纤维增强复合材料装甲防护性能影响因素分析研究

本文从树脂基体、增强材料以及成型工艺等多方面采用正交试验设计开展了舰船防护用纤维增强复合材料研究工作,分析了各因素对复合材料装甲材料防护12.7 mm穿燃弹性能的影响,找出了较优的树脂配方、增强纤维以及成型工艺参数。     

RTM成型工艺对复合材料制品性能的影响

RTM(树脂传递模塑的简称)成型工艺是一种将树脂注入闭合模具中浸润增强材料的复合材料成型工艺。工艺参数对复合材料制品性能有很大的影响。本文对注射压力、注射温度、真空辅助、注胶口和排气口的位置、纤维含量和结构等工艺参数对复合材料制品性能的影响进行了概述。     

VARI工艺成型纤维增强树脂复合材料层合板厚度和纤维体积分数的影响因素

分析了影响真空辅助成型技术（VARI）工艺成型复合材料的纤维体积分数和厚度均匀性的关键因素,即VARI成型工艺的树脂流动控制形式、纤维预制体状态、织物状态、树脂黏度,通过试验分析了各因素对VARI成型复合材料厚度和纤维体积分数的影响。试验结果表明,采用HFVI（high fiber-volume vacuum infusion）工艺、BA9914树脂及真空处理后的U3160单向机织物成型的纤维增强树脂复合材料层合板,其纤维体积分数和厚度均匀性能够接近预浸料/热压罐成型的复合材料制件的水平。     

连续纤维增强高性能热塑性树脂基复合材料的制备与应用

连续纤维增强高性能热塑性复合材料以轻质高强、良好的抗冲击性能、成型周期短、可二次成型、废料可回收再利用等独特优点,逐渐受到复合材料工业界的关注。本文从常用的几种高性能热塑性树脂基体为起点,对连续纤维增强高性能热塑性复合材料应用现状进行介绍,并详细阐述了连续纤维增强高性能热塑性复合材料的成型及性能研究。在此基础上,从应用需求、成型工艺、材料性能三方面总结了国内连续纤维增强高性能热塑性复合材料的未来发展趋势,以期推动连续纤维增强高性能热塑性复合材料的结构设计和应用。     

石英纤维增强磷酸铬铝/有机硅杂化树脂基复合材料性能

通过甲基三乙氧基硅烷(MTEOS)在磷酸铬铝中水解制备了磷酸铬铝/有机硅的有机-无机杂化树脂,以石英纤维为增强材料,氧化铝为固化剂,采用模压成型工艺制备纤维增强杂化树脂基复合材料.考察了杂化树脂基体以及复合材料的力学、介电性能等,结果表明复合材料的弯曲强度大大提高,介电性能更加优越.     

增强双马来酰亚胺树脂基复合材料研究

石英纤维增强双马来酰亚胺树脂复合材料具有低介电损耗、耐高温、耐湿热及良好的力学性能。本文介绍了改性双马来酰亚胺树脂的分子结构与性能,及复合材料的模压成型工艺。     

制备工艺对单向连续碳纤维增强聚醚砜复合材料层间结合强度的影响

采用溶液浸渍和热压成型制备了以聚醚酚为基体的单向连续碳纤维增强复合材料,研究了不同树脂浓度和热压工艺参数下复合材料的层间剪切强度。结果表明:成型温度高的复合材料具有较高的层间剪切强度,适当延长保温时间能够大幅度提高复合材料的性能。扫描电镜和热重分析表明树脂基体与碳纤维之间结合紧密,不同树脂含量的复合材料在热压成型过程中,界面处有不同的作用机理。     

玻璃纤维复合材料的发展及其着色

树脂基复合材料1932年在美国出现,1940年以手糊成型制成了玻璃纤维增强聚酯军用飞机的雷达罩。其后不久,美国莱特空军发展中心设计制造了一架以玻璃纤维增强树脂为机身和机翼的飞机,从此纤维增强复合材料开始受到军界和工程界的注意。1946年纤维缠绕成型技术在美国出现,为纤维缠绕压力容器的制造提供了技术贮备。1949年研究成功玻璃纤维预混料并制出了表面光洁,形状准确的复合材料模压件。1950年真空袋和压力袋成型工艺研究成功,并用复合材料制成直升飞机的螺旋桨。上世纪60年代美国利用纤维缠绕技术,制造出大型固体火箭发动机的壳体,为航天…     

短炭纤维增强聚芳醚酮复合材料的研究

采用短炭纤维（ＳＣＦ）增强聚芳醚（ＰＥＫ－Ｃ）树脂,研究了不同的预混方法、纤维的表面处理、纤维的含量、成型温度和成型压力对复合材料性能的影响。优化了ＳＣＦ／ＰＥＫ－Ｃ复合材料的成型工艺。     

乙烯基酯树脂复合材料的固化过程研究

复合材料固化是成型过程中关键步骤之一,涉及到模具设计,成型工艺确定等.本文采用等温DSC分别研究了玻璃纤维/乙烯基酯树脂,碳纤维/乙烯基酯树脂复合材料和乙烯基酯树脂的固化过程.结果表明:玻璃纤维的存在加速了乙烯基酯树脂的固化速度,而碳纤维的存在使得乙烯基酯树脂的固化速度变慢,纤维增强材料的存在提高了树脂的固化度.     

纤维网格增强超高韧性水泥复合材料加固混凝土圆柱受压性能试验

为提升纤维增强聚合物复合材料（FRP）在加固材料中的优势和发挥效率,同时克服传统纤维网格增强砂浆的抗裂性差的缺点,将超高韧性水泥基材料（ECC）替代砂浆作为FRP网格无机黏结剂的新型复合材料已被提出,但仍缺乏相关的基础研究。本文以新型聚乙烯型ECC为基材,重点研究FRP grid/ECC加固混凝土柱的加固机制。以标准混凝土圆柱为试验对象,采用新型ECC材料为基材的FRP grid/ECC复合材料,以不同强度素混凝土、不同网格材料（玄武岩纤维增强聚合物复合材料（BFRP）与碳纤维增强聚合物复合材料（CFRP）网格）为试验变量,研究了该加固方式下对混凝土轴心受压性能的影响。试验结果表明,该加固方法可有效改善素混凝土脆性压溃破坏模式,提高峰值强度及受压延性。基于FRP grid/ECC材性特征,提出两阶段FRP grid/ECC加固机制,并基于该机制提出加固素混凝土圆柱承载力计算方法。      

Effect of abrasive jet process parameters on machining glass fibre reinforced polymer composite

An experimental and theoretical research work on abrasive jet machining of glass fiber reinforced polymer composite materials was conducted using abrasive jet machining setup fabricated in our workshop. The objective of this research work is to machine holes on the glass fiber reinforced polymer composite using an abrasive jet machine under various levels of process parameter. The material removal rate and hole geometry (kerf analysis) were observed as a part of the investigation. Four factors five levels central composite rotatable design matrix was used for optimizing the required number of experiments. The objective of the present investigation is to develop mathematical models using the response surface methodology. The adequacy of the models has been checked using the ANOVA technique. Use of the developed mathematical models, material removal rate and hole geometry of the machined glass fibre reinforced polymer composite helps prediction at 95% confidence level.     

连续纤维增强树脂复合材料纵向压缩强度预测模型的发展及其影响因素

基于高强、高韧、高模和压拉平衡为特征的第三代先进复合材料的需求,综述了连续纤维增强树脂复合材料纵向压缩强度预测模型的发展历程。基于纤维微屈曲、纤维扭结带、联合预测模型及渐进损伤失效模型,分别讨论了连续纤维增强树脂复合材料压缩失效机制,并在联合预测模型基础上,探究了碳纤维（直径、模量、体积分数、初始偏角）、树脂基体（弹性模量、剪切模量）及纤维/树脂界面三要素对连续纤维增强树脂复合材料纵向压缩强度和压缩失效形式的影响。      

Mechanical property evaluation of sisal–jute–glass fiber reinforced polyester composites

The composite materials are replacing the traditional materials, because of its superior properties such as high tensile strength, low thermal expansion, high strength to weight ratio. The developments of new materials are on the anvil and are growing day by day. Natural fiber composites such as sisal and jute polymer composites became more attractive due to their high specific strength, lightweight and biodegradability. Mixing of natural fiber with Glass-Fiber Reinforced Polymers (GFRPs) are finding increased applications. In this study, sisal–jute–glass fiber reinforced polyester composites is developed and their mechanical properties such as tensile strength, flexural strength and impact strength are evaluated. The interfacial properties, internal cracks and internal structure of the fractured surfaces are evaluated by using Scanning Electron Microscope (SEM). The results indicated that the incorporation of sisal–jute fiber with GFRP can improve the properties and used as a alternate material for glass fiber reinforced polymer composites.     

High Velocity Impact Response of Composite Lattice Core Sandwich Structures

In this research, carbon fiber reinforced polymer (CFRP) composite sandwich structures with pyramidal lattice core subjected to high velocity impact ranging from 180 to 2,000 m/s have been investigated by experimental and numerical methods. Experiments using a two-stage light gas gun are conducted to investigate the impact process and to validate the finite element (FE) model. The energy absorption efficiency (EAE) in carbon fiber composite sandwich panels is compared with that of 304 stainless-steel and aluminum alloy lattice core sandwich structures. In a specific impact energy range, energy absorption efficiency in carbon fiber composite sandwich panels is higher than that of 304 stainless-steel sandwich panels and aluminum alloy sandwich panels owing to the big density of metal materials. Therefore, in addition to the multi-functional applications, carbon fiber composite sandwich panels have a potential advantage to substitute the metal sandwich panels as high velocity impact resistance structures under a specific impact energy range.     

溅射镀铝碳纤维质量的研究

针对制取C／Al复合材料、C／Al间润湿与结合牢固度问题，以及CVD法涂Al在高温损伤碳纤维等难题，采用磁控溅射镀加溅射离子镀膜方法，在碳纤维表面镀Al膜。系统地研究了碳纤维镀Al的界面变化、组分分布、受热强度变化等内容，讨论C／Al复合材料的复合工艺问题。研究结果表明，磁控溅射法碳纤维镀Al膜表面光洁、均匀、规整、C／Al润湿、结合牢固，无化学反应损伤碳纤维现象。镀铝碳纤维受热后拉伸强度稍有降低，但无化学反应及生成Al4C3的现象。研究结果能给C／Al复合材料的制备创造工艺条件。     

Influence of fullerene on the rheological characteristics of melts of the polyamide composite forming the structure of a semi-interpenetrative polymer mesh

The time change in the melt viscosity of the polyamide composite forming at the final stage a polymer with the structure of a semi-interpenetrative polymer mesh has been investigated. To impregnate with the composite melt the carbon fiber for forming carbon-filled plastics, it is necessary to preserve the low viscosity of the melt for a long time. This is achieved by preliminary heat treatment of the composite and introduction of fullerene into it. __________ Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 78, No. 5, pp. 109–113, September–October, 2005.     

车用CFRP油底壳的结构与制造工艺并行优化设计

为实现碳纤维增强复合材料（carbon fiber reinforced polymer,CFRP）油底壳的替代与制造,结合复合材料铺层可制造性分析软件FiberSim与铺层结构优化模块Optistruct,对CFRP油底壳开展了结构与制造工艺并行优化设计。参照CFRP壳体类零件的成型过程,采用FiberSim软件制定了满足制造工艺要求的CFRP油底壳铺覆方案。并在此基础上,分别以CFRP油底壳刚度最大、质量最小为优化目标,以振动模态、制造工艺要求为约束,采用Optistruct模块对CFRP油底壳的铺层结构进行优化设计。经仿真分析验证,制造工艺调整后的CFRP油底壳满足各项替代要求,且CFRP油底壳的质量较原金属油底壳减小了56.7%。所提出的结构与制造工艺并行优化设计方法可较好地兼顾结构特征、复合材料设计及制造工艺要求,为复合材料产品的优化设计提供了参考。     

Experimental investigation on the ball burnishing of carbon fiber reinforced polymer

The polymer-based materials are generally used in all industrial applications. Even if polymer bars can be machined easily, they need surface finishing treatment after the machining process. The ductile properties make coarse roughness on the surface that causes the elastic structure of polymer materials. The carbon fiber reinforced composite materials differ from polymer-based materials by high strength and stiffness. Its structure exhibits similar performances such as metallic materials. The effect of ball burnishing on the surface quality of rod workpiece was investigated in this study. To enhance the surface quality of high strength carbon fiber reinforced polymer rod workpiece, burnishing process was performed in three different parameters (force, feed rate, number of passes) and under four different mediums (dry, wet, boron oil, and mineral oil) conditions. The results of the experiments were analyzed, and optimum burnishing parameters were determined and discussed in detail. The best surface roughness value of the CFRP material used in the experiments was obtained as burnishing force: 250 N, feed rate: 0.05 mm/rev, four passes and wet medium. According to the results of variance analysis, it was found that the CFRP workpiece is the important leading factor for surface roughness with a contribution ratio of 62.47%.     

3-D stamp forming of thermoplastic matrix composites

In this investigation a mould with hemispherical cavity and 80 kN hydraulic press, allowing variable stamping speeds, are employed for experimentally studying of the 3-D stamp forming process of continuous fiber reinforced thermoplastic laminates. In particular, glass fiber (GF) reinforced polyetherimide (PEI) woven fabric made of sheath surrounded, polymer powder impregnated fiber bundles manufactured by Enichem, Italy, is used. Pre-consolidated laminates are heated by contact heating in an external heater up to about 120°C above the glass transition temperature (T _g) of the polymer matrix; they are then stamp formed in a cold matched metal tool. Typical cycle times (including preheating time of the preconsolidated laminates) are in the range of 3 min. Useful processing conditions, such as stamping temperature, stamping velocity and hold-down pressure required for stamp forming of this composite are determined. In addition the effect of die geometries (deformation radian) and original laminate dimensions are studied. The results describe the correlations between processing parameters and fiber buckling. Finally the thickness distribution in stamped parts are investigated in relation to different directions of fiber orientation.