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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal DOI :
The Korean Society for Composite Materials
Editor in Chief :
Volume & Issues
Volume 26, Issue 6 - Dec 2013
Volume 26, Issue 5 - Oct 2013
Volume 26, Issue 4 - Sep 2013
Volume 26, Issue 3 - Jun 2013
Volume 26, Issue 2 - Apr 2013
Volume 26, Issue 1 - Feb 2013
Selecting the target year
A Study on Prediction of Fatigue Damage Crack Growth for Stiffener Bonded Composite Laminate Panel
Kwon, Jung-Ho ; Jeong, Seong-Moon ;
Composites Research, volume 26, issue 2, 2013, Pages 79~84
DOI : 10.7234/composres.2013.26.2.079
The prediction and analysis procedure of fatigue damage crack growth life for a stiffener bonded composite laminate panel including center hole and edge notch damage, was studied. It was performed on the basis of fatigue damage growth test results on a laminated skin panel specimens and the analysis results of stress intensity factor for the stiffener bonded composite panel. According to the comparison between experimental test and prediction results of fatigue damage growth life, it was concluded that the residual strength and damage tolerance assessment can be carried out along to the edge notch crack growth.
Experimental Testing of Curved Aluminum Honeycomb/CFRP Sandwich Panels
Roy, Rene ; Park, Yong-Bin ; Kweon, Jin-Hwe ; Choi, Jin-Ho ;
Composites Research, volume 26, issue 2, 2013, Pages 85~90
DOI : 10.7234/composres.2013.26.2.085
This paper presents the fabrication and 3-point flexion testing of carbon fiber reinforced polymer (CFRP) composite face/aluminum honeycomb core sandwich panels. Specimen sandwich panels were fabricated with three honeycomb types (3.18 mm, 4.76 mm, and 6.35 mm cell size) and three panel radii (flat, r = 1.6 m, r = 1.3 m). The curved sandwiches were fabricated normally with the core in the W-direction. The tensile mechanical properties of the CFRP
twill fabric face laminate were evaluated (modulus, strength, Poisson's ratio). The measured values are comparable to other CFRP fabric laminates. The flat sandwich 3-point flexion test core shear strength results were 11-30% lower than the manufacturer published data; the test set-up used may be the cause. With a limited sample size, the 1.3 meter panel curvature appeared to cause a 0.8-3.8% reduction in ultimate core shear strength compared to a flat panel.
Strength Analysis of Composite Double-lap Bolted Joints by Progressive Failure Theory Based on Damage Variables
Kim, Sang-Kuk ; Kweon, Jin-Hwe ;
Composites Research, volume 26, issue 2, 2013, Pages 91~98
DOI : 10.7234/composres.2013.26.2.091
A three-dimensional finite analysis method was proposed to predict the failure of composite double-lap bolted joints, which is based on the stiffness degradation method using damage variables and Hashin's three-dimensional failure criteria. Ladeveze's theory using damage variables to consider the matrix/shear damage was combined with stiffness degradation in fiber direction. Four different failure modes were considered including matrix compression/shear, matrix tension/shear, fiber compression, and tension failures. The friction between bolt and composite and the clamping force were considered using a commercial finite element software ABAQUS. The damage model was incorporated using the user-defined subroutine of the software. The predicted result was verified with the existing test result for bearing tension double shear and showed the deviation ranging 7~16% from test results.
Fabrication and Evaluation of Composite Panel with L-shaped Stiffeners
Yun, Jong-Hwa ; Choi, Jin-Ho ; Kweon, Jin-Hwe ;
Composites Research, volume 26, issue 2, 2013, Pages 99~104
DOI : 10.7234/composres.2013.26.2.099
The design of composite joint is important research area because they are often the weakest areas in composite structures. In this paper, the specimens with three paste thickness (0.2 mm, 0.6 mm, 4 mm) were manufactured in secondary bonding method and tested in two different loading direction condition. Also, the failure index of the L-type stiffener was calculated by the finite element method and compared with experimental results.
Performance Enhancement of Floating PV Generation Structure Using FRP
Choi, Jin-Woo ; Joo, Hyung-Joong ; Nam, Jeong-Hun ; Hwang, Seong-Tae ; Yoon, Soon-Jong ;
Composites Research, volume 26, issue 2, 2013, Pages 105~110
DOI : 10.7234/composres.2013.26.2.105
In this study, we suggest the new floating PV generation structure which is improved the structural and economical efficiency compared with the system developed in the previous research. Pultruded FRP has superior physical and chemical material properties compared with those of conventional structural materials. Especially, pultruded FRP has an excellent corrosion-resistance, light-weight, and it also has high specific strength and stiffness which are highly appreciated for the design and fabrication of floating PV generation structure under harsh environmental condition. In this study, structural analysis using the finite element method has been performed to investigate the safety of new floating PV generation structure and newly applied structural members.
Mechanical Behavior of Al/C
Choi, Hyun-Joo ;
Composites Research, volume 26, issue 2, 2013, Pages 111~115
DOI : 10.7234/composres.2013.26.2.111
Aluminum-based composites containing
-fullerenes are produced by hot rolling of ball-milled powder. The grain size of aluminum is effectively reduced to ~100 nm during ball-milling processes, leading to grain refinement strengthening of the composite. Furthermore,
-fullerenes are gradually dispersed during ball-milling processes and hence the strength of the composite increases with the volume of
-fullerenes. The composite containing 10 vol%
-fullerenes with a grain size of ~ 100 nm exhibits ~1 GPa of compressive strength.
Low Velocity Impact Behavior of Aluminium and Glass-Fiber Honeycomb Structure
Kim, Jin Woo ; Won, Cheon ; Lee, Dong Woo ; Kim, Byung Sun ; Bae, Sung In ; Song, Jung Il ;
Composites Research, volume 26, issue 2, 2013, Pages 116~122
DOI : 10.7234/composres.2013.26.2.116
In this study, impact behavior of aluminium and glass-fiber structure is studied under low impact velocity. Compression test is carried out to investigate the compressive strength of the specimens. The degree of damage is observed using microscopy and compared with the experimental analysis data. The maximum load capacity, impact strength and elastic energy of glass-fiber honeycomb sandwich panel are more than the aluminium honeycomb sandwich panel.
The Effects of Post-Treatments for Wet Spun PVDF on the Piezoelectric Property
Yu, Seung Mi ; Oh, Hyun Ju ; Hwang, Sang-Kyun ; Chung, Yong Sik ; Hwang, Hui Yun ; Kim, Seong Su ;
Composites Research, volume 26, issue 2, 2013, Pages 123~128
DOI : 10.7234/composres.2013.26.2.123
The PVDF (polyvinylidene fluoride) fibers were prepared using the wet spinning processing. To improve
-phase crystalline which closely related piezoelectric property PVDF wet spun fibers conducted post treatment. Post treatment is consisted of heat stretching and annealing process. The heat stretching and annealing conditions were controlled by changing temperature between glass transition temperature and melting temperature. From these experimental data, the resulting crystal structure of the
-phase crystalline was confirmed by FT-IR and XRD experiments. From these analysis results, optimum stretching and annealing conditions of the wet spun PVDF fibers were founded to increase high
-phase crystalline. Furthermore results showed that thermal processing had a direct effect on modifying the crystalline microstructure and also confirmed that heat stretching and annealing could increase the degree of crystallinity and
-phase crystalline. Finally, piezoelectric constant (
) of the post heat treated PVDF fibers reinforced composite were measured to investigate the feasibility for the sensing materials.
The Effect of the Core-shell Structured Meta-aramid/Epoxy Nanofiber Mats on Interfacial Bonding Strength with an Epoxy Adhesive in Cryogenic Environments
Oh, Hyun Ju ; Kim, Seong Su ;
Composites Research, volume 26, issue 2, 2013, Pages 129~134
DOI : 10.7234/composres.2013.26.2.129
The strength of adhesive joints employed in composite structures under cryogenic environments, such as LNG tanks, is affected by thermal residual stress generated from the large temperature difference between the bonding process and the operating temperature. Aramid fibers are noted for their low coefficient of thermal expansion (CTE) and have been used to control the CTE of thermosetting resins. However, aramid composites exhibit poor adhesion between the fibers and the resin because the aramid fibers are chemically inert and contain insufficient functional groups. In this work, electrospun meta-aramid nanofiber-reinforced epoxy adhesive was fabricated to improve the interfacial bonding between the adhesive and the fibers under cryogenic temperatures. The CTE of the nanofiber-reinforced adhesives were measured, and the effect on the adhesion strength was investigated at single-lap joints under cryogenic temperatures. The fracture toughness of the adhesive joints was measured using a Double Cantilever Beam (DCB) test.
The Minimum Lap-spliced Length of the Reinforcement in the Steam Curing UHPC Bridge Deck Slab Joint
Hwang, Hoon-Hee ; Park, Sung-Yong ;
Composites Research, volume 26, issue 2, 2013, Pages 135~140
DOI : 10.7234/composres.2013.26.2.135
The static test was performed to verify the effect of the joint in the UHPC bridge deck slab and the minimum lap-spliced length was presented. A total of six test members was fabricated to estimate the static behavior of the steam curing UHPC bridge deck slab joint by the four points bending test method. The lap-spliced joint type was expected to be not only simple but also efficient in UHPC structure because of the high bond stress of UHPC. Test results show that the decrease of maximum flexural strength was about 30% and the minimum lap-spliced length which behaved similar to the continued reinforcement in strength and ductility was 150 mm.
Mode II Interlaminar Fracture Toughness of Hybrid Composites Inserted with Different Types of Non-woven Tissues
Jeong, Jong-Seol ; Cheong, Seong-Kyun ;
Composites Research, volume 26, issue 2, 2013, Pages 141~145
DOI : 10.7234/composres.2013.26.2.141
The mode II interlaminar fracture toughness was evaluated for CFRP laminates with different types of nonwoven tissues and the source of increased mode II interlaminar fracture toughness was examined by SEM analysis in this paper. The interlaminar fracture toughness in mode II is obtained by an end notched flexure test. The experiment is performed using three types of non-woven tissues: 8
of carbon tissue, 10
of glass tissue, and 8
of polyester tissue. On the basis of the specimen with no non-woven tissue, interlaminar fracture toughness on mode II at specimens inserted with non-woven carbon and glass tissues and polyester tissues increases as much as 166.5% and 137.1% and 157.4% respectively. The results show that mode II interlaminar fracture toughness of CFRP laminates inserted with nonwoven tissues increased due to the fiber bridging, fiber breakage, and hackle etc. by SEM analysis.