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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 23, Issue 6 - Dec 2010
Volume 23, Issue 5 - Oct 2010
Volume 23, Issue 4 - Aug 2010
Volume 23, Issue 3 - Jun 2010
Volume 23, Issue 2 - Apr 2010
Volume 23, Issue 1 - Feb 2010
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Improvement of Electrical Conductivity of Carbon-Fiber Reinforced Plastics by Nano-particles Coating
Seo, Seong-Wook ; Ha, Min-Seok ; Kwon, Oh-Yang ; Cho, Heung-Soap ;
Composites Research, volume 23, issue 6, 2010, Pages 1~6
DOI : 10.7234/kscm.2010.23.6.001
The electrical conductivity of carbon-fiber reinforced plastics (CFRP's) has been improved by indium-tin oxide (ITO) nano-particle coating on carbon fibers for the purpose of lightning strike protection of composite fuselage skins. ITO nano-particles were coated on the surface of carbon fibers by spraying the colloidal suspension with 10~40% ITO content. The electrical conductivity of the CFRP has been increased more than three times after ITO coating, comparable to or higher than that of B-787 composite fuselage skins with metal wire-meshes on the outer surface, without sacrificing the tensile property due to the existence of nano-particles at fiber-matrix interface. The damage area by the simulated lightning strike was also verified for different materials and conditions by using ultrasonic C-scan image. As the electrical conductivity of 40% nano-ITO coated sample surpass that of the B-787 sample, the damage area by lightning strike also appeared comparable to that of the materials currently employed for composite fuselage construction.
A Study on Analysis Method to Evaluate Influence of Damage on Composite Layer in Type3 Composite Cylinder
Lee, Kyo-Min ; Park, Ji-Sang ; Lee, Hak-Gu ; Kim, Yeong-Seop ;
Composites Research, volume 23, issue 6, 2010, Pages 7~13
DOI : 10.7234/kscm.2010.23.6.007
Type3 cylinder is a composite pressure vessel fully over-wrapped with carbon/epoxy composite layers over an aluminum liner, which is the most ideal and safe high pressure gas container for CNG vehicles due to the lightweight and the leakage-before-burst characteristics. During service in CNG vehicle, if a fiber cut damage occurs in outer composite layers, it can degrade structural performance, reducing cycling life from the original design life. In this study, finite element modeling and analysis technique for the composite cylinder with fiber-cut crack damage is presented. Because FE analysis of type3 cylinder is path dependant due to plastic deformation of aluminum liner in autofrettage process, method to introduce a crack into FE model affect analysis result. A crack should be introduced after autofrettage in analysis step considering real circumstances where crack occurs during usage in service. For realistic simulation of this situation, FE modeling and analysis technique introducing a crack in the middle of analysis step is presented and the results are compared with usual FE analysis which has initial crack in the model from the beginning of analysis. Proposed analysis technique can be used effectively in the evaluation of influence of damage on composite layers of type3 cylinder and establish inspection criteria of composite cylinder in service.
Hypervelocity Impact Analysis Of Composite Plate For Space Shielding System
Son, Yu-Na ; Moon, Jin-Bum ; Lim, Gun ; Kim, Chun-Gon ;
Composites Research, volume 23, issue 6, 2010, Pages 14~18
DOI : 10.7234/kscm.2010.23.6.014
Among the factors that threaten spacecraft, Micrometeoroid and Orbital Space Debris(MMOD) cause damage to spacecraft and impact velocity is about 8~70km/s. Nowadays, various Whipple Shield are studied and applied to protect spacecraft. As the materials used to Shielding System, aluminum is usually used but composite is also used increasingly. So this study compared characteristics of hypervelocity impact of Aluminum and composites through finite element analysis. The Projectile was a spherical shape using Aluminum 2017-T4, and aluminum plate was using Aluminum 6061-T6, CFRP plate was using T300/5208. Initial impact velocity of projectile was 1km/s. As a result, kinematic energy of projectile decreased to about 64J and about 63J for aluminum plate and CFRP plate, respectively after impact. Although both results is almost same about the absorption of impact energy, you can think the CFRP has good ballistic characteristic, because CFRP is lighter about 1.7 times compared with density of aluminum.
A Study on Optimum Design Analysis of Bolt Locations for Metal Joint Parts of Railway Composite Bogie Frames using Sub-modeling Method
Kim, Jun-Hwan ; Shin, Kwang-Bok ; Ko, Hee-Young ; Kim, Jung-Seok ;
Composites Research, volume 23, issue 6, 2010, Pages 19~25
DOI : 10.7234/kscm.2010.23.6.019
This paper describes the optimum design of bolt locations for metal joint parts of railway bogie frame made of glass fiber/epoxy 4-harness satin woven laminate composite and PVC foam core. The optimum design analysis was done by sub-problem approximation method using Ansys Parameter Design Language(APDL). The sub-modeling method was introduced to conduct the detailed recalculation for the only target parts and reduce calculating time. The structural analysis for composite bogie frame was performed according to JIS E 4207. The results showed that the optimum design analysis using sub-modeling method was able to obtain faster and more precise results than that of the entire model by the control of mesh size for the target parts, and the maximum Von-Mises stress has been reduced in comparison with its original dimensions due to the optimum design of bolt locations.
An Experimental Study on Fatigue Durability for Composite Torque Link of Helicopter Landing Gear
Kwon, Jung-Ho ; Kang, Dae-Hwan ;
Composites Research, volume 23, issue 6, 2010, Pages 26~31
DOI : 10.7234/kscm.2010.23.6.026
This research work contributes to a study for the procedure and methodology to assess the fatigue durability for a composite torque link for helicopter landing gear, which was newly developed and fabricated by the resin transfer moulding technique to interchange with metal component. The simulated load spectrum anticipated to be applied to the torque link during its operation life was generated using an advanced method of probabilistic random process, and the fatigue durability was evaluated by the residual strength degradation approach on the basis of material test data. The full scale fatigue test was performed and compared with the analysis results.
Adhesive Bonding Properties between NBR and Polyamide Woven Fabric with Atmospheric Pressure Plasma Treatment
Ryu, Sang-Ryeoul ; Lee, Dong-Joo ;
Composites Research, volume 23, issue 6, 2010, Pages 32~38
DOI : 10.7234/kscm.2010.23.6.032
The effect of the atmospheric pressure plasma(APP) treatments is experimentally investigated to ascertain the optimum condition to yield the best adhesive properties between a polyamide woven fabric and acrylonitrile butadiene rubber(NBR). For the atmospheric pressure flame plasma(APFP) treatment, the optimum number of treatment at given conditions is 2 times. The thermal deformation of the fabric is more serious with increasing the number of APFP treatment. The adhesive strength of the case with APFP treated fabric is increased about 35% when compare to the case with non-APFP treated one for the interface(bonding agent one or two coatings). When the surface is coated twice with the bonding agent, the adhesive energy with APFP treated fabric is increased about 4 times. It was found that the surface modification of polyamide woven fabric by APFP treatment is a fast, economic and applicable method to improve the adhesive properties between woven fabric and rubber when compared to other APP treatments.
Statistical Verification of Acoustic Emissions Detected during Polymerization Shrinkage of Resin Restoration in Dental Ring
Gu, Ja-Uk ; Choi, Nak-Sam ; Arakawa, Kazuo ;
Composites Research, volume 23, issue 6, 2010, Pages 39~46
DOI : 10.7234/kscm.2010.23.6.039
Acoustic emission (AE) signals are detected during the polymerization shrinkage of composite resin restoration in artificial dental ring according to various interfacial treatment conditions. AE amplitudes and the number of AE hit events were compared through the non-parametric statistics of Mann-Whitney method and Kruskal-Wallis method. The AE amplitudes detected from the PMMA and human tooth ring specimens were not significantly different according to adhesive conditions. The stainless steel ring specimen, meanwhile, had a difference in AE amplitude (p<0.05). The quantity of hit events for the human molar dentin specimens of the good bonding state was much less than that for the steel ring specimen but more than that for the PMMA ring specimen. For the same substrate, the better the bonding state, the less the AE hit events (p<0.05). The degree of marginal disintegration measured by SEM was proportional to the amount of AE hit events detected.
Thermal Vibration Characteristics of a Thin Walled Composite Beam attached on Spacecraft
Kim, Gyu-Sun ; Song, O-Seop ;
Composites Research, volume 23, issue 6, 2010, Pages 47~54
DOI : 10.7234/kscm.2010.23.6.047
Thermal vibration characteristics of a thin walled composite beam attached on spacecraft are investigated in this paper. The composite beam is assumed to have a thin CUS(circumferentially uniform stiffness) wall and modeled with several composite materials which are already space qualified such as T300/Epoxy, YS90AEpoxy. Steady state angle and peak to peak error in spacecraft attitude angle and tip displacement of composite beams are evaluated as a performance index for thermal vibration characteristics. Evaluation results shows that composite beam made out of YS90A has nearly 2 times better than T300 in terms of peak to peak attitude error angle.
A study on the forming condition of a bone plate made of a glass/polypropylene composite (Twintex)
Park, Seok-Won ; Yoo, Seong-Hwan ; Lee, Jae-Eung ; Chang, Seung-Hwan ;
Composites Research, volume 23, issue 6, 2010, Pages 55~60
DOI : 10.7234/kscm.2010.23.6.055
In this paper, tensile and bending tests of glass/polypropylene composite (Twintex) specimens fabricated by various forming conditions were carried out and the results were compared according to the forming conditions to find the appropriate condition for the forming composite bone plates. From the tests it was found that the most appropriate forming conditions were
, 3MPa. Composite bone plates were formed using this condition by two different fabricating methods for screw holes: one was a net shape molding and the other was drilling. The forming and bending tests revealed that the drilling process provided much better bending stiffness of bone plates. This paper provided the most appropriate condition for forming composite bone plates and this result was also expected to offer informative data on forming of other Twintex structures.
A study on the variation of in-plane and out-of-plane properties of T800 carbon/epoxy composites according to the forming pressure
Park, Myong-Gil ; Cho, Sung-Kyum ; Chang, Seung-Hwan ;
Composites Research, volume 23, issue 6, 2010, Pages 61~66
DOI : 10.7234/kscm.2010.23.6.061
In this paper, the variation of mechanical properties of T800 carbon/epoxy composites according to the forming pressure, which was referred to previous studies on a filament winding process, were investigated. The specimens of all the tests were fabricated by an autoclave de-gassing molding process controlling forming pressure (absolute pressures of 0.1MPa, 0.3MPa, 0.7MPa including vacuum) and water jet cutting after fabricating composite laminates. Various tensile tests were performed for in-plane properties and interlaminar properties were also measured by using Iosipescu test jig. Fiber volume fraction was measured to correlate the property variation and the forming pressure. This properties are expected to be utilized in the design of Type III pressure vessel for hydrogen vehicles which uses the same carbon fiber (T800 carbon fiber) for the filament winding process.