COMPOSITES SCIENCE AND ENGINEERING

FINITE ELEMENT ANALYSIS OF COMPOSITE WING FOR UNMANNED
AERIAL VEHICLE BASED ON MSCNASTRAN

Yin, X. X., Feng, Z. Y., Lu, X.

2010, 210(1): 3-6.

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Based on the composite wing of certain Unmanned Aerial Vehicle (UAV),four different finite element models of the composite wing are established by MCSPatranUsing those four finite element models,strength check and modal analysis are carried out with the finite element software MSCNastranAccording to the analysis results of the loadings of components,the structural form and material of the composite wing are optimizedThe service life is prolonged and the production cost is reduced for the Unmanned Aerial Vehicle by the optimization analysis

THE STRUCTURAL DESIGN OF COMPOSITE DEWAR BASED ON
THE MATERIAL OUT GASSING RATE

Zhang, Y. B.

2010, 210(1): 7-9.

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Fiberglass reinforced composites were tested at the room temperature for evaluating their vacuum performances，out gassing rate and the composition of the gasses were obtained from experimental dataBased on the experimental data,the structural design of the composite Dewar was carried out,this provided the theoretical basis for improved the quality of the composite Dewar

HOLESHAPE PARAMETERS OPTIMIZATION OF COMPOSITE MATERIALS PLATE
BASED ON MINIMAL HOLEEDGE STRESS AND DISPLACEMENT

Tie, Y., Li, C.

2010, 210(1): 10-12.

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Based on strength analysis result of main loadcarrying zone of composite plate using the finite element method, using APDL，the optimization of the hole size parameters is carried out. The maximal value of first principle stress S1 and displacement in X direction are as objective function in this optimization. The hole shape is designed based on minimal S1 and UX. Also, the influence of hole size parameters on the S1 and UX is obtained.

TWOSTAGE LOADING FATIGUE LIFE PREDICTION OF COMPOSITE LAMINATE

Shi, X. C., Zhao, M. Y.

2010, 210(1): 13-15.

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This paper based on the data of twostage loading glass /epoxy composite laminate fatigue life experiment, integrates unlinear damage cumulative theory to get the residual life formula of the second loading, and then popularizes to get life formula of threestage and more stage. Compares the results get from the formula to the experiment, the result proves the formula is accurate. And so we can get the loading order effect on fatigue life of composite laminate.

RESEARCH ON STIFFNESS REDUCTION OF COMPOSITE LAMINATES BASED ON
THE TWOSTAGE THEORY OF FATIGUE DAMAGE

Jia, B. H., Li, D. H., Li, W., Xu, J. X.

2010, 210(1): 16-19.

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No matter composite laminates is subjected to static or dynamic load, damage is significantly complex. Accurate modeling for fatigue damage can reveal the damage mechanism of composite laminates. In this paper, based on the cumulative damage theory and stiffness reduction model, fatigue damage of the composite was divided into two stages by the twostage theory of the fatigue damage. The fatigue damage process of composite was established by a segmented function and twostage model of fatigue damage. The segmented function includes two kinds of difference functions, exponential function and linear function. By using the experimental data and least square method of multivariate function, the parameters of this twostage fatigue damage process model and the SN curve were obtained. The SN curve was compared with that of experimentation and classical model. And the results obtained by present method are in good agreement with the results of experimentation.

THE DEFORMATION OF COMPOSITE LAMINATE:THE RELATIONSHIP
BETWEEN RESIN MATRIXES,FIBER,UNSYMMETRIC LAYS AND DEFORMATION

Li, Y. L., Yi, X. S., Tang, B. M.

2010, 210(1): 20-23.

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The deformation of composite laminate was studied in this paper.The relationship between resin matrixes,fiber,unsymmetric lays and deformation was discussed. Epoxy, polybenzoxazine and bismaleimide were resin matrixes,some prepregs were chosen as materials,［0/0/90/90］ was mainly unsymmetric lays, ANSYS was used to demonstrate the deformation of composite laminate,and the deformations were compared between forecast and realization. The results showed that resin matrix materials and lays affected the deformation of composite laminate.

FIELD CONTRAST TEST STUDY ON ANCHORING MECHANISM OF GFRP
ANCHOR ROD WITH DIFFERENT DIAMETERS

Huang, Z. H., Li, G. W., Li, Y. Q.

2010, 210(1): 24-27.

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Rock bolting is a support widely used in slope engineering， tunnel and large cave support， as well as reinforcement of building structure.As the main part of support structure， the bolt must have enough reliability and durability.However， it is easily eroded by the environment for steel， so the durability of steel bolt being used commonly should be paid more attention to.The glass fiber reinforced plastics (GFRP) bolt is a new kind reinforcement material which is compounded with resin and glass fiber， having better mechanical property and corrosion resistance. The durability problem of slope engineering can be solved if GFRP bolt take the place of steel bars.The tensile test studies the failure characteristic and anchoring mechanism of GFRP anchor rod with different diameters of 16 and 32， under the same lithologic characters and three different weathered conditions of adjoining rock: complete， modest and slightly. The result indicates as follows:The GFRP anchor rods with different diameters finally fail in the way of brittle split failure. The ultimate bearing capacity of GFRP anchor rod increases with its diameter. The stress transmission depth of 16 is affected less by weathered degree of adjoining rock， while the one of 32 is affected greatly by weathered degree. The stress transmission depth of GFRP anchor rod increases with the weathering degree of adjoining rock. The bond strength between the GFRP anchor rod and the surface of mortar decreases as the diameter increases.

OPTIMIZATION OF COMPOSITE PATCH BONDING REPAIRING PARAMETERS

Li, X. G., Zhao, M. Y., Wan, X. P.

2010, 210(1): 28-31.

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For penetrability damage composite components,composite material rounded patch adhesive bonding repair was used to recover strength. This paper introduced the method to analyze the effect of composite patch adhesive bonding repairing parameters. The author utilized the double platebond element in the finite element model to analyze the repair efficiency of the adhesive bonding repairing method with MSC/NASTRAN and obtain some valuable conclusions

STUDY ON GEL TIME CONTROL TECHNOLOGY OF VINYL ESTER RESIN

Tang, Z. H., Lv, X., Guan, L. L.

2010, 210(1): 32-35.

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In this paper, based on vinyl ester resin curing reaction for free radical polymerization characteristics，it took proper polymerization inhibitor or other additives with the polymerization inhibition action,which extended room temperature gel time of vinyl ester resin and controlled in a relatively wide range. The operable time of vinyl ester resin was greatly extended, which facilitated its wide application.

EFFECT OF CARBOXYL FUNCTIONALIZEDMULTIWALLED CARBON NANOTUBES ON
PROPERTIES OF T1000 CARBON FIBER/EPOXY COMPOSITES

Tian, J. B., Liang, S. B., Sui, G., Yang, X. P.

2010, 210(1): 36-39.

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Carboxyl functionalizedmultiwalled carbon nanotubes (COOHMWNTs) were prepared as nanoreinforcement for T1000 carbon fiber/epoxy composites. COOHMWNTs can be uniformly dispersed in epoxy matrix. The experimental results show the interfacial properties and heatresistance properties of composite were improved. Mechanical test of filament wound composites exhibit a 28% enhancement in the shear strength after adding 1wt % COOHMWNTs.

ANALYSIS OF ANTIPIERCING IMPACT FEATURES AND MECHANISM
OF HIGH PERFORMANCE FABRIC

Yang, Z. J., Zhang, Z. G., Sun, Z. J., Li, M.

2010, 210(1): 40-45.

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High performance fabrics are widely used in the antipiercing area In order to research the feature and mechanism of high performance fabric punctured by the tools, the drop mass device of which mass and height were adjustable was designed. Singleedged knife, threesquare knife and cone were chosen to spike the aramid fabric and UHMWPE fabric in the experiments. Due to this, the effect laws of impact energy, crosssection shape of the tools and the angle of incidence to the puncture were researched, and so were the type of fiber in the fabric, the structure of the fabric and laminated density to the protection. The analysis results shows that, the puncture effects are mostly due to the energy, but have less to do with the proportion of speed and mass. When the fabrics are punctured, the destroy patterns are depend on the crosssection of the tool. The structure is a key factor to the antipiercing ability for high performance fabrics For the fabrics made of the same material, the structure which has a good ability of antisqueeze will be better in antipiercing to cone and singleedged knife But to threesquare knife, the structure does not have obvious effect

STUDY OF PERMEABLE PROPERTY OF THICKSECTION REINFORCEMENT

Liang, X. N., Li, W., Luo, Y. K., Zhang, J. N.

2010, 210(1): 46-48.

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With the help of sensing and monitoring system, the permeable property of thicksection reinforcements was studied with the radial permeability testing method. By comparing and analyzing different laidup thickness of glass fiber reinforcements, it is noticed that the permeability is decreasing when thickness of reinforcements increase. The slope of the decreasing is getting smaller with thicker section of the reinforcements. By comparing flow front position of the top and bottom layer of the reinforcements, it is found that the leadleg difference between the top and bottom layer is increasing when the thickness of reinforcement increases. It is found that the flow front position of the top and botton layer will keep catch up with each other at certain time. The time is getting larger when thickness of reinforcement increases.

STUDY ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF UNIDIRECTIONAL
CARBON FIBER REINFORCED COMPOSITES WITH TDE85 AND AG80 EPOXY RESIN MATRIX

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

2010, 210(1): 49-52.

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Two kinds of composite board with multifunctional group of epoxy resin TDE85 and AG80,reinforced by T300 carbon fiber. The volume percentage of carbon fiber is 60%. The experimental results show that the bending modulus of TDE85 composite board reaches 74.26GPa, the bending strength reaches 1061.4MPa, and the interlaminar shear strength(ILSS) reaches 54.05MPa. At the same time, the bending modulus of AG80 composite board reaches 55.73GPa, the bending strength reaches 840.52MPa, and the interlaminar shear strength(ILSS) reaches 44.84MPa. The crosssections and interfaces of unidirectional carbon fiber reinforced composites with different resin matrices are studied by metalloscope, electron probe microscope and scanning electron microscope (SEM). The results indicate that for unidirectional carbon fiber reinforced composites with different resin matrices which were prepared in the same condition, so many carbon fibers were pulled out from the AG80 resin matrix, and nearly no matrix paste on the fiber. On the contrary, there were small number of fiber pulled out from TDE85 resin matrix, fiber and resin combined with relatively close.

SOUND ABSORPTION PROPERTIES OF FLEXIBLE NEEDLEPUNCHED NONWOVENS

Hu, L. C., Chen, F. Y., Yan, X.

2010, 210(1): 53-56.

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Several needlepunched nonwoven samples are tested through impedance tube methods and some factors affecting the sound absorption properties are discussed， such as fiber type， fiber size， thickness， bulk density， air gap and air permeability. The research results indicate that the thickness and bulk density play more important roles. The relation between thickness and sound absorption coefficient is a positive linear correlation and that between bulk density and sound absorption coefficient is a quadratic correlation under different frequencies.

PREPARATION OF EXTRAVEHICULAR SPACESUIT HELMET FOR
“SHENZHOUQIHAO” AIRSHIP

Shu, W. G., Yang, X., Song, M. J.

2010, 210(1): 57-59.

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In this paper， the preparation background and processes of extravehicular spacesuit helmet for “shenzhouqihao” were presented. The achievement of “shenqi” had indicated the progresses in preparation of extravehicular spacesuit helmet.

COMPOSITE STRUCTURE DESIGN OF GEOMETRIC TWIST WING FOR UAV

Zhang, Y. M., Zhao, P. F., Liu, B.

2010, 210(1): 60-62.

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The exterior of geometric twist wing is contorted,so the manufacture of this wing is difficult.It is introduced the composite structure design of geometric twist wing for UAV in this paper.The technological design is skillful that it is jointly solidify composite structure comprised sandwich construction and spar caps,and then it is predigested the assembly harmony of parts of wing.This design has been applied in a UAV successfully,and the effect is all right.

DESIGN AND CALCULATION OF NACELLE COVER OF 3D SANDWICH
COMPOSITES FOR WIND POWER

Zhou, Z. L., Wu, B. M., He, Z. Y., Ding, S. Z.

2010, 210(1): 63-66.

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This paper presents the strength rigidity and stability calculation of nacelle cover of 3D sandwich composites for wind power.The results show that, using 3D sandwich construction composites may reduce 40%~50% weight of the product.

OPTIMIZATION OF PROCESSING TECHNOLOGY FOR PENTAERYTHRITYL
TETRABROMIDE WITH ORTHOGONAL DESIGN

Chen, S. J., Z. J. J., Meng, Y.

2010, 210(1): 67-69.

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To optimize the processing technology for pentaerythrityl tetrabromide with yield ratio as a marker，with the method of orthogonal experimental design,the paper investigates the influencing factors such as reaction time，reaction temperature and the content of catalyst. The result shows that the optimum condition of processing technology is reactive for 14 hours，with the temperature of 140~150℃， and the content of catalyst is 1.5g. The reaction time has significant effect on the yield ratio.

STUDY ON THE INFLUENCE OF THE SIZING ON MECHANICAL PROPERTIES OF
SHORT GLASS FIBER REINFORCED PA66

Chen, X. J., Yue, Y. L., Zhu, Y. M., Yu, X. J.

2010, 210(1): 70-72.

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The influence of the sizing with different component on the mechanical properties and microstructure of short fiber reinforced PA66 composites were investigated by using twinscrew extruder and injection machineThe results showed when the vinyl ester or melamine was added into T435D,the tensile strength,bending strength and Charpy impact strength of the short glass fiber reinforced PA66 were all improved to some extentThe microstructure of interface investigated using SEM was also improvedBut the latter was better

Simulation of unsteady temperature field and degree of cure for GFRP pultrusion and experiments

Xie, H. Q., Chen, X. K., Liang, F.

2010, 210(1): 73-76.

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The temperature and degree of cure of glass fiber reinforced plastic (GFRP) are coupled during the pultrusion process. The unsteady temperature field and curing models were established on the basis of heat transferring and resin curing mechanism. The kinetic parameters of polymer matrix used for simulation were acquired from the differential scanning calorimeter scans. The finite element method and finite difference method were implemented to solve the coupling problem between temperature field and curing models; and the numerical simulation of temperature and degree of cure of GFRP was realized on the basis of ANSYS. The fiber Bragg grating sensor, encapsulated in a metal capillary, was adopted to monitor the centerline temperature of GFRP; and the final degree of cure was measured by Sorbitic extraction. It shows that the simulative results are in good agreement with the experimental ones. The simulative way will make the process optimization more feasible and convenient.

THE RESEARCH OF MECHANICAL PROPERTIES OF 3D BASALT HYBRID COMPOSITE

Zhang, M. X., Hu, H.

2010, 210(1): 77-81.

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A novel 3D basaltreinforced hybrid composite was designed integrating the respective characteristics of woven and knitted composites. The tensile, threepoint bending and drophammer impact tests were conducted on the samples and three failure mechanisms for each were also analyzed.

STATEOFTHEART ON SHEAR BEHAVIORS OF CONCRETE BEAMS WITH FRP TENDONS

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

2010, 210(1): 82-85.

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Compare with ordinary steel rebars, FRP tendons have the characteristics of high tensile strength, noncorrosive, light weight and low elastics modulus, etc, which have been taken as an attractive alternative reinforcing material for steel to the corrosion problem However, FRP’s transverse strength is very low, studies on shear behaviors of concrete structures with FRP tendons have been emphasized in engineering structure field This paper briefly introduces the main progresses in the studies on shear behaviors from nonprestressed and prestressed concrete beams with FRP tendons Finally, advices for advanced research are proposed

THE DESIGN OF POLYMER COMPOSITE MOLDING WITH PRESSURE

Bi, X. J., Li.Z.H., Tang, Z. H., Li, W.

2010, 210(1): 86-88.

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This article introduces the advantages of some traditional composite moldings after adding pressure.

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