seok ; Cho Se Hyun ;
Composites Research, volume 19, issue 1, 2006, Pages 9~14
Experimental investigation on heat transfer ratio was firstly performed with three types of sandwich panels such as the Carbon/Epoxy Skin-Aluminum Honeycomb and Balsa Core Sandwich Panel of 37mm thickness, the Carbon/Epoxy Aluminum Skin-Honeycomb Core Sandwich Panel of 57mm thickness (including insulator) and the Carbon/Epoxy Skin-Aluminum Honeycomb Core Sandwich Panel of 37mm thickness based on the KS F 2278:2003(Insulation test method of windows). In additional to this investigation, experimental tests were also done for evaluation of heat transportation ratio with the Aluminum Skin- Aluminium Honeycomb Sandwich Panels of 27mm and 35mm thickness, and Aluminum Skin-Foaming Aluminum Sandwich Panel of 27mm thickness by the KS F2277:2002 (Insulation measuring method of construction component-Calibration heat box method or protective heat box method). In this study, it was found that the larger net heat transfer cross sectional area between the skin and the sandwich core is given, the higher heat transportation ratio occurs. It was also found that the hybrid type insulation had better insulation characteristics compared to the non-hybrid type insulation.
Development of a Thermoplastic Composite Parabolic Antenna Reflector using Automated Fiber Placement Method
Kim, Jin-Bong ; Kim, Tae-Wook ;
Composites Research, volume 19, issue 1, 2006, Pages 15~21
It is very difficult to make complex 3 dimensional curved-shape composite laminates using the advanced unidirectional composite prepregs. This study shows development process of subscale composite parabolic antenna reflector using unidirectional AS4/PEEK prepreg tapes. The AS4/PEEK thermoplastic composite materials are known to have good thermal and chemical stabilities in addition to their high specific strength and modulus. Various lamination methods were investigated through finite element analyses to make up the laminate design of the reflector. The automated fiber placement method was used to fabricate the reflector. The thermal expansion test using full-bridge strain gage circuits was done to verity the performance of the composite product.
Cycling life prediction method considering compressive residual stress on liner for the filament-wound composite cylinders with metal liner
Park, Ji-Sang ; Jeung, Sang-Su ; Chung, Jae-Han ;
Composites Research, volume 19, issue 1, 2006, Pages 22~28
In manufacturing process of composite cylinders with metal liner, the autofrettage process which induces compressive residual stress on the liner to improve cycling life can be applied. In this study, a finite element analysis technique is presented, which can predict accurately the compressive residual stress on the liner induced by autofrettage and stress behavior after. Material and geometrical non-linearity is considered in the finite element analysis, and the Von-Mises stress of a liner is introduced as a key parameter that determines pressure cycling life of composite cylinders. Presented methodology is verified through fatigue test of liner material and pressure cycling test of composite cylinders.
Fabrication of Radar Absorbing Shells Made of Hybrid Composites and Evaluation of Radar Cross Section
Jung, Woo-Kyun ; Ahn, Sung-Hoon ; Ahn, Bierng-Chearl ; Park, Seoung-Bae ; Won, Myung-Shik ;
Composites Research, volume 19, issue 1, 2006, Pages 29~35
The avoidance of enemy's radar detection is very important issue in the modem electronic weapon system. Researchers have studied to minimize reflected signals of radar. In this research, two types of radar absorbing structure (RAS), 'C'-type shell and 'U'-type shell, were fabricated using fiber-reinforced composite materials and their radar cross section (RCS) were evaluated. The absorption layer was composed of glass fiber reinforced epoxy and nano size carbon-black, and the reflection layer was fabricated with carbon fiber reinforced epoxy. During their manufacturing process, undesired thermal deformation (so called spring-back) was observed. In order to reduce spring-back, the bending angle of mold was controlled by a series of experiments. The spring-back of parts fabricated by using compensated mold was predicted by finite element analysis (ANSYS). The RCS of RAS shells were measured by compact range and predicted by physical optics method. The measured RCS data was well matched with the predicted data.
Microstructure and Electromagnetic Characteristics of MWNT-filled Plain-Weave Glass/Epoxy Composites
Lee, Sang-Eui ; Park, Ki-Yeon ; Lee, Won-Jun ; Kim, Chun-Gon ; Han, Jae-Hung ;
Composites Research, volume 19, issue 1, 2006, Pages 36~42
MWNT(multi-walled carbon nanotube)-filled plain-weave glass/epoxy composites were fabricated and electromagnetic characteristics of the composites were investigated. The observation of the microstructures of the composites revealed that MWNTs are mostly distributed in matrix rich region and the interface between glass fiber yarns in warp and fill direction. The permittivity of the composites, measured in X-band (8.2-12.4 GHz) frequency range, increased with weight fraction of MWNTs and remained almost constant with frequency. The measured permittivity was used to investigate the reflection loss of radar absorbing structures (RAS) composed of MWNT-filled composites according to thickness and a RAS were constructed with 10 dB absorbing bandwidth 4.2 GHz and 3.3 mm in thickness.
High Performance Fiber Reinforced Cement Composites in Construction Field
Hong, Geon-Ho ; Kim, Ki-Soo ; Han, Bog-Kyu ;
Composites Research, volume 19, issue 1, 2006, Pages 43~48
High performance fiber reinforced cement composites have better performances than traditional cement based materials, therefore, have been expected as new construction applications such as the materials for construction & bridge structure, repair and rehabilitation applications, anti-collapse applications, anti-noise applications etc. However, they have lots of the problems such as material design, fabrication method and structural analysis. Also, the most serious problems of High performance fiber reinforced cement composites have been expensive initial cost, lack of long-term exposure data. As a result, it is needed that the efforts for lowering the initial cost and accumulation of long-term exposure. There has been hardly assessment results of life cycle cost for HPFRCC in construction field, but some papers showed that total life cycle cost could be profitable if the initial cost could be reduced.