COMPOSITES SCIENCE AND ENGINEERING

STUDY ON PREPARATION AND PROPERTIES OF ORGANIC SILICON-EPOXY RESIN MODIFIED POLYURETHANE COATING

FENG Si-jing, GAO Wei-hua

2014, 0(2): 4-8.

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According to the orthogonal experimental design and analysis, certain amount of organic silicone, epoxy resin and related additive agents were combined with the self-made polyurethane pre-polymer, one new kind of organic silicon-epoxy resin modified polyurethane anti-corrosion coating was prepared. The basic formula of the coating was finally determined. The chemical structure and morphology of the coating were analyzed by FTIR and SEM respectively, the thermal behavior of the coating was characterized by thermo-gravimetric analysis, while a series of tests like the impact strength test, tensile strength test, water absorption test, and the acid and alkali resistance test and salt corrosion resistance test were also carried out according to the corresponding government standards. The results showed this new coating proving outstanding behaviors, may realize effective anti-corrosion performance for materials.

FINITE ELEMENT ANALYSIS OF COMPOSITE ENGINE HOOD WITH CARBON FIBER

LI Hao, LUO Jian-lan, LI Wei

2014, 0(2): 9-13.

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Finite element model (FEM) of composite engine hood with carbon fiber was established. The bending stiffness, side bending stiffness and torsion stiffness of the hood were simulated under the conditions of the bending, side bending and torsion. The results from simulation and tests were compared to verify the validation of the FEM hood model. The influence of the composite lay-up on the stiffness of hood has been investigated, it is shown that the stack sequence[±45°] will lead to better stiffness. Orthogonal experiment and the finite element analysis have been combined in this paper, the role of the four engineering constants of laninar (E₁、E₂、ν₁₂ 、G) to the stiffness of hood have also been investigated. It has shown that in-plane shear modulus G₁₂ has large effect on the stiffness of the hood, while the poisson's ratio ν₁₂ has little influcence on the stiffness of the hood.

A STUDY OF THE MECHANICAL PROPERTIES OF CROSS-PLIED UNIDIRECTIONAL UHMWPE SHEETS UNDER QUASI-STATIC LOADING

WEN Yao-ke, XU Cheng, DONG Xue-hua

2014, 0(2): 14-18.

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Cross-plied unidirectional Ultra-high molecular weight polyethylene (UHMWPE) sheets is the main material for the production of soft body armor. At first, the tensile behavior, in-plane shear behavior and punch-shear behavior of UHMWPE sheets under quasi-static loading were studied using experimental method. The experimental show a sudden brittle fracture occurred in the quasi-static tension process, the tensile strength is about 641MPa. A highly non-linear behavior of force-displacement curve was observed during in-plane shear process, plastic hardening occurred in the direction of the tension force and matrix shear failure is the main failure mode. After failure, the angel between fibers in adjacent plies has reduced from 90° to 74°. The through-thickness shear strength is about 168MPa, which was obtained using a set of special clamp. Then shell elements were adopted to establish the finite element model for studying the tensile experiment and punch-shear experiment process numerically. The numerical results are in good agreement with the tensile experiment results in maximum tensile force, tensile strength and failure strain, and the stress contours in the UHMWPE sheets were also obtained; The stress history of elements in the shear failure area were captured using numerical method.

STABLE PERFORMANCE OF FRP TUBE AXIAL COMPRESSION MEMBERS

ZHANG Xing-hu, LIU Yong-hui, FENG Hai-chao

2014, 0(2): 19-22.

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This article is on the basis of the 500kV FRP repair tower model test study. Axial compression test was conducted to several different specifications and different slenderness ratio of FRP tube section members. Axial compression member stability bearing capacity is the key factor influencing the bearing capacity of the members. Based on the study of the stability of the glass steel compression members, get the stable bearing capacity of members.And study their deformation characteristics, failure pattern and stability coefficient. Comparison of the test value of stability coefficient and calculated value from different standards, the writer fitted an axial compression design stability coefficient expression.

FULL-SCALE STATIC TEST ANALYSIS OF LARGE WIND TURBINE ROTOR BLADE

WANG Chao, LI Jun-xiang, ZHANG Shi-qiang, DING Suo

2014, 0(2): 23-26.

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One rotor blade of 1.5MW wind turbine is simulated by finite analysis program in static test condition, to obtain theoretical values of test. Test data collected from the static test of blade are analyzed and compared with theoretical values in compliance with guidelines to get approved by certification agency. Reliability of processing combining with design is verified effectively by a type certificate.

RESEARCH ON ANTI-FAILURE PROPERTIES OF VECTRAN FABRIC COMPOSITES

DU Yi-jun, JIANG Jin-hua, CHEN Nan-liang

2014, 0(2): 27-32.

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To find out the anti-failure properties of Vectran fabric composites, this paper mainly studied the tensile, tearing, impact and abrasion properties of Vectran fabric(uncoated Vectran fabric and coated Vectran fabric), and analyzed the influence of coating process on Vectran fabric. The result shows: Vectran fabric has a low mass and high tensile strength, slippage and breakage of fiber are the main failure mode for the uncoated fabric, while fiber breakage is the main failure mode for the coated fabric. Because of the decrescence of the tear trigonum, the tear force of Vectran fabric is dramatically dropt down after being coated. The impact resistance of coated Vectran fabric is strongly low compared with Vectran fabric. The abrasion property of Vectran fabric is excellent, abrasive dust is uneasy to occur.

AN ANALYSIS OF FUNCTIONALLY GRADED MATERIALS BY THE ISOPARAMETRIC GRADED FINITE ELEMENT METHOD BASED ON ABAQUS

HUANG Li-xin, YANG Zhen-zhen, ZHANG Xiao-lei, YANG Ming

2014, 0(2): 33-39.

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Based on the computing platform of the finite element method (FEM) commercial software ABAQUS, a plane structure of functionally graded materials (FGMs) is analyzed by finite element models which are based on the isoparametric graded finite element method (IGFEM). Numerical example shows that the stress and displacement results by the IGFEM are satisfactorily agreed with the analytical solutions. By designing Young's Modulus nonhomogeneity parameters of material component Y-TZP in three cases, the influence on the FEM solutions is discussed. By the numerical example of the FEM fine mesh, it is found that the IGFEM has high accuracy and better convergence.

RESEARCH ON THE IMPACT OF MARINE ENVIRONMENT ON THE SOUND TRANSMISSION PERFORMANCE OF THE POLYMER MATERIAL

LI An-meng, CHAI Peng-jun, DING Ping, YAN Cheng-lei

2014, 0(2): 40-42.

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The article describes the experiment of sound transmission property of CFRP, GFRP and polyurethane panels, the result shows that the adhered microorganism affects the sound transmission property a lot, the painted one is better than the unpainted one. The transmission coefficient decrease caused by marine ageing is less than 5.2%. GFRP panels show better sound transmission performance.

FEA TO PRESTRESSED CONNECTION STRUCTURE BETWEEN COMPOSITE MATERIAL SHELL AND FRONT SKIRT UNDER AXIAL COMPRESSION

WU Xing, WANG Peng-fei, YOU Shun-tao, XIAO Wen-gang

2014, 0(2): 43-46.

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FEA to prestressed connection structure between composite material shell and front skirt. Through the establishment of physical model to composite material shell under axial compression,then mesh for FEA calculation model, the paper compared the prestressing force intensity ratios of three different interference fit connection structures, and came to a conclusion that to exert a interference fit prestressing force only upon the root of the connection structure between concial composite material shell and front skirt,it has the minimal prestressing force intensity ratio,which connection structure is the most reliable.

EFFECT OF PROCESSING TECHNIC AND SEVEN HOLE HOLLOW POLYESTER FIBERS ON THE FT-IR AND MICRO-STRUCTURE OF CPE-AO 2246

JIANG Sheng

2014, 0(2): 47-52.

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A series of CPE-AO 2246 and SHPF/CPE-AO 2246 damping composites were prepared with chlorinated polyethylene (CPE), 2,2′-methylene-bis-(6-tert-butyl-4-methyl-phenol)(AO2246) and seven hole hollow polyester fibers( SHPF). Hydrogen bond formation and microstructure of composites were measured and investigated by means of FT-IR and SEM. The results showed that new absorption peak was formed in the 3528cm^-1 and 3505cm^-1 in CPE-AO 2246 composite which was made by hot pressing conditions of high temperature. AO 2246 crystals were seen everywhere in CPE-AO 2246 composite without hot-pressed while there were full of CPE-AO 2246 hybrids in hot-pressed CPE-AO 2246 composite; with adding SHPF, new absorption peak was formed in the 758.4cm^-1 and 775.5cm^-1 in CPE-AO 2246 composites, AO 2246 crystal significantly increased, and sub-hybrids were formed by a small amount of AO 2246 compatible with CPE. These constituted evidences of further revealing damping mechanism of the organic hybrid material.

RESEARCH ON SURFACE CONTROL OF LARGE WIND TURBINE BLADE MOLD

LI Yi-quan, PANG Zeng-kai, MENG Zhan-guang, ZHU Kun

2014, 0(2): 53-55.

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With the development of wind power industry, wind turbine blade had been developed from the original kW to the latest 6MW or more. Wind turbine blade mold was manufactured from composite material with vacuum infusion molding process. The mold length was from the initial 10m to 60m or longer, and the surface accuracy became more and more difficult to control. The efficiency of wind power depended directly on the accuracy of blade wing. So high accuracy of mold surface was necessary for the mould to guarantee the high degree of coincidence for actual size and design value. Therefore, surface accuracy control of large wind turbine blade mould was studied.

MANUFACTURING OF COMPOSITE PROTECTIVE COMPONENTS FOR ANTI-EXPLOSION IMPACT

ZHANG Wei, GAO Hong-cheng, ZHANG Wei

2014, 0(2): 56-58.

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The paper studied and discussed the effect of choosing raw materials, design and manufacturing molds, manufacturing process and test method on the anti-explosion properties of a composite protective component. A new composite protective component with excellent performance of anti-explosion impact was successfully manufactured.

THE MOLECURLAR DESIGNING OF ALKALI-RESISTING EPOXY VINYL ESTER RESINS

DAI Hua, ZHOU Run-pei

2014, 0(2): 59-61.

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This paper analyzes different factors which may affect the alkali resistance of fully cured epoxy vinyl ester resins. The testing result shows that not only the density of ester group and the space protection function of its adjacent groups are the major factors of the alkali resistance, but also the crosslinking density and hygroscopicity of the molecular network structure play an important part for the alkali resistance.

EXPLORING THE FACTORS AFFECTING OF THE MACHINING OF COMPOSITE HOLE MATERIAL

LI Xiang-De, PENG Yu-gang

2014, 0(2): 62-64.

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Hole machining processing is the main method of composite hole forming, which is one of the most important factors in the passing rate of the composite products. This paper focuses on the design of hole in composite materials, there are many factors need to be considered: composite structure, structure quality and raw materials, and the choice of the process. Then the influencing factors of composite hole quality also be discussed, which include tooling, cutting tools, human factors and maintenance.

APPLICATION OF CARBON FIBER FAN IN PERFORMANCE IMPROVEMENT OF COOLING TOWER

WANG Yue-feng, MA Xiao-feng, CHEN Hua

2014, 0(2): 65-68.

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Benefit from its high material property, carbon fiber is widely applied in industry. In the cooling tower industry, the tower's performance degrades by lack of air volume especially in high temperature seasons. A high performance carbon fiber fan is installed in one tower of 1st water circulating system, from comparison with lateral tower and with the data before the new fan installed, this article confirms that improving the cooling tower's performance with this method is feasible.

THE MANUFACTURE AND APPLICATION OF COMPOSITE WING SPARS

FANG Yi-wu, WANG Xian-feng, SUN Cheng, XIAO Jun

2014, 0(2): 69-74.

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Wing spars are the main load-carrying structures of the airplane. The developed countries has made various all-composite wing spars in advanced aircraft on the basis of proven processing methods of the Carbon Fiber Reinforced Polymer(CFRP). But domestic research on this aspect has just started, and has not yet formed a perfect and practical manufacturing technology. The paper describes several processing methods of the composites wing spars in advanced aircraft abroad. Furthermore, the paper prospects the research interests in this field may be used as a reference to develop composite wing spars of our country in the future.

THE PROGRESS ON ORGANIC MODIFICATION MONTMORILLONITE ENHANCED RUBBER

WANG Yu-hang

2014, 0(2): 75-77.

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This paper reviewed the methods of preparing organic modification of montmorillonite (OMMT)/rubber, it focused on physical and mechanical properties. Finally, it proposed the future research directions of montmorillonite (OMMT)/rubber composite materials.

Industry information contents

2014, 0(2): 78-112.

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