Table of Content

28 July 2013, Volume 0 Issue 4

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THE FORMING METHOD OF HIGH PRESSURE GRP PIPE BASED ON THE PROPERTY OF RESIN VISCOSITY

ZOU An-lan, GAO Liang-chao, GUO De-you, CHEN Guang-lie

2013, 0(4):  3-5. 

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With outstanding performance,the high pressure GRP pipes are widely used in the petroleum storage and transportation. How to improve the pressure-proof capability of GRP pipe is a research hotspot at present. Based on the property of resin viscosity,the goal to improve the pressure-proof capability becomes the problem of temperature control during the process of pipe forming. The numerical simulation program of the composite curing process is developed by ANSYS based on APDL. The winding process of curing method by constant temperature heating is simulated,and the change law of the temperature on the outer surface is obtained through analysis. Finally,the heating course is optimized,which keeps the temperature of outer surface in desired range.

STUDY ON THE EFFECT OF CURING PARAMETERS ON THE CURING DEFORMATION OF CAP-SHAPED STIFFENED COMPOSITE PANELS

XU Juan, LI Jian-chuan, PENG Jian, HE Kai

2013, 0(4):  6-11. 

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Cap-shaped stiffened composite panels are widely used in the fields of aerospace,energy,traffic,ocean engineering,medical,building,machinery engineering and so on because of its special properties such as high strength,high stiffness to weight ratio and design flexibility. During their manufacturing processes,however,thermo- curing inherently produces the undesired residual stresses and cure deformations,which limits the applications of composite structures in a certain degree. In order to reduce the cure deformation,the effect of curing parameters (curing temperature,curing pressure,cooling rate) on the deformation of composite cap-shaped stiffened composite panels is discussed in this paper. A simple mathematical model based on the curing dynamics is built for the deformation of the cap-shaped stiffened composite panels. The deformation calculated by the mathematical model and experimental results are compared,and an error correction model is established. The error correction model shows a good agreement on the experimental results.

SYNTHESIS OF 4,4 -DIPHENYL BISPHENOL A ETHER BISMALEIMIDE UNDER MICROWAVE IRRADIATION

LI Peng, ZHANG Yan, LIU Yu-jian, FANG Jun

2013, 0(4):  12-15. 

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Using maleic anhydride and 2,2'-bis[4-(4-aminophenox) phenyl]propane as raw materials,a novel bismalemide monomer,2,2'-bis[4-(4-maleimidophenox) phenyl]propane (BPA-BMI) was synthesized under microwave irradiation. The structure of compound was confirmed by FT-IR spectra,1H-NMR and MS. On the basis of orthogonal design,the optimal preparation conditions for BPA-BMI under microwave irradiation was as follows: the mola ratio of maleic anhydride to BAPP was 2.3:1,catalyst amount was 10%(wt%),microwave power was 450W and radiation time was 30min. The highest yield of product was 67.26%. Compared with tradition preparation of BMI,the method of microwave irradiation is convenient,quick and less pollution.

RESEARCH ON FRICTION AND WEAR BEHAVIOR OF MULTI-WALLED CARBON NANOTUBE/EPOXY COMPOSITES

CUI Li-jun, WANG Yi-bin, XIU Wen-jun, GENG Hong-zhang

2013, 0(4):  16-19. 

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Epoxy resin curing presents 3D cross-linking network structure characteristics,resulting in epoxy resin displaying a lower wear resistance,which limits its extensive applications. To overcome this disadvantage,in this paper,the effects of adding carbon nanotubes into epoxy and electroless plating on friction and wear behavior of epoxy-based composites were studied. The results showed that the friction coefficient and wear rate of the epoxy composites with 0.5wt% amino-MWCNTs are 0.314 and 0.93×10^-4 g·min^-1,respectively. Compared with the neat epoxy,its wear rate decreased by 41.3%. Thus,the friction coefficient and wear rate were effectively decreased by adding carbon nanotubes into epoxy and the wear resistance was improved. Meanwhile,Ni-P-CNTs composite coating was brought into epoxy composites surface by electroless plating. It was found that Ni-P-CNTs coating further decreased the wear rate of composites. Thus,combining the addition of carbon nanotubes with electroless plating technology is an effective method to improve the wear resistance of epoxy-based composites.

EXPERIMENTAL STUDY OF DAMPING PROPERTY OF FRP AND FRR COMPOSITE MATERIAL

SUN Yan, LI Wen-xiao, HU Yi-le, LIU Shu-feng

2013, 0(4):  20-23. 

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Previous studies have shown that the rubber isolators can provide better damping performance than the bearings which enhanced by steel plates,so the researchers applied FRP and FRR composite boards to replace the steel plates in the isolators. In order to improve the damping property in isolator,in this article the dynamic mechanical analyze(DMA) tests has been taken to choose the most suitable composite material between the continuous fiber reinforced composite laminates with different matrixes,such as thermosetting resin,thermoplastic resin and rubber for isolator. After compared and analyzed the results,the author considered that the FRR composite board is the best choice of the isolator.

RESEARCH FOR IMPROVEMENT INTERFACIAL PROPERTIES OF THE WINDING OF THIN WALL LONG TUBE

SHI Guo-zhong, WANG Lu

2013, 0(4):  24-27. 

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The article describes the raw material,coupling agent and the pressure influence on the winding of fiber- glass with thin wall long tube.

THE STUDY ON HYGROTHERMAL AGING BEHAVIOR OF COMPOSITES AND THE PREDICTION MODEL OF DURABILITY

SUN Bo, LI Yan

2013, 0(4):  28-34. 

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In this study,the effects of hygrothermal environments on the durability of glass fiber reinforced epoxy composites were investigated including physical and chemical degradation. In order to assess the durability of such systems,an investigation was undertaken in the hydrothermal conditions with different temperatures. Inter-laminar shear test and bending test were obtained periodically to study the mechanical degradation. The moisture absorption response of the composites was also determined over an 80-week period. In addition,scanning electron microscope photos of the composites were obtained before and after aging. The samples were also analyzed by means of Fourier transform infrared spectroscopy (FTIR) to identify degradation products and estimate the influence of glass fiber and polymer on chemical degradation of the studied composites. The result shows in the first stage the weight gain increased gradually over time,and it was in accordance with the Fickian Law,while in the second stage, weight gain of composite dropped down. The flexural properties reduced gradually with aging time,the interface performance was seriously impact. The prediction model was set up based on the time-temperature equivalence principle and experimental data. During the later period of aging,the fracture mode was mainly delamination,so the model was modified by an interface factor,and it showed a quite good agreement with the experimental value.

METHOD OF ABSTRACT EFFECTIVE VIBRATION SIGNAL CHARACTERISTICS BASED ON FRACTAL DIMENSION

MENG Xiang-cheng, YANG Ying-tao, YANG Jian-hui

2013, 0(4):  35-38. 

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The effective extract to vibration signal characteristics is the key technology in the process of dynamic analysis and processing. For the relationships between vibration characteristics and energy,and on the basis of energy characteristics in the procedure of vibration,the ANSYS/LS-DYNA software is used to simulate the dynamic signal under the impulse excitation for anchor bolt. Then the status of free and tension displacement wave is got respectively. The fractal dimension method is used to handle the wave,and the first arrival and integer cycle position is then obtained in MATLAB software. The result obtained from this study is demonstrated the reliability with the method of fractal to extract the valid signal characteristics.

STUDY ON STRUCTURE OF EMBEDDED POSITIONING TOOLING TO OBTAIN THE BUSHING BLADE MAKING ON THE T-BOLT MOLD

LU Tong-hong, GAO Yang, REN Hong-wei, SHI Yi-peng

2013, 0(4):  39-42. 

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Feasibility of embedded bushing blade making tooling was studied which positioned on the T-bolt blade making mold. The new tooling was designed and researched to make the bushing bolt wind turbine blade by matching to the T-bolt mold with the root reinforcement. It was a new way to make the bushing bolt wind turbine blade and the precision of bushing placement was guaranteed in the blade. After the few pieces of prototype was made and realized, the embedded technology on the T-bolt blade making mold was developed,which integrated the T-bolt mold resources idle without to make new bushing blade mold, reducing the production cost.

RESEARCH OF EPOXY RESIN CURING KINETICS AND ITS APPLICATION

LI Heng, WANG De-hai, QIAN Xia-qing

2013, 0(4):  43-50. 

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Differential scanning calorimetry(DSC) analysis including isothermal and non-isothermal method is an effective way to study epoxy resin curing kinetics. The present review intends to summarize the recent progress in the research of epoxy resin curing kinetics via DSC analysis (model fitting and model free method) . The application of epoxy resin curing kinetics in different systems is described. Finally,the paper prospects the future of kinetic studies.

RESEARCH EFFECTS OF METAL PRETREATMENT ON THE BONDING STRENGTH OF METAL/POLYMER INTERFACE

LI Hui, ZHANG Peng, CHENG Yong-qi, SUN You-song

2013, 0(4):  51-54. 

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In order to improve the bonding strength of metal/polymer interface,the bonding strength of metal/ polymer can be affected by surface pretreatments,the effect of various surface pretreatments such as grinding with emery paper,blasting,acid etching,phosphating and sliane coupling agents on the bonding strength by the shearing test are aim to ravel. The surface morphology were analyzed by means of profilometer,super depth three-dimensional microscope and scanning electron microscope (SEM) . The test results show coupling metal pretreatment can strikingly enhance the bonding strength of metal/polymer interface.

THE OPTIMAL STRUCTURE DESIGN FOR THE SUPPORT PLATE OF Ti₃SiC₂/Al₂O₃ CERAMIC MATRIX COMPOSITE

MA Yong-zhong, LIN Jin-bao, WU Feng-hua, WANG Chao

2013, 0(4):  55-57. 

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Based on ANSYS optimization design basic theory,used ANSYS software for simulation analysis,the paper made structure optimization design for the support plate of Ti3SiC2/Al2O3 ceramic matrix composites,and finally got the mine support plate which met the required strength,easy molding and low cost. The paper also provides the basis for the optimization design of support plate in engineering.

THE TECHNOLOGY AND RESEARCH OF STEEL STRUCTURE STRENGTHENED WITH CFRP

CHENG Lu, FENG Peng, XU Shan-hua, MENG Xin-miao

2013, 0(4):  58-62. 

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Fatigue failure is a common failure mode of the steel structure engineering applications. Traditional reinforcement methods improve the fatigue life of components,but it will bring many new problems due to the damage of the original structure. CFRP has lightweight and high strength characteristics. Steel structure strengthened with CFRP has a nice fatigue property. In this paper,the CFRP reinforcing principle,CFRP strengthening methods and CFRP strengthening research at home and abroad were summarized,to help the application of CFRP strengthening in engineering.