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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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Effect of Heat Treatment on Mechanical Properties of Cross-Linked Ultra-High Molecular Weight Polyethylene Used for Artificial Joint Liner
Kim, Hyun-Mook ; Kim, Dong-Hoon ; Gu, Ja-Uk ; Choi, Nak-Sam ; Kim, Sung-Kon ;
Composites Research, volume 22, issue 2, 2009, Pages 1~6
The mechanical characteristics of gamma-ray irradiated UHMWPE specimens were investigated under various heat treatment conditions. The heat treatment was performed in the range of annealing and remelting temperatures. The annealing treatment below the temperature of
hardly induced changes in the tensile strength, the strain at the failure and the hardness. However the remelting treatment above
deteriorated those mechanical properties. It was shown in an FTIR analysis that the annealing treatment caused some oxidation of free radicals created by the pretreatment of the irradiation. These quantitative data represented by the behavior of mechanical properties might be used as basic informations for the design and analysis of various artificial joints.
A Study on Failure Strength of the Hybrid Composite Joint
Lee, Young-Hwan ; Park, Jae-Hyun ; Ahn, Jeoung-Hee ; Choi, Jin-Ho ; Kweon, Jin-Hwe ;
Composites Research, volume 22, issue 2, 2009, Pages 7~13
With the wide application of fiber-reinforced composite material in aero-structures and mechanical parts, the design of composite joint have become a very important research area because they are often the weakest areas in composite structures. In this paper, the failure strengths of the hybrid composite joints which were composed of a combination of an adhesive joint and a mechanical joint were evaluated and predicted. The 10 hybrid joint specimens which have different w/d, e/d and adherend thickness were manufactured and tested. The damage zone theory and the failure area index method were used for the failure prediction of the adhesive joint and the mechanical joint, respectively and the hybrid joints were assumed to be failures if either of the two failure criteria was satisfied. From the results of experiments and analyses, the failure strengths of the hybrid joints could be predicted to within 25.5%.
Experimental examination for effect of voids on bonding performance in cryogenic temperature condition
Shon, Min-Young ; Kim, Jong-Ho ; Kim, Jong-Hak ;
Composites Research, volume 22, issue 2, 2009, Pages 14~17
Adhesive joints are widely used for structural joining applications in various fields and environmental conditions. Polyurethane adhesive is using for LNG carrier with cryogenic temperature condition. In industrial application of polyurethane adhesive, void of adhesive layer is often discussed regarding its effects on bonding properties. In present study, artificial void were prepared on Polyurethane adhesive layer with various size and location. The single lap shear test was carried out by using prepared specimens under
. As a result, it was confirm that the void of adhesive layer didn't affect the adhesion properties independent of their size and location.
High Velocity Impact Analysis of Kevlar29/Phenolic Composite Plate
Ahn, Jeoung-Hee ; Kweon, Jin-Hwe ; Choi, Jin-Ho ;
Composites Research, volume 22, issue 2, 2009, Pages 18~23
Failure of Kevlar29/Phenolic composite plate under high velocity impact of FSP(Fragment Simulation Projectile) is investigated using a non-linear explicit finite element code, LS-DYNA. Composite laminate and impactor are idealized by solid element and interface between laminas are modeled by tied-break element in LS-DYNA. Interaction between impactor and laminate is simulated face-to-face eroding contact algorithm. When the stress level meets a failure criteria, the layer in the element is eroded. Numerical results are verified by existing test results.
A Study on Residual Strength of Carbon/Epoxy Face Sheet and Honeycomb Core Sandwich Composite Structure after Quasi Static Indentation Damage
Kong, Chang-Duk ; Park, Hyun-Bum ; Lee, Seoung-Hyun ;
Composites Research, volume 22, issue 2, 2009, Pages 24~29
This study aims to investigate the residual strength of sandwich composites with Al honeycomb core and carbon fiber face sheets after the quasi-static indentation damage by the experimental investigation. The 3-point bending test and the edge-wise compressive strength test were used to find the mechanical properties, and the quasi-static point load was applied to introduce the simulated damage on the specimen. The damaged specimens were finally assessed by the 3-point bending test and the compressive strength test. The investigation results revealed the residual strength of the damaged specimens due to the quasi-static indentation. The both test results showed that the residual strength of the damaged specimen was decreased according to increases of the damaged depth.
Study on design of the composite torque link for a landing gear system of a helicopter
Kim, Jin-Bong ; Um, Moon-Kwang ; Lee, Sang-Yong ; Kim, Tae-Uk ; Shin, Jeong-Woo ;
Composites Research, volume 22, issue 2, 2009, Pages 30~36
In this paper, we propose the design method for the composite torque link of a landing gear for a helicopter. The composite torque link has to be light weighted and very stiff to keep the shock absorber in the landing gear of helicopter. The configuration and structural shape has to be designed in consideration of the RTM (Resin Transfer Molding) manufacturing process which is adopted to minimize the manufacturing cost. The mechanical properties are obtained through the coupon tests with the specimens made by the same manufacturing process for the composite structure. The optimal design process was performed through iterative modifications of the models which were verified by stress analysis using FEM. The composite torque link has lug-shaped parts and is very thick, so 3D Layered solid elements of ABAQUS were used to get the stress field including the stress components in thickness direction and non-linear static analysis using contact B.C. of rigid-deform condition was used to get the optimal design.
Behavior of a Shape Memory Alloy Actuator with Composite Strip and Spring
Heo, Seok ; Hwang, Do-Yeon ; Choi, Jae-Won ; Park, Hoon-Cheol ; Goo, Nam-Seo ;
Composites Research, volume 22, issue 2, 2009, Pages 37~42
This paper presents an experimental approach to design a bending-type actuator by using a shape memory alloy wire (SMA), composite strip, and spring. The SMA wire is attached to two edges of the bent strip to apply pre-stress to the SMA wire. The spring is used to provide recovery force right after actuation of the SMA wire. To investigate thermo-mechanical characteristics of the SMA wire, a series of DSC tests have been conducted and tensile tests under various levels of pre-stress and input power have been performed. Based on the measured properties of the SMA wire, bending-type actuators are designed and tested for different combination of strip, number of springs, and input power. It has been found that a bending-type actuator with a proper combination shows fast actuation performance and low power consumption.
Interlaminar Fracture Toughness of CFRP Laminates with Carbon Non-Woven Tissue Having Different Weights
Cheong, Seong-Kyun ;
Composites Research, volume 22, issue 2, 2009, Pages 43~48
For the practical use of improved interlaminar fracture toughness by interleaving carbon non-woven tissue (CNWT), intelaminar fracture toughnesses of CFRP laminates with CNWT having different weights were experimentally investigated. A suitable weight of interleaved CNWT in CFRP laminates was discussed with Mode I and Mode II tests. Mode I and Mode II interlaminar fracture toughnesses (GIC and GIIC) were obtained by DCB and ENF tests. Six kinds of specimens with CNWT were prepared. The weights of CNWT per square meter for six types of specimens are
, respectively. The mean GIC and GIIC values of six kinds of specimens were not substantially different from one another. Compared with the CFRP specimen, the mean GIC values of six kinds of specimens were slightly decreased. But the mean GIIC values increased tremendously at least twice by interleaving CNWT. It seems that there is no interrelationship between the interlaminar fracture toughnesses (GIC and GIIC) and the interleaving CNWT weights. Consequently, it would be desirable to use the CNWT of
among the six kinds of CNWTs to take advantage of the interlaminar fracture toughness improved by interleaving CNWT, because the CNWT of
is a lightweight and low-priced material.