高频透波玻璃钢天线罩性能的研究

通过对玻璃钢天线罩增强材料基体材料性能的引述,实验分析了不同成型工艺对高频玻璃钢天线罩透波性能的影响,同时对玻璃钢天线罩单板壁厚进行研究,通过试验论证产品中采用不同高度的蜂窝对高频天线罩的影响。     

651天线罩RTM成型工艺研究

本文着重阐述了６５１天线罩选择的成型工艺及材料，同时对６５１天线罩的ＲＴＭ成型工艺过程，工艺特点，基本原理及工艺质量控制做了简介，研究表明用ＲＴＭ成型的６５１天线罩性能良好，树脂含是珂控制至２８％，天线罩的电性能重复性好。     

浅谈出口巴基斯坦铁路客车新型酚醛玻璃钢风道的研制开发

本文阐述了新型酚醛玻璃钢风道的成型工艺、开发过程，并与传统玻璃钢风道作了比较，论述了新型酚醛玻璃钢风道的优点，并对其应用前景和对铁路客车的设计思路的影响进行了探讨。     

卫星天线罩的手糊工艺研究

通过对手糊工艺特点的分析,合理选用原材料、成型方法和成型工艺流程,解决了原先手糊成型卫星天线罩中树脂粘度高、产品超重、产品表面不光滑和气泡难以消除等问题,摸索出了一种制作卫星天线罩的手糊成型工艺。     

复合材料闭模成型工艺在天线罩上的应用研究

复合材料闭模成型工艺技术具有成型产品性能优良、质量稳定、生产效率高和环境友善等诸多特点,本文对复合材料天线罩产品采用闭模成型工艺的应用材料、树脂流动、充模过程和适用情况进行了阐述和说明.天线罩产品采用闭模成型工艺,选择满足其性能和工艺双重特性的材料非常重要,通过树脂流动趋势和仿真分析来指导工艺设计,可有效的避免工艺实施...     

新型玻璃钢锚杆成型工艺研究

本文通过对玻璃钢锚杆性能特点及现有玻璃钢锚杆成型工艺的分析,提出了一种新型玻璃钢锚杆成型工艺-间歇式拉挤锚尾后固化成型工艺,并对生产出的杆体进行了试验研究,杆体的各项性能指标均达到和超过了国家标准,具有推广应用价值。     

酚醛玻璃钢矩形贮槽的研制及应用

本文介绍了手糊成型酚醛玻璃钢矩形贮槽的结构设计，成型工艺及应用情况。     

玻璃钢成型工艺对玻璃纤维质量要求分析

简要介绍了常见玻璃钢成型工艺对玻璃纤维性能及质量的基本要求。分析了原丝性能与质量对玻璃钢成型工艺的影响,并对造成原丝质量下降的原因进行了讨论,提出一些建议。     

玻璃钢座椅成型工艺及基本性能

本文探讨了对模法玻璃钢座椅的成型工艺，对座椅的基本性能进行了分析。     

关于蜂窝夹层结构雷达罩连接的分析

地面雷达天线罩的表面积很大，必须分块成型，然后再采用接头连接成整体，因此接头的设计，加工和安装对雷达天线罩的安全使用极其重要。本文介绍了蜂窝夹层结构雷达罩夹层结构的连接方式、连接工艺、接头设计原则与安装方法，并给出了一些建议。     

SCRIMP在酚醛复合材料中的应用

随着列车火灾事故的增多和轨道交通的大规模建设，列车的防火要求日益严格。酚醛树脂以其难燃、低发烟、耐热的优点被大量使用。SCRIMP成型技术的应用极大地提高酚醛玻璃钢的施工性能。本文介绍了TM-PF3010酚醛树脂在SCRIMP成型技术中的应用。     

SCRIMP用原位分相增韧中温环氧树脂体系制备及复合材料性能

针对复合材料真空辅助树脂浸渍模塑技术(SCRIMP)对树脂体系要求进行配方设计及性能测试。采用动态差示扫描量热(DSC)法,运用Kissinger动力学方程研究了基础树脂的固化反应动力学。通过添加QS-VA-3型原位分相型增韧剂,改善了基础树脂脆性,依据力学性能测试结果确定最佳添加量。对增韧环氧树脂体系进行等温/非等温黏度特性研究,确定了SCRIM P灌注成型过程的适用期,并使用该技术成型了增韧环氧树脂体系/单向玻璃纤维布复合材料试样,发现与玻璃纤维复合后具有强度高、界面性能好及低电压绝缘性能良好特点,但牺牲了高电压环境下绝缘性能。     

玻璃钢壳体电子性能预测技术研究

研究目的为通过人工神经网络方法预测玻璃钢天线罩的电子性能.建立具有非线性逼近能力的径向基函数(RBF)神经网络,根据试验得到的不同厚度玻璃钢平板,不同入射角的透波率数据,对神经网络进行训练.按照给定的玻璃钢天线罩内外表面数据计算入射角范围和罩壁厚度,并对玻璃钢壳体进行电子性能预测.计算结果与试验数据十分近似,表明该方法预测精度高,训练速度快,为玻璃钢电子性能设计和分析提供了一种实用有效的方法.     

基于RBF的玻璃钢天线罩逆向工程曲面重构

研究目的是通过人工神经网络方法重构玻璃钢天线罩曲面。径向基函数(RBF)神经网络具有很强的非线性逼近能力,根据给定的天线罩外表面数据及采集的天线罩内表面数据,采用RBF神经网络对玻璃钢天线罩进行逆向工程曲面重构。典型工程实例的计算结果证明,该方法的拟合、重构精度高,并且训练速度快,具有很高的实用推广价值。     

Low temperature cure of vinyl ester resins

Vinyl ester resins are well known for their versatility as a composite matrix. With the development of a promising room temperature molding technology, vacuum-assisted resin transfer molding, e.g. Seemann Composite Resin Infusion Molding Process (SCRIMP), the processability of vinyl ester resins at low temperatures has attracted considerable attention from the composite industry. The objective of this paper is to provide a better understanding of the reaction kinetics of this resin system at low temperatures. In this study, a differential scanning calorimeter (DSC) coupled with a Fourier transform infrared (FTIR) spectrometer was employed to measure the reaction profile of a vinyl ester resin with different promoter and styrene contents. A kinetic model based on the free radical co-polymerization mechanism was developed for simulating the reaction rates and conversions of styrene vinyl and vinyl ester vinylene groups. The model parameters were determined from several FTIR experiments under isothermal conditions. This model, in conjunction with heat transfer analysis, was able to successfully predict the temperature profiles during curing in two SCRIMP molding cases based on groove type resin distribution system.     

聚苯硫醚在天线罩上的应用研究

采用注射成型的方法制备出某弹载聚苯硫醚(PPS)天线罩。介绍了弹载天线罩对材料性能的要求、PPS的特性,以及PPS天线罩的注射成型过程、后处理过程,并比较了PPS天线罩与聚四氟乙烯(PTFE)天线罩的性能。结果表明,PPS天线罩的可制造性、尺寸稳定性等综合性能优于PTFE天线罩。     

树脂基复合材料成型工艺研究进展

主要综述了树脂基复合材料的几种成型工艺,包括RTM、VARTM、CRTM、LRTM、RFI、VARI、SCRIMP、SRIM、TERM,各自的发展现状、成型原理、特点等.     

Vacuum‐assisted resin transfer molding using tackified fiber preforms

A low cost composite fabrication process—tackified SCRIMP—is described for fabricating aerospace‐grade composites based on tackification and vacuum‐assisted resin transfer molding (VARTM). Tackification based on a commercial tackifier (FT 500 from 3M) was used to make the net‐shape fiber preform. It was found that tackifier concentration and application conditions play important roles in governing the moldability of tackified fiber preforms. An epoxy resin (PR 500 from 3M) was used in the VARTM process‐SCRIMP at high temperatures. Experimental results show that composites with high fiber content (> 60% by volume) can be manufactured at low cost using tackification. Effects of tackification methods on composite dimension control, void content and mechanical properties were investigated and compared in both RTM and SCRIMP.     

Mold filling analysis in vacuum-assisted resin transfer molding. Part II: SCRIMP based on grooves

Compared with SCRIMP based on the high-permeable medium, SCRIMP based on grooves has the advantage of a much higher mold filling rate. This paper analyzes the influences of various molding conditions on mold filling and presents models that can be used to predict the filling time and flow pattern in SCRIMP based on grooves. Mold filling experiments were carried out to investigate the effect of various factors such as the size of the groove, groove spacing, number of fiber layers and resin viscosity on mold filling. A leakage flow model was developed to simplify the simulation of the mold filling process in SCRIMP based on grooves. An “equivalent permeability” was introduced to represent the average flow capacity in the grooves. Compared with the Control Volume/Finite Element Method (CV/FEM) model, the leakage flow model greatly reduced computation time and yet provided simulation results that were in good agreement with experimental observations.     

A kinetic model for free‐radical crosslinking co‐polymerization of styrene/vinylester resin

Vinylester resin is a major thermoset polymer used In low temperature composite manufacturing processes, such as the Seemann Composite Resin Infusion Molding Process (SCRIMP). In this study, the effect of temperature on the cure kinetics of vinylester resin in the range of 35 to 90°C was investigated using a differential scanning calorimeter (DSC) and a Fourier transform infrared spectrometer (FTIR). A mechanistic kinetic model was developed to simulate the reaction rate and conversion profiles of vinylester vinylene and styrene vinyl groups, as well as the total reaction action rate and conversion. Experimental results from DSC and FUR at different temperatures were compared with model predictions. The glass transition temperature of the vinylester resin cured at different temperatures was identified and used to monitor the final conversion change. A series of SCRIMP molding experiments were conducted. The developed kinetic model in conjunction with a heat transfer model was used to simulate the temperature and conversion changes inside the SCRIMP‐molded composites.