COMPOSITES SCIENCE AND ENGINEERING

MECHANICAL BEHAVIORS OF BASALT FIBER REINFORCED POLYPROPYLENE COMPOSITES

ZHOU Hong-tao, LIU Hua, WANG Shu-dong, SUN Jian

2014, 0(3): 4-7.

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This paper studied the mechanical properties of the basalt reinforced polypropylene composite, prepared four kinds of the fiber-reinforced composite materials that basalt fiber content were 10%, 20%, 30% and 40%, and analyzed the influence of fiber content on the tensile and flexural properties of composites. Research shows that: basalt fiber is helpful to improve the tensile and bending properties of the composites, but the elongation at break decreased; With the increase of the basalt fiber content, the tensile strength and tensile modulus was first increased and then decreased when the fiber content of 30% up to a maximum; the flexural strength and modulus increases with increasing of fiber content. The flexural strength and modulus had the same tendency with the tensile properties.

PATH PLANNING FOR COMPOSITE FIBER PLACEMENT

YIN Ji-long, SHEN Jing-feng, ZHANG Zhi-dong

2014, 0(3): 8-12.

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Targeting at solid of revolution component of composite, presenting the fiber placement path planning algorithm for solid of revolution component. The model of fiber placement path planning based on cubic spline interpolation is founded by using the mathematical model of pipe. The paper first discussed that get the mandrel′s center line equation by cubic spline interpolation, then found the mandrel′s parametric suface equation, and at last proposed a novel path generation algorithm which is appropriate for the solid of revolution component. The path generated by this algorithm is satisfy the process requirements and engineering need in practice after example verification by MATLAB.

THE INFLUENCE OF MICROSTRUCTURE OF 3D ANGLE-INTERLOCK WOVEN COMPOSITE ON THE FATIGUE BEHAVIOR UNDER THREE-POINT BENDING

YANG Ge, PAN Zhong-xian

2014, 0(3): 13-17.

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This paper presents the finite element simulation of 3D angle-interlock woven composite(3DAWC) undergoing three-point bending cyclic loading. The finite element solid model was built in accordance with the real structure of layer-to-layer 3DAWC. Based on inelastic hysteresis energy fatigue damage criterion, deformation and stiffness degradation of 3DAWC under three-point bending cyclic loading were caculated by FEM. The interior deformation and stress distribution characterisics of 3DAWC during the fatigue process were anaylsed and it was found that the most of the load was carried by warp yarns.The different failure mechanisms of yarns and resin were also discussed and the influence of microstructure was discovered. The results and research method can be applied to engineering structure design of 3D woven composite.

EFFECT OF PROCESSING TECHNIC AND SEVEN HOLE HOLLOW POLYESTER FIBERS ON THE DYNAMICAL THERMAL MECHANICAL AND MECHANICAL PROPERTIES OF CPE-AO 2246

JIANG Sheng

2014, 0(3): 18-22.

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A series of CPE-AO 2246 and SHPF/CPE-AO 2246 damping composites were prepared by using chlorinated polyethylene (CPE)、2,2′-methylene-bis-(6-tert-butyl-4-methyl-phenol)(AO2246) and seven hole hollow polyester fibers( SHPF). Dynamic and static mechanical properties of composites were measured and investigated by means of DMA and HD026NE electronic fabrics tensile tester. The results show that storage modulus of hot-pressed CPE-AO 2246 obtained increase at low-temperature platform area, and low-temperature platform area shifted to high temperature, Especially, storage modulus of high temperature hot-pressed CPE-AO 2246 obtained a sharp improvement; the peak of loss modulus obtained a large increase; obdurability and toughness of hot-pressed CPE-AO 2246 obtained certain to improve. Platform area of storage modulus of CPE-AO 2246 composites shifted to the direction of high temperature and maximum storage modulus increased sharply with adding fiber, the peaks of storage modulus and loss modulus increased with the increase of fiber content; stress of SHPF/CPE-AO 2246 increased and strain decreased with the increase of fiber content. These provided performance security to make SHPF/CPE-AO 2246 composites into engineering application.

INVESTIGATION ON HYDANTOIN EPOXY RESIN SYSTEM MOULDING BY VARI

ZHANG Lian-wang, BAO Jian-wen, ZHONG Xiang-yu

2014, 0(3): 23-26.

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An epoxy resin system consisting of hydantoin epoxy resin and amine cure agent was designed, which was cured at high temperature. The flowing characteristics of this epoxy resin system were analysed by rheometer. The mechanical properties of this resin system and its composite were tested. The moisture absorption characteristics was investigated. The results demonstrated that this epoxy resin system took on excellent molding properties and good mechanical properties, so it was appropriate for LCM. High moisture absorption and badly property in wet-and-hot conditions were problems facing this epoxy resin system.

RESISTANCE TO ACID AND ALKALI OF VECTRAN FIBER

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

2014, 0(3): 27-31.

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In order to study Vectran fiber′s ability to resist acid and alkali and provide necessary information for its application, sulfuric acid and sodium hydroxide with different concentration were chosen to process Vectran fiber. After that, the fiber′s weight loss, breaking strength and superficial morphology were tested. The results revealed that the difference of weight loss between sulfuric acid and sodium hydroxide process was very little, only concentrated sulfuric acid could cause a very serious corrosion on the fiber′s surface; the breaking strength of Vectran filament wasn′t affected a lot by the sulfuric acid and sodium hydroxide, only the concentrated sulfuric acid could damage the fiber; SEM showed the sulfuric acid and sodium hydroxide′s process led the surface of Vectran fiber to generate longitudinal grooves, the density and depth of these grooves related to the sulfuric acid and sodium hydroxide′s concentration and the process time and the process of sulfuric acid could cause a more obvious superficial damage.

EFFECT OF SALVATION AND SUSPENDING MEDIUM ON THE RHEOLOGICAL PROPERTIES OF SHEAR THICKENING FLUID (STF)

JING Xiao-ying, LU Zhen-qian

2014, 0(3): 32-35.

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The effect of salvation and suspending medium of PEG200, PEG400, PEG/Gl on the rheological properties of shear thickening fluid (STF) were studied with a rheometer. The results show that single suspending medium on the thickening effect are better than compound suspending medium. Compared with the critical shear rates, they showed PEG400<PEG200<SiO₂/PEG400/Gl<SiO₂/PEG200/Gl, so the larger PEG molecular weight with single dispersing medium, the better shear thickening effect has. In addition, with higher mass faction of SiO₂, the shear thickening effect is more obvious. Therefore, under small shear rate the high mass faction can be chosen to get better thickening effect.

FINITE ELEMENT ANALYSIS OF IMPACT BETWEEN PEDESTRIAN HEAD IMPACTOR AND ENGINE HOOD

LI Hao, LUO Jian-lan, LI Wei

2014, 0(3): 36-40.

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Finite element model (FEM) of the impact between head impactor and carbon fiber sandwich composite was established. The head injury criterion (HIC) has been calculated by using the software DIAdem. The model has been verified to be valid through the steel ball impact experimnet. The numbers of layers, the thickness of foam, the stack sequence, their role on the HIC and deformation have been investigated. It was shown that adding the foam could save the quantity of CFRP without increasing the HIC and deformation; Too large or too small foam thickness is not good for pedestrian protection, it has a optimal value; Isotropic lay-up will leads to a low HIC.

CREEP BEHAVIOR PREDICTION FOR COMPOSITE CORE OF NOVEL ELECTRIC CONDUCTOR

LAN Feng-tao, CHEN Xin, WANG Ying-nan, YANG Chang-long

2014, 0(3): 41-44.

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Hybrid composite rods, comprised of unidirectional reinforcing carbon/glass-fiber and adhesive epoxy matrix, are viewed as promising candidates to be used in high-voltage overhead conductors. However, before widespread application, their long-term durability needs to be clarified. In this study, accelerated creep testing for hybrid composite rods, both fully-cured and unfully-cured ones, is presented by taking dynamic mechanical analysis tests at different temperatures. Using the time-temperature superposition principle and thermal activation energy theory, the short-term creep data are combined to generate creep long-term compliance master curves. Through the master curve, predictions can be made concerning the creep levels that will occur during the design lifetime of hybrid composite rods (i.e., 30 years). It is found that after 30-year service at 120, fully-cured hybrid composite rods only exhibit a slight increase in compliance (about 5%), indicating a satisfactory creep resistance at this temperature.

PREPARATION AND PROPERTIES OF EPOXY RESIN SYSTEM FOR VARI

CHAI Hong-mei, DING Yong-gang, HU Xue-chang

2014, 0(3): 45-47.

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Epoxy resin system for VARI was prepared by mixing modified CYD128 ,modified amine and active diluents. And the properties were studied. The results showed the epoxy resin system had lower viscosity(0.285Pa·s ), long pot life (2h,1pa·s ) at 28℃, good mechanical properties ,and can meet the requirements for VARI.

STUDY ON TECHNOLOGY OF COMPOSITE AIR CONDUIT FOR AIRCRAFT

ZHOU Xiao-feng

2014, 0(3): 48-51.

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The component structure of composite air conduit is carbon fiber/honeycomb core interlayer structure, and the appearance is loop-locked, variable cross-section, double curving cavity posture part. Based on the research, the complex surface composite mould-designing technology and forming process was studied. The composite air conduit has been made and it has met the product design reqirement. The design method and the forming process can give a reference on complex surface composite product forming.

DESIGNING OF METAL-RESIN COMBINED MOULD

LI Xiang-de, PENG Yu-gang

2014, 0(3): 52-53.

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The mould plays a key role in the composite product modeling. In this paper, a cylindrical body composite products for a typical shapes were studied, and designed a composite mold making for metal and resin two kinds of material, which was simple structure, low production cost , in compare with the split mold designed by the metal material, which provides a design ideal for composite mold design workers.

QUALITY CONTROL IN INSTALLATION PROCESS OF HIGH PRESSURE FIBERGLASS REINFORCED PLASTICS PIPE

BIAN Hai-bin, LI Hou-bu

2014, 0(3): 54-57.

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High pressure fiberglass reinforced plastics pipe (GRP) had been widely used in the crude oil gathering and transferring, sewage back, polymer and other fields. There are many key processes for the GRP from the factory to the actual use, and every process plays an important role on the safety of the whole pipeline. In order to make use of GRP in the crude oil gathering and transferring, sewage back, polymer and other fields, the paper combined with the standards and on-scene experience, discussed every key point such as handling, digging, laying, fastening, pressing, filling, operating, etc, in the fixing process of the whole pipeline in order to have a better usage in the oilfield.

DRAWING RENSION AND FILOPLUME INFLUENCING FACTOR OF E-GLASS FIBER

SU Zhong-hua, YU Xiang, GAO Zheng-yuan, YUN Teng

2014, 0(3): 58-60.

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This paper describes the characteristics, uses, quality impact factors of glass fiber, and the development process of China′s glass fiber. The effects of e-glass fiber drawing tension were studied by experiment on location of Oiling device, types of under cluster device, shapes of Cable device, distances of drawing machine, sizes of wire-wound tube and sizes of Cooler. Filoplume testing was conducted on yarn D450 obtained under different conditions. The best take-up process of e-glass fiber was confirmed by analysing the relationship between drawing tension, filoplume quantity and drawing process.

IMPACT OF PARTITION HEIGHT BETWEEN MODULES ON AIR VOLUME ASSIGNMENT OF CROSS-FLOW COOLING TOWER GROUP

ZHANG Li-xin, MA Hong-yu, LIU Yue, JI Xiang-yu

2014, 0(3): 61-65.

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When air valves are installed at outlet of mechanical cross-flow cooling tower group, part of fans can stop to reduce energy comsumption under low load. To study impact of partition on air volume assignment of cooling tower group with air valve and get better size of partition, cold-state flow field of mechanical draft cross-flow cooling tower group has been simulated, and experiments have been done to prove the reliability of the method. Flow fields of tower group have been compared with five kinds of partitions: no partition, 1/4 height partition, 1/2 height partition, 3/4 height partition and sealing. This paper has analyzed the air volume balance between modules, variation rule of total air volume and uniformity of inlet air volume distribution of module without fan running. Number of modules beside single module running under different height partition mentioned above respectively are 6, 4, 4, 2 and 0, and air volume of those modules are not less than 10% of the module running. Along with the increase of partition height, total air volume first increases and then decreases; air volume balance between modules becomes worse; inlet air volume uniformity of module without fan running becomes better. Take all thought into consideration, 1/2 height partition is better.

THE APPLIED STUDY FOR THE COMPOSITE POLE AND TOWER OF DOMESTIC TRANSMISSION LINE

HUANG Han-liang, ZHANG Zi-chao, LIN Feng

2014, 0(3): 66-70.

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Transmission pole and tower is the important support structure of power overhead lines facilities. Glass fiberglass reinforced plastic has been gradually applied to transmission line construction in China because of its excellent comprehensive performance. This paper mainly reviews the typical pilot programs of composite materials pole and tower transmission lines in Beijing Fangshan, Beijing Qinglonghu, Zhejiang Zhoushan and Shenzhen. In addition, the other pilot projects in Jiangsu Lianyungang, Nanjing, Fujian are also introduced. This paper surveys the pilot programs through the structure, technology and operation of composite materials tower. At last, the technology development direction of composite pole and tower is presented.

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