湿法制造热塑性片材的工艺技术研究Ⅰ.热塑性片材概论

本文介绍了玻璃纤维毡增强热塑性片材（GMT）的特点，分类及制造工艺；阐述了湿法即介质悬浮法制造热塑性片材的工艺流程及专用设备。     

GM T材料界面及性能研究

本文研究了GMT湿法成型工艺中PP接枝改性及偶联剂对材料界面及性能的影响，并通过SEM对材料拉伸断口形貌进行了分析。     

GMT流动成型纤维取向研究

GMT材料流动成型后玻纤在平面内发生取向，导致模压件呈各向异性，本研究从成型后制品上取样烧尽树脂，由扫描仪获取纤维数值图像，用Photoshop软件将图像反相，增强，再利用MATLAB软件确定纤维取向分布，研究表明，GMT单向流动成型时纤维沿流动方向取向，随流动距离增大，取向趋向更为明显，而均匀双向拉伸流动纤维取向程度较小，与片材相比，材料力学性能沿取向方向增大，但垂直取向方向材料性能变差。     

冻干水痘减毒活疫苗免疫持久性观察

目的观察国产冻干水痘减毒活疫苗的免疫原性和免疫持久性。方法选免疫前抗体阴性的健康易感儿童,随机分为3组,分别接种原倍疫苗、稀释疫苗及对照疫苗,并于接种后每年采集静脉血,用FAMA法测定抗体。结果原倍疫苗组和稀释疫苗组免疫后1~5年,平均抗体阳性率分别为91·05%、89·39%、95·56%、97·27%和98·76%。免疫后1年与5年抗体阳性率及抗体GMT比较,差异均无显著意义。原倍疫苗组和稀释疫苗组抗体阳性率及抗体GMT比较,差异亦无显著意义。接种原倍和稀释疫苗的两组与对照组比较,差异无显著意义。结论国产冻干水痘减毒活疫苗具有良好的免疫原性及免疫持久性。     

玻璃纤维毡增强热塑性复合材料(GMT)的压缩模塑

玻璃纤维毡增强的热塑性复合材料是目前国际上极为活跃的复合材料的开发品种之一,本文概括了聚丙烯基ＧＭＴ材料制品结构设计、压缩模型中需注意的问题,为ＰＰ－ＧＭＴ制品的设计和提供一定的指导。     

GM T 熔融浸渍中熔体在玻纤毡中的流动

通过改装毛细管流变仪建立了专门的实验装置, 研究高温高压下熔体在纤维床层中的流动行为。采用一维恒压流动实验分别测量了不饱和及饱和流动状况下玻纤毡厚度方向聚丙烯熔体的渗透率, 考察了玻纤毡空隙率、单丝直径、针刺等几何结构对渗透率的影响。根据实验结果进一步讨论了GM T 片材熔融浸渍过程中的气泡形成以及浸渍工艺参数的选择。      

Parametric study of automotive composite bumper beams subjected to low-velocity impacts

Fuel efficiency and emission gas regulations are the main causes for reducing the weight of passenger cars by using composite structures. Bumper beams are one of the main structures of passenger cars that protect them from front and rear collisions. In this paper, a commercial front bumper beam made of glass mat thermoplastic (GMT) is studied and characterized by impact modeling using LS-DYNA ANSYS 5.7 according to the E.C.E. UNITED NATIONS AGREEMENT [UNITED NATIONS AGREEMENT, Uniform Provisions concerning the Approval of Vehicles with regards to their Front and Rear Protective Devices (Bumpers, etc.), E.C.E., 1994]. Three main design factors for this structure: shape, material and impact conditions are studied and the results are compared with conventional metals like steel and aluminum. Finally the aforementioned factors are characterized by proposing a high strength SMC [Composite and metallic crash performance, Hawaii University, 1999, Available from: http://www.eng.hawaii.edu/˜nejhad/BUMPER/bumper.html] (sheet molding compound) bumper instead of the current GMT. The advantages of the proposed model: equal strength and rigidity of the structure, reduction of material, ease of manufacturing by simplifying geometrical shape and reduction of production cost are studied and proved.     

Collaborative simulation and scientific big data analysis: Illustration for sustainability in natural hazards management and chemical process engineering

Classical approaches for remote visualization and collaboration used in Computer-Aided Design and Engineering (CAD/E) applications are no longer appropriate due to the increasing amount of data generated, especially using standard networks. We introduce a lightweight and computing platform for scientific simulation, collaboration in engineering, 3D visualization and big data management. This ICT based platform provides scientists an “easy-to-integrate” generic tool, thus enabling worldwide collaboration and remote processing for any kind of data. The service-oriented architecture is based on the cloud computing paradigm and relies on standard internet technologies to be efficient on a large panel of networks and clients. In this paper, we discuss the need of innovations in (i) pre and post processing visualization services, (ii) 3D large scientific data set scalable compression and transmission methods, (iii) collaborative virtual environments, and (iv) collaboration in multi-domains of CAD/E. We propose our open platform for collaborative simulation and scientific big data analysis. This platform is now available as an open project with all core components licensed under LGPL V2.1. We provide two examples of usage of the platform in CAD/E for sustainability engineering from one academic application and one industrial case study. Firstly, we consider chemical process engineering showing the development of a domain specific service. With the rise of global warming issues and with growing importance granted to sustainable development, chemical process engineering has turned to think more and more environmentally. Indeed, the chemical engineer has now taken into account not only the engineering and economic criteria of the process, but also its environmental and social performances. Secondly, an example of natural hazards management illustrates the efficiency of our approach for remote collaboration that involves big data exchange and analysis between distant locations. Finally we underline the platform benefits and we open our platform through next activities in innovation techniques and inventive design.     

玻璃纤维毡增强聚丙烯材料（GMT）力学性能的研究

本文对影响玻纤毡增强聚丙的力学性能的各种因素进行了研究，探讨了炭黑种类及含量、改性ＰＰ的含量及对玻璃纤维毡结构等因素对ＧＭＴ材料的各项力学性能的影响，并得到炭黑的最佳种类、用量、改性ＰＰ的最和量及对玻璃纤维毡结构进行优化的途径。     

玻璃纤维毡增强聚丙烯在冲压成型中的纤维分布研究

本文研究了玻璃纤维毡增强聚丙烯(GMT)复合材料在流动态冲压成型中玻璃纤维的分布情况,分析了温度、压力等工艺参数对纤维分布的影响,为GMT片材冲压成型复杂形状的产品提供理论指导.