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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 15, Issue 6 - Dec 2002
Volume 15, Issue 5 - Oct 2002
Volume 15, Issue 4 - Aug 2002
Volume 15, Issue 3 - Jun 2002
Volume 15, Issue 2 - Apr 2002
Volume 15, Issue 1 - Feb 2002
Selecting the target year
Evaluation of AR Characteristics on Microscopic Fracture Mechanism of A17075/CERP Hybrid Composite
Composites Research, volume 15, issue 5, 2002, Pages 1~6
When compared to other composite materials such as FRP and MMC, hybrid composite material is more attractive one due to the high specific strength and the resistance to fatigue. However, the fracture mechanism of hybrid composite material is extremely complicated because of the bonding structure of metals and FRP. Recently, nondestructive technique has been used to evaluate the fracture mechanism of these composite materials. In this study. AE technique has been used to clarify the fracture mechanism and the degree of damage for Al 7075/CFRP hybrid composite material. It was found that AE event, energy and amplitude among AE parameters were effective to evaluate fracture process of Al 7075/CFRP composite material. In addition, the relationship between the AE signal and the characteristics of failure surface using optical microscope was discussed.
Reconstruction of Damage-Induced Impact Force of Gr/Ep Composite Laminates Using Piezoelectric Thin Film Sensor Signals
Composites Research, volume 15, issue 5, 2002, Pages 7~13
The piezoelectric thin film sensor has good characteristics to observe the impact responses of composite structures. The capabilities for monitoring impact behavior of Gr/Ep laminates subjected to damage-induced impact using the PVDF(polyvinylidene fluoride) film sensor were examined. For a series of low-velocity impact tests from low energy to damage-induced energy, simulated sensor signals were compared with measured signals and the PVDF film sensor. Local impact damages(matrix cracking and delamination) were found at three impact tests, but the measured signals agreed well with the simulated sensor signals based on the linear relationship between the impact forces and the PVDF film sensor signals. And the inverse technique was applied to reconstruct the impact forces using the PVDF film sensor signals. Most of reconstructed impact forces had good agreement with the measured forces. The comparison results showed that the local damage due. to low-velocity impact didn't disturb the global impact responses of composite laminates and the reconstruction of impact forces from PVDF sensor signals wasn't affected by the local damage.
Determination of Elastic Work Factor of Graphite/Epoxy Composites Subjected to Compressive Loading under Hydrostatic Pressure Environment
Composites Research, volume 15, issue 5, 2002, Pages 14~18
In the present study, we investigated the effects or hydrostatic pressure and stacking sequence on the elastic work factor to determine compressive fracture toughness of graphite/epoxy laminated composites in the hydrostatic pressure environment. The stacking sequences used were unidirectional.
. The hydrostatic pressures applied for a
case were 0.1 MPa, 70MPa, 140MPa. and 200MPa. The hydrostatic pressures applied for a
case were 0.1MPa, 100MPa, 200MPa, and 300MPa. It was found that the elastic work factor was not affected by the hydrostatic pressure and the stacking sequence. Also, it was found that the elastic work factor decreased in a linear fashion with delamination length.
Detection of Real Defects in Composite Structures by Laser Measuring System
Composites Research, volume 15, issue 5, 2002, Pages 19~26
Real defects in composite structures were detected by using laser measuring system. Four types of real defects, that is, impact-induced delamination in a composite laminate, debond in a honeycomb structure, free-edge delamination in a composite laminate and debond in an adhesive joint, were made by applying several types of loads to the specimens. Laser measuring system such as ESPI and shearography technique were used to detect those defects. Thermal loading method, which can easily induce the surface deformation of specimen, was used to detect the defects. Experimental results show that the defects in composite structures could be easily detected by ESPI and shearography technique. Moreover, it shows that ESPI and shearography technique could be usefully applied to the detection of defects in various kinds of composite structures.
Effective Thermal Conductivities of CE3327 Plain-weave Fabric Composite
Composites Research, volume 15, issue 5, 2002, Pages 27~34
The purpose of this study is to measure and predict the thermal conductivity of CF3327 plain-weave fabric composite made by Hankuk Fiber, Co. An experiment apparatus based on the comparative method has been made to measure the thermal conductivities of the composite material. Its accuracy was proved by measuring the thermal conductivity of graphite which is well-known. Micro-mechanical approaches are useful to assess the effect of parameters such as fiber and matrix material properties, fiber volume fraction and fabric geometric parameters on the effective material properties of composites. In this study, prediction was based on the concept of three dimensional series-parallel thermal resistance network. Thermal resistance network was applied to unit ceil model that characterized the periodically repeated pattern of a plain weave. The numerical results were compared with experimental one and good agreement was observed. Also, the effects of fiber volume fraction on the thermal conductivity of several composites has been investigated.
Elastic Buckling of Transversely Isotropic Plate with Variable Width
Yoon, S.J. ; Jung, J.H. ;
Composites Research, volume 15, issue 5, 2002, Pages 35~43
Presented in this paper are the results of an analytical investigation pertaining to the elastic buckling behavior of transversely isotropic plate with variable width subjected to unequal uniaxial compression forces at the ends and in-plane shear forces at the sides. The existing analytical solution developed for the isotropic plates is extended so that the transversely isotropic material properties can be taken into account in the plate buckling analyses. For the derivation of buckling equation the power series solution is employed. Graphical forms of results for finding the buckling strength of tapered plates are presented. In addition, the finite element analysis is also conducted. The results are compared and discussed.
State-of-the-art of the multi-scale analysis of advanced composite materials by homogenization method
Takano, Naoki ;
Composites Research, volume 15, issue 5, 2002, Pages 44~52
To study numerically the mechanical behaviors of advanced composite materials considering the microscopic phenomena as well as the macroscopic properties and behaviors, a multi-scale modeling and analysis by the mathematical homogenization method with the help of the finite element method(FEM) are reviewed. The hierarchical modeling strategy and the formulation are briefly described first to give some idea of the multi-scale framework. The latter half of this article focuses on the verification of the multi-scale analysis by the homogenization method in its applications to real advanced materials. The first example is the verification of the predicted macroscopic(homogenized) properties based on the microstructure of porous ceramics. In spite of the complexity of the random microstructure, the error between the predicted and the measured values was only 1%. Next, two applications to the process simulation of fiber reinforced polymer matrix composites are presented. The permeability characteristics are evaluated for sheared weave fabrics for resin transfer molding(RTM) simulation, and the thermoforming of FRTP sheet is analyzed considering the large deformation of the knit structure during the deep-draw forming was verified by comparison with the experimental results.
초고온 탄소복합재료의 현황과 전망
Composites Research, volume 15, issue 5, 2002, Pages 53~65
철도차량 시스템에서의 복합재료 응용
Composites Research, volume 15, issue 5, 2002, Pages 66~71