COMPOSITES SCIENCE AND ENGINEERING

EXPERIMENTAL RESEARCH ON STRENGTH AND SIZE EFFECTION OF CIRCULAR
CONCRETE COLUMNS REINFORCED BY BFRP

SONG Gong-He, ZHANG Hai-Hun

2009, 209(4): 3-5.

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Based on a test of circular concrete columns of different sizes confined by BFRP under uniaxial load,the mechanics properties and size effection of specimens were studied and axial compressing strength model of specimens was presented. The results suggest that the model has a good degree of agreement with experimental datas and circular concrete columns of different sizes exist size effection.

LOCAL BUCKLING ANALYSIS FOR LAMINATED COMPOSITE PLATES
OF PLATECONE RETICULATED SHELL

WANG Xing, WANG Fan, CA Sai-Yuan

2009, 209(4): 6-10.

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Platecone reticulated shell is a new type of space structure with good mechanical behavior and technical economy. In this paper,with theory of composite mechanics and theory of composite plate,shell through composite structure finite element method,local buckling and influence factors of laminated composite plates for platecone reticulated shell were analyzed,the mechanical characteristics of composite platecone reticulated shell were studied, some important conclusions were obtained, which could provide theoretical foundation for practical design of composite platecone reticulated shell and laminated composite plates.

STUDY OF THE CFRP CYLINDER UNDER EXTERNAL HYDROSTATIC PRESSURE

XIAO Wen-Gang, WANG Rong, QIAO Ren-Hai

2009, 209(4): 11-13.

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A general design methodology was presented for CFRP cylinder for deep ocean applications under external hydrostatic pressure. The formula method and FEA were comparable with the experimental results.

SIMPLIFIED CALCULATING METHOD OF AFRP BONDING LENGTH FOR REINFORCED
CONCRETE BEAMS STRENGTHENED WITH EXTERNALLY BONDED AFRP

TIAN Guo-Zhi, WANG Xu-Rong, WANG Wei-Zhi, ZHANG Shen-Wei

2009, 209(4): 14-16.

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Based on the test results of RC beam strengthened with externally bonded AFRP, this paper analyzes the premature failure process of reinforced concrete members strengthened with externally bonded AFRP, the interfacial shear stress is maximum at the AFRP cutoff point and starts to decay as the distance from the cutoff point is

EXPERIMENTAL STUDY ON FLEXURAL STRENGTHENING OF RC BEAMS WITH
NEAR SURFACE MOUNTED CFRP

DING E-Gong, ZHANG Chun-Sheng, CENG Xian-Tao

2009, 209(4): 17-20.

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This paper presents research on four beams strengthened with CFRP bonded in sawed grooves in the concrete cover under monotonous loads. The firstcrack load, steelyielding load, ultimate load at failure and deformation are systematically studied. Test results indicate that the strengthening method could overcome the problems with peeling of the strengthening material when surface bonded FRP laminates, and exhibites higher ultimate load compard with nonstrengthened beams, which shows that the ultimate load could be increased by 81.89％, and the space between cracks is smaller, the number of cracks is more, the width of cracks is smaller, as well as the deformation capacity is larger,but it shows no effect on cracking load and yield load . The construction of the method is simple. So, this new strengthened method is an efficient method .

DESIGN AND STUDY OF ULTRASONIC TEST SYSTEM FOR
VOID CONTENT IN COMPOSITE MATERIALS

JIANG Zhi-Feng, TUN Rui-Meng, TUN Zuo-Lun, SONG Li-Jun

2009, 209(4): 27-31.

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On the basis of ultrasonic test theory model, the ultrasonic testing data acquisition and data processing methods were described. Computer control system for ultrasonic testing technology researched timedomain waveform signal processing based on ultrasonic board. The Cscan image and column chart of CFRP surface were obtained. The result showed that the test system based on automation can accurately test the void content of carbon fiber reinforced plastics on the spot.

ELECTRICAL RESISTANCE RESPONSE OF CARBON NANOTUBE
/ PMMA / PVAC COMPOSITE FILM

CHAI Gong-Mei, SUN Chao-Meng, DIAO Dong-Lin, CHEN Ceng-Min

2009, 209(4): 32-34.

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The chemorheology behaviors of curing reaction of benzocyclobuteneterminated imide were studied with rheometer.The curing process was investigated by dynamic heating and isothermal methods,and three curing stages were found.Apparent physical activation energy of flow calculated by Arrhenius equation was 195.9kJ/mol.Apparent chemical activation energy of flow and apparent curing reaction activation energy were calculated by Roller equation, respectively.The results show that the viscosity characteristic of resin follows the Roller equation very well, and viscosity characteristic of resin can be predicted by the Roller equation in the whole curing process.

THE SOLUTION FOR ADVERSE IMPACT OF CARBONATION ON CONCRETE
BRIDGE DECK SLABS BT USING GFRP REINFORCEMENT

ZHENG Yu, QIN Fu-Quan, LI Chun-Gong

2009, 209(4): 53-58.

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As crucial structural components in bridge structures, bridge deck slabs played an important role in integral structural behaviours and transportation. However, with the increasing of ages in services, the durability of reinforced concrete bridge deck slabs was influenced significantly by carbonation. Recently, because of high strength, light weight and strong corrosionresistance, glass fiber polymer reinforcement bars (GFRP bars) were accepted by civil engineers. Due to the existence of compressive membrane action, it was shown that the structural behaviours of GFRP reinforced concrete bridge deck slabs with same reinforcement percentage were similar as those of steel reinforced concrete bridge deck slabs in nonlinear finite element analysis. Based on numerical analysis results, GFRP is available to be used as replacement of steel reinforcement. According the analysis of mechanism of concrete carbonation and material properties of GFRP, it was found that the durability of GFRP reinforced concrete bridge deck slabs was enhanced after the occurrence of carbonation in concrete structures, because carbonation reduced the permeability and porosity of concrete.

INVESTIGATION ON THE DARKING PROBLEM OF GALVANIZED METAL
INSERT IN COMPOSITE MOLDING PROCESS

CHEN Yang, XIAO Yong-Dong, FU Chao-Jun, QUAN Wen-Hua

2009, 209(4): 59-62.

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As a main form of connectivity,the metal insert is widely used in various composite molding processes. This paper clarifies the main reason that may affect the galvanized metal insert darkening in the molding process, resolves the darkening problem by effective means.

STUDY AND MODIFY ON RHEOLOGICAL PROPERTY OF A BISPHENOL A CYANATE RESIN

LU Bo, ZHANG Zuo-Guang, GU Yi-Zhuo

2009, 209(4): 63-66.

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The rheological property of a bisphenol A cyanate resin was investigated by means of parallel plate method, it was modified by isothermal precure process. The effects of precure process on the chemical structure of resin were studied by IR, DSC and GPC methods. In addition, the influence of the pressure applying moment and precure conditions on the quality of S2 glass fiber/cyanate resin composite laminates was analyzed for hot press process. It is shown that the cyanate resin has low cure reactivity and high flowability, so the resin flow can not be controlled easily. The precure process makes the resin cure to a certain extent, decreases resin flowability, improves resin processability significantly, and enhances the composite laminates quality.

MECHANICAL PROPERTIES AND MANUFACTURING PROCESS OF
LATTICE REINFORCED SANDWICH COMPOSITES

FANG Hai, LIU Wei-Qiang, WAN Li

2009, 209(4): 67-69.

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The vacuum infusion molding process (VIMP) is becoming popular as a new type for largescale/unusual composites. Selecting H60 PVC foam, fouraxis Eglass nonwoven fabric and vinyl resin, a type of innovative reinforced sandwich composite as lattice reinforced sandwich (LRS) are fabricated by VIMP. The fabrication results show that VIMP is a highspeed and costeffective manufacturing method because of the resin flow channel provided by the acuminate grooves in both sides of foam core. The lattice in LRS along core’s height assure an even flow on both sides of core that can complete the filling process in a short time. The shear, flatwise compression and flexural behavier of LRS are enhanced compared with the traditional sandwich. The flexural ultimate bearing capacity of LRS are studied which can be used as reference to engineering practice.

THE INFLUENCE OF MOLDING PRESSURE IN AUTOCLAVE TECHNICS ON
TEMPERATURE FIELD OF FRAME TOOLING

WANG Yong-Gui, LIANG Xian-Zhu

2009, 209(4): 70-73.

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The theoretic analyses and engineering experiments results showed, the molding pressure in autoclave technics can improve the uniformity of temperature field of frame tooling, and shorten the temperature rising period of thermal history.

FINITE ELEMENT ANALYSIS ON GFRP TRAFFIC LIGHT FRAME

YIN Bo

2009, 209(4): 74-76.

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A great number of signal light frames are used in traffic engineering,the important guideline of engineering construction is quality ,durability and cost . Compared with steel, the property of glass fiber composite material is discussed, and a traffic light frame is investigated with the finite element soft ware ANSYS.

EXPERIMENTAL STUDY ON FLEXURAL BEHAVIORS OF PBO FIBER
PLATE REINFORCED CONCRETE

LIANG Xi-Feng, Zhang-Chun-Hua, Qu-Mu-Chao, WANG Shu-Xian

2009, 209(4): 77-79.

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The unidirectional PBO fiber sheets are layered on the concrete to strengthen the flexural properties. The bending performance of the reinforced concrete with different fiber volume content using threepoint bending experiment has been studied. And a digital scanning technology has been used for investigation destruction feature of the concrete. The results show that the flexural strength of the concrete has been significantly improved by PBO fiber sheets, and flexural strength of the concrete becomes higher and higher as raising the fiber volume fraction. When the fiber volume content is 1.35%, the bending strength of the concrete is about 3.6 times compared with the plain one. The destruction of the concrete changes from the brittle fracture of plain concrete to the toughness fracture.

TECHNOLOGICAL PERFORMANCE RESEARCH OF THE HIGH
STRENGTH AND ANTIABLATION MATERIAL

QUAN Wen-Hua, XIAO Yong-Dong, XU Ge, FENG Cai-Mei

2009, 209(4): 80-82.

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The tenacity of phenolic resin is improved by adding modifier, experiments are done to research different enhancement projects such as the cutshort high strength fiber, the fixedlength high strength fiber, the high strength fiber fabric, carbon cloth and the function interlayer,etc. The bending properties of different material systems are investigated, the material technological performance is researched,the comprehensive intensity of different material systems is investigated by imitating the static experiments ,and the project application of the products is realized.

STUDY AND APPLICATION OF LARGESCALE CONCRETE BEAMS
STRENGTHENED WITH CFRP LAMINATE

WANG Xin-Guo, ZHANG Chun-Sheng, WANG Wen-Hua, ZHOU Chao-Yang

2009, 209(4): 83-85.

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Large scale concrete beams were strengthened by prestressing CFRP laminate with the special mechanical stressing and anchoring tools, then the strengthened beams were carried out to failure under the monotone load. On the basis of experimental results, the prestressing technique is used to rehabilite a railway simplysupported concrete bridge. The strengthened effect is good through testing the change of crack width and the midspan deflection.

EXPERIMENT RESEARCH ON THE FRP BOLT UNDER ECCENTRIC LOAD

LI Ying-Meng, MA Nian-Jie, YANG Ke

2009, 209(4): 86-88.

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FRP bolt is the ideal supporting material used for coal side. Owing to construction, the FRP bolt is often under eccentric load which is harmful for bolt by theory analysis. This paper first applies experiment to simulate FRP bolt under eccentric load, designs eccentric load experiment. Compared with general load, experiment results show the most extensioncontradict drawing and elongation feature have a great reduce under eccentric load.

THE POSSIBILITY OF TAIHU LAKE SILT APPLIED FOR SHEET MOLDING COMPOUND FILLER

JIANG Hai-Jing, YE Yong, YANG Jing-Yuan, WANG Xiao-Jun

2009, 209(4): 89-92.

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The possibility of Taihu Lake silt applied for the sheet molding compound filler was studied from the silt chemical and physical properties and its structure.XRF was used to analyze the chemical compositions，the mineral phases was analyzed by XRD，the particle size distribution was detected by photo size analyzer，SEM was used to observe the morphology of the silt，the structural specialties of the silt were characterized by IR and NMR，and the oilabsorbing value of the silt was also measured.These analyzed results showed that the chemical composition and mineral composition of the silt was suitable for a silicate filler of sheet molding compound.The D50 of Taihu Lake silt was similar to the calcium carbonate filler of sheet molding compound,and the organic groups of the silt contained made it easily combine homogenously with sheet molding compound resin,which also had a higher oilabsorbing value than the calcium carbonate.The Taihu Lake silt was suitable for sheet molding compound filler according to its up characters.

RESEARCH PROGRESSES OF WOODY FILLING/THERMOPLASTIC COMPOSITES

LI Yue-Wen

2009, 209(4): 93-99.

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The effect of species，dosage，dimension of woody filling and species of plastic on properties of woody filling/thermoplastic composites(WPC) was introduced，the research progresses about interface modification，toughening modification，processing modification and molding technology of WPC were summarized.

RECYCLING TECHNOLOGY OF COMPOSITE MATERIAL

XU Jia, SUN Chao-Meng

2009, 209(4): 100-103.

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This paper presents some methods of composite wastes recycling technology, compares the properties of several main methods which called chemical recycling, energy recycling, physical recycling and integrated approach. Points out that according to the countrys current macroeconomic policy, integrated approach such as cement kiln recycling should be greatly developed.

OVERVIEW OF THE DEVELOPMENT FOR FIBER REINFORCE
COMPOSITE WIND TURBINE BLADE

GAO Hui-Huan

2009, 209(4): 104-108.

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The current development of the wind powergeneration and the fiber reinforce composite wind turbine blade at home and aboard is briefly introduced, then the blade material, structural and aerodynamics design, and molding of the technology are also elaborated. Finally the development of turbine blade is described.

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