COMPOSITES SCIENCE AND ENGINEERING

THE FATIGUE ANALYSIS OF UAV COMPOSITE WING BASED ON ANSYS/FESAFE

Jiang, N. C., Xie, Q. W., Dai, Y., Zhang, Z. Q.

2009, 205(6): 3-4.

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The static strength of UAV composite wing has been computed. Meanwhile， the fatigue life of UAV composite wing has been analyzed based on ANSYS/FESAFE software. The rainflow method and fatigue damage cumulative theory have been applied to the formation of load spectrum. Further more， a new way of computing fatigue life of UAV composite wing has been provided.

TENSION STRENGTH AND SHEAR STRESS DISTRIBUTION OF GFRP STRENGTHENING CONCRETE BEAM

Ge, X. X., Zhang, D. H., Wang, L. M.

2009, 205(6): 5-11.

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To investigate the tension strength of glass fiber， axial tension experiments were

carried out for five specimens with or without impregnating compounds. The experiments indicated

that the epoxy resin could not only stick and protect glass fiber plates， but also increase its

tensile strength. To deeply understand mechanical behavior of GFRP strengthening concrete structure

， nine specimens were tested by beams′ fourpoint bending experiments. One of the specimens was

stick with strain gauges for tracking the failure process. Then， the damage process curves of the

experiments and strain values were obtained. Comparison with two kinds of experiments， axial

tension strength of glass fiber plates was greater than the strength of fourpoint bending test.

Through the test data of concrete beam with GFRP and mechanics model analysis， the axis force and

shear stress distribution of GFRP were analyzed respectively.

THE USING OF MALEK AND FLYNNWALLOZAWA EQUATION IN CURING REACTION
OF TDE85/MENA EPOXY RESIN SYSTEM

Guo, J. J., Sun, J. L., Ren, M. S., Bai, R. C.

2009, 205(6): 12-15.

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The kinetics of the cure reaction for a system of TDE85/MeNA epoxy resin was monitored

by the differential scanning calorimetry(DSC) and investigated by the constant heating methods.

According to the DSC graphs， the Tβ graph extrapolation was used to get the characteristic

curing process temperatures， and to confirm the technical parameters of the molding process of the

resin system. The kinetic parameters of the curing reaction of TDE85/MeNA epoxy resin such as the

overall activation energy Ea， the frequency factor A and the reaction equation were obtained， the

results were that : E=67.05kJ/mol， A=5.05×109s1.The curing reaction was calculated accurately by

using the correct kinetic model，and was set up by using Malek and FlynnWallOzawa equation. The

result of comparing the heating flow graph from the kinetic model and the examination was in harmony

， it illuminated that the kinetic model could be used to depict the curing reaction of the TDE

85/MeNA epoxy system.

FORCED RESPONSE ANALYSIS OF COMPOSITE MATERIAL BARREL

Xu, E. D., Q. L. F., C. L. M.

2009, 205(6): 16-18.

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In order to evaluate the dynamic property of composite material barrel， the forced

response analysis is conducted by using mode superposition method on the basis of modal analysis and

damping analysis. The muzzle vibration status of the composite material barrel is obtained and

compared with which of the steel barrel. The results show that the response amplitude and frequency

of composite material barrel is less than the response of steel barrel. The dynamic property of the

composite material barrel is much more excellent.

VARIATIONS OF MOISTURE ABSORPITION AND MECHANICAL PROPERTIES OF
DIFFERENT COMPOSITES WITH IMMERSION TIME IN WATER

Lei, W., S. C. Q., X. Y.

2009, 205(6): 19-24.

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Unsaturated polyester resin(UPR) is used as matrix， glass fiber cloth， ramie fiber cloth

and/or basic magnesium sulfated whisker are used as reinforcement to form composites by compression

molding process.The variations of moisture absorption and mechanical properties of different

composites with immersion time in water at 30℃ and 50℃ respectively were studied. The results show

that， the water uptakes of all the composites increase with immersion time in water， the

composites absorb water much fast from 0h to 8h， then relaxedly or unchanged.The water uptakes at

50℃ are always more than those at 30℃|the reinforcement of glass fiber cloth on UPR is far better

than ramie cloth| hybrid with whisker will decrease the tensile and impact strengths of the

composites containing either glass cloth or ramie cloth， but increase their flexural strengths and

tensile moduli. With the prolong of immersion time in water， the tensile strengths of the

composites reinforced with glass cloth along or glass cloth and whisker together at 30℃ and 50℃

will decrease| the impact strengths of the composites reinforced with ramie cloth reach the maxima

of 49.1kJ/m2 and 48.8 kJ/m2 at 30℃ and 50℃ respectively when immersed in water for 16h，

accordingly 98.78% and 97.57% increased from those before immersion， and the impact strengths of

the composites reinforced with the hybrid of ramie cloth and whisker increase monotonously with time

at the two temperatures through the whole water immersion test.

THE ROLE OF TEMPERATURE ON IMPACT PROPERTIES OF
KEVLAR/FIBERGLASS COMPOSITE LAMINATES

Liu, H. Y., Liu, D. Q.

2009, 205(6): 25-27.

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This paper demonstrated results of an experimental study on Kevlar/fiberglass composite

laminate subjected to impact loading at variable temperaturesThe effect of temperature on maximum

energy， elastic energy， maximum deflection after impact was studied at several low velocity impact

energy levels(8J， 15J and 25J) The temperatures considered were in the range of -50℃ to 120℃

Results indicated that impact performance of these composites was affected over the range of

temperature considered.

STUDY ON THE PREPARATION AND MECHANICAL PROPERTIES OF
CARBON FIBER REINFORCED CEMENT COMPOSITES

Zheng, Z. Q., Yu, Y., Yan, X.

2009, 205(6): 31-34.

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Sodium Carbonxymethyl Cellulose (CMC) and Fine Silicon Fumes (SF) were used as composite

dispersants of PAN based carbon fiber for fabricating carbon fiber reinforced cement composites

(CFRCC) in this paper. The effect of the mixture ratio of composite dispersant on the mechanical

properties of CFRCC and the relationship between mechanical properties and the content of carbon

fiber as well as water cement ratio were studied. The results showed that it was a good way for the

dispersion of carbon fiber， it was found that the flexural strength and compressive strength of

CFRCC could be improved by 31.22% and 41.25% in 7 days respectively， when the content of carbon

fiber in cement was 1%， CMC and fine silicon fumes were 0.05% and 15%， the watercement ratio was

0.3 to 0.32.

POLYURETHANE/CARBON NANOTUBE COMPOSITES PREPARED BY SOLUTION
MIXING AND THEIR PROPERTIES

Wang, J. R., Xie, H. Q.

2009, 205(6): 35-38.

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Carbon nanotubes were treated with acid， and their structures and dispersion stability

were further investigated. Polyurethane/carbon nanotube composites were prepared by solution mixing

and their structures were characterized by FTIR. The mechanical properties， elastic recovery

behavior and thermal stabilization of the composites were analyzed. It indicated that the carboxylic

acid groups were added onto the carbon nanotubes and the dispersion stability of CNTs in DMAc was

improved. The CNTs were hydrogen bonded onto the polyurethane matrix. Consequently， the mechanical

and thermal properties of the composites were both enhanced， while the elastic recovery behavior

was little affected.

EXPERIMENTAL STUDY ON ULTRASONIC EVALUATION OF
CARBON/EPOXY 3D BRAIDED COMPOSITES

Wang, G. J., Sun.Y, Li, J. L.

2009, 205(6): 39-42.

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Ultrasonic echo Ascan method was used to scan carbon/epoxy 3D braided composites.

Defects areas located by using ultrasonic scanning were anatomized microscopically to investigate

the relationships between the ultrasonic pulse wave characteristics and micromorphology of

defects. Based on the experimental identification method depended on wave analysis method,the

ultrasonic attenuation of 3D braided composites was discussed from the point of the distribution of

carbon filaments and the interfaces between carbon fiber bundles and resin. The experimental results

show that the characteristics of ultrasonic propagation and attenuation in the composites are

related to the microstructure and some defects within the 3D braided composites. The

characterization of ultrasonic Ascan signal can be used to nondestructive inspection and defects

assessment.

STUDY ON THE PREPARATION AND PROPERTIES OF HEMP/POLYETHYLENE COMPOSITES

Zhuang.X.M Zhang.H.P Yan.X

2009, 205(6): 43-44.

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Hemp fabric reinforced polyethylene composites were prepared in this paper. The effects of

processing parameters on the tensile and impact properties were investigated. The influence of hemp

fibre content on the properties of the composites was discussed. The fracture surface morphology was

investigated by using scanning election microscopy. The results showed that optimum processing

conditions of the composites were obtained.

RESEARCH ON MODIFIED CYANATE ESTER RESIN SYSTEM FOR FILAMENT WINDING

Tian.J ZHang. S.P

2009, 205(6): 45-47.

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Cyanate ester(CE) resin was modified with epoxy resin in this paper and a modified cyanate

ester resin system for wet winding was developed. The curing properties of this system were studied

in the gel test and DSC test. The trend of the modified CE resin viscosity changing with temperature

and time was got， so that some parameters such as process temperature， winding speed， and the

working life of modified CE system were determined. Meanwhile， the thermal， dielectric，

mechanical properties and the interfacial performances of the modified CE matrix with glass fibers

or carbon fibers were also studied.

EFFECT OF CURING AGENT CONTENT ON RTM EPOXY SYSTEM CURING PROPERTIES

Chai, H M., Wang, P., Wang, L., Sun, C. M.

2009, 205(6): 48-49.

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In this paper， the RTM epoxy system had been synthesized by modifying Bisphenol A epoxy

and adding a kind of amine curing agent. The effect of curing agent content on the performance of

epoxy system were studied by DMA and mechanical testing machine. The results showed that， the glass

transition temperature was low whenever curing agent content was higher or lower，but when the ratio

of epoxy and curing agent was 100∶31， the maximum glass transition temperature of the system was

about 92.4℃， and the mechanical properties of the system were good.

STRUCTURAL ANALYSIS AND LAMINATION OPTIMUM DESIGN
OF WIND TURBINE ROTOR BLADE

Li, C. L., C. C.

2009, 205(6): 50-53.

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Structural analysis of wind turbine blade is an important part in the process of blade

design. Structural dynamics and statics analysis are performed for 750kW blade with finite element

method in this paper, lamination has been optimum designed on the basis of analysis. Compare with

the results of structural analysis before and after optimization, the effectiveness and reliability

of structural optimization has been proved, it has some reference value for the largerscale wind

turbine blade on structural analysis and lamination optimum design.

PERMEABILITY OF THICK LAYUP OF GLASSFIBER FABRIC IN VARTM PROCESS
AND PROCESS OPTIMIZATION

Gao.Y.T Li.W Luo.Y.K

2009, 205(6): 54-5.

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The permeability of different thick layup of glassfiber fabrics was investigated in

VARTM with radial flow method. Flow characteristics in top and bottom layer and in 3D was also

analyzed.The process optimization programmes were referred， and the feasibility were testified，

which can provide solution for making thick layup components.

RESEARCH ON RESIDUAL STRESS OF SEAL EDGE IN VACUUM PLATE GLAZING

Wang, M. Y., Zhang, R. H., Zhang, J. F., Miao, H.

2009, 205(6): 58-61.

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Based on vacuum flat glass by a laboratory sample preparation， the residual stress field

of seal edge of vacuum flat glass was researched by the electric measuring， it successfully tested

the distribution of residual stress field of seal edge. Residual stress field of seal edge of vacuum

flat glass was analyzed by numerical analysis method. By this method， the law of the stress

distribution was obtained. The theoretical calculation results were basically consistent with the

experimental results. It was explored that the linear expansion coefficient of seal edge having an

influence on the residual stress of vacuum glass， and analyzed the stress coupling of seal edge

having an influence on the residual stress of vacuum glass too. Using the residual stress as the

basic parameters of assessing the failure of vacuum glass， to reveal the relationship between the

residual stress intensity and elasticity modulus， and create the new failure calculation method

based on the residual stress of vacuum flat glass. The contents of above mentioned study provided a

theoretical basis for the allowable analysis of the seal edge residual stress of vacuum glass.

CHEMORHEOLOGICAL BEHAVIOR AND CURE KINETICS OF
SILICONRYLACETYLENECONTAINING RESIN FOR RESIN TRANSFER MOLDING

Q.H.M W.C.L G.J.M

2009, 205(6): 62-65.

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Siliconarylacetylenecontaining resin (PSAR) is applied in aerospace and electrical

industries， which is suitable for resin transfer molding with hightemperature resistant，

excellent dielectric constant， hightemperature mechanical property and processability. The cure

kinetics of PSAR resin was analyzed by using dynamic differential scanning calorimetry(DSC)， and

it was found that the cure of PSAR resin followed an nthorder reaction mechanism. The reaction

order was nearly two with activation energy of 110kJ·mol1. The chemorheological behavior of PSA

R resin was studied with parallel plate viscosity spectrometer. A rheological mode based on the dual

Arrhenius equation was estabilished and used to simulate the rheological behavior of PSAR resin.

The model prediction determined from the dualArrhenius equation was in good agreement with

experimental data.

ADVANCES OF NONDESTRUCTIVE TESTING OF COMPOSITE MATERIALS

Ge, B., Yang, T., Gao, D. B., Li, M.

2009, 205(6): 67-71.

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Detected composite materials technology plays an important role in the production and

application of composite materials. This article describes different methods of the detection of

composite materials at home and abroad， including the traditional methods as detection technology

of sound， light， electromagnetic waves and new detection techniques that relatively rapid

developed in recent years， briefly elaborates the signal processing methods in detect the process

of composite materials.

APPLICATION OF RESIN BASED ABSORBING COMPOSITES IN AERONAUTICS
AND ASTRONAUTICS

Zhai, Q. X., Huang, Y., Miao, L., Chen, Y.

2009, 205(6): 72-76.

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The types of resin based absorbing composites were presented， such as

carbon/thermoplastic resin based composite， fiber reinforced resin composites， resin based

nanocomposite.With the research of material， characterization methods of the absorption properties

were presented.Finally the application in aircraft， tactical missiles were discussed.

STUDIES ON THE LONGTERM MECHANICAL PROPERTIES OF FRP TENDONS

Zhan, J. D., Du, X. L., Wang, Z. H.

2009, 205(6): 77-80.

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Because of excellent corrosive resistance， FRP has been taken as an attractive

alternative reinforcing material for steel to the corrosion problem. At the same time， FRP provides

a high strength， good fatigue properties， low relaxation and creep rates， etc. Based on extensive

reading of references at home and abroad， this paper describes the newest research work on the long term mechanical properties of FRP tendons.

APPLICATIONS AND DEVELOPMENT OF COMPOSITES IN RAILWAY TRANSPORTATION

Jiang, J. H., Chen, J. J.

2009, 205(6): 81-85.

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The paper estimated main properties of composites，introduced the applications and

development in railway transportation at home and abroad.

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