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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
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Rigidity and Vibration Analysis on Fiber-Reinforced Composite Corrugated Plates
Composites Research, volume 15, issue 4, 2002, Pages 1~8
In this study, the rigidities of fiber-reinforced composite corrugated plates are derived to achieve the weight reduction, high strength, and high stiffness. The vibration of the corrugated plates for all the conventional boundary conditions in the plates is analyzed numerically by applying the derived rigidities, and so the analysis system is programmed to obtain the results by using Visual Basic language. Consequently, the characteristics of fiber-reinforced composite corrugated plates can be easily investigated from the results provided by the programmed system.
A Study on the strength of mechanically fastened composite joint
Composites Research, volume 15, issue 4, 2002, Pages 9~16
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 area index method to predict the strength of the mechanically fastened composite joint which has the same stacking sequence was suggested and evaluated. By the suggested failure area index method, the strength of the mechanically fastened composite joint could be predicted within 6.03％.
A Development of Small-diameter Composite Helical Spring for Reinforcement of Optical Fiber Jumper Cord (OJC)
Composites Research, volume 15, issue 4, 2002, Pages 17~22
Small diameter composite helical springs (CS) are developed using a hot plated mold for reinforcement of common optical fiber jumper cord (OJC). The outer diameters of the springs are about 2 ~ 3mm. These springs are inserted into the OJC to protect the damage of an optical fiber from the sudden lateral load. Two types of CS, Yarn type (Y-type) and Band type (B-type), are manufactured to compare the effectiveness for the damage protection. The experimental works were conducted to check the effect of the CS covered around OJC on the mechanical and optical properties. Experimental observations show a considerable effect on the flexural resistance, hence slowing down the deterioration of the optical power by the internal damage of the fiber. Obtained main results are as follows: (1) Y-type CS has better protection abilities to lateral loading than B-types. (2) Compared with bare OJC, CS-OJC has less power loss under the loading. (3) OJC covered with the composite coil spring has a possibility for a practical usage with full fruits.
Two Dimensional Size Effect on the Compressive Strength of Composite Plates Considering Influence of an Anti-buckling Device
Composites Research, volume 15, issue 4, 2002, Pages 23~31
The two dimensional size effect of specimen gauge section (
) was investigated on the compressive behavior of a T300/924
, carbon fiber-epoxy laminate. A modified ICSTM compression test fixture was used together with an anti-buckling device to test 3mm thick specimens with a
gauge length by width section. In all cases failure was sudden and occurred mainly within the gauge length. Post failure examination suggests that
fiber microbuckling is the critical damage mechanism that causes final failure. This is the matrix dominated failure mode and its triggering depends very much on initial fiber waviness. It is suggested that manufacturing process and quality may play a significant role in determining the compressive strength. When the anti-buckling device was used on specimens, it was showed that the compressive strength with the device was slightly greater than that without the device due to surface friction between the specimen and the device by pretoque in bolts of the device. In the analysis result on influence of the anti-buckling device using the finite element method, it was found that the compressive strength with the anti-buckling device by loaded bolts was about 7% higher than actual compressive strength. Additionally, compressive tests on specimen with an open hole were performed. The local stress concentration arising from the hole dominates the strength of the laminate rather than the stresses in the bulk of the material. It is observed that the remote failure stress decreases with increasing hole size and specimen width but is generally well above the value one might predict from the elastic stress concentration factor. This suggests that the material is not ideally brittle and some stress relief occurs around the hole. X-ray radiography reveals that damage in the form of fiber microbuckling and delamination initiates at the edge of the hole at approximately 80% of the failure load and extends stably under increasing load before becoming unstable at a critical length of 2-3mm (depends on specimen geometry). This damage growth and failure are analysed by a linear cohesive zone model. Using the independently measured laminate parameters of unnotched compressive strength and in-plane fracture toughness the model predicts successfully the notched strength as a function of hole size and width.
Signal Characteristics of Fiber Brags Grating due to Internal Strain Gradient
Composites Research, volume 15, issue 4, 2002, Pages 32~36
Recently, the applications of composite materials become broader to civil engineering as well as mechanics and aerospace engineering. Cracks on the civil structures like bridges can cause stress concentration, which induces Peak splitting of fiber Bragg grating sensor and it makes strain measurements difficult. In this study, 4-point bending test of concrete beam with initial crack reinforced by composite patch was conducted in order to verify the effects of the stress concentration on the peak signal of FBG sensor and a novel method for signal maintenance.
The Crack Problem for Functionally Graded Piezoelectric Ceramic Strip
Composites Research, volume 15, issue 4, 2002, Pages 37~42
We consider the problem of determining the singular stresses and electric fields in a functionally graded piezoelectric ceramic strip containing a Griffith eccentric crack under anti-plane shear loading with the theory of linear piezoelectricity. Fourier transforms are used to reduce the problem to the solution of two pairs of dual integral equations, which are then expressed to a Fredholm integral equation of the second kind. Numerical values on the stress intensity factor and the energy release rate are obtained.
MIT의 복합재료 연구현황
Composites Research, volume 15, issue 4, 2002, Pages 43~48
This paper presents the brief description of Composite Materials Research carried out at Massachusetts Institute of Technology (MIT). The researches regarding Composites are performed at four Departments, they are Laboratory for Manufacturing ＆ Productivity (LMP) within Mechanical Engineering Department, Technology Laboratory for Advanced Composites (TELAC) within Aerospace Engineering Department, Structures & Materials Program within Civil & Environmental Engineering Department and Building Technology Program within Department of Architecture.