Production planning optimisation for composite aerospace manufacturing

Composite materials proved highly successful for aerospace applications in the last decades, but increased cost pressure forces the composite industry to become more efficient. This requires new manufacturing technologies and optimised processes as raw material costs and labour costs are basically fixed when wanting to keep production on site. Probably the most defining process for aerospace composite production is manual layup of prepreg material with subsequent curing in an autoclave. From production planning view, this combination poses the challenge of transition from discrete layup manufacturing to batch curing processing with the restriction of limited allowed storage time of the prepreg material prior to cure. In this paper, a new approach for production order optimisation at the conjunction of discrete and batch processing is presented. The APOLLO named tool is designed to decrease throughput times, streamline production and increase autoclave utilisation in the composite aerospace industry.     

不流动半固化片的研制及应用研究

通过对高性能环氧树脂进行降低流动性等特殊改性研究，开发出一种综合性能优良的不流动半固化片（No-Fl0w Prepreg），并成功通过了刚挠结合印制板厂家的试用及一系列严格考察评估。该产品从2007年下半年开始向市场推广，经多个厂家的批量生产使用，结果显示No-Flow Prepreg产品综合性能优良，使用质量稳定，达到国外同类产品的水平。     

高尔夫球杆用碳纤维预浸布品质研究

本文研究了碳纤维预浸布的规格及品质     

多层板翘曲的分析

主要针对多层板在设计生产中容易出现板翘曲的因素加以分析与分类,同时提出了一些常见的解决方法。     

Preparation and characterization of Nextel 720/alumina ceramic matrix composites via an improved prepreg process

In this work, the Nextel 720 continuous fiber reinforced alumina ceramic matrix composites (CMCs) were prepared by an improved prepreg process. The alumina matrix was derived from aqueous slurry, which consisted of organic glue, alumina sol, nanometer alumina powders, and micrometer alumina powders. This design provided a densely packed matrix for the CMC, and made the whole process relatively simple. The ratio of different alumina components in aqueous slurry was optimized to obtain good sintering activity, high thermal resistance, and excellent mechanical properties simultaneously. Furthermore, a preceramic polymer of mullite was used to strengthen the ceramic matrix through a multiple infiltration process. The final CMC sample achieved a high flexural strength of 255 MPa and a good high-temperature stability. After 24 h of heat treatment at 1100°C, 85% of the maximum flexural strength still had been retained.     

日本半固化片浸渍加工技术的新进展（1）——对近两年日本专利中半固化片浸渍加工技术创新例的综述

以2009年~2010年发表的半固化片浸渍加工技术与设备的日本专利为研究对象,对此创新内容及思路作以综述。     

复杂外形双频段天线罩的研制

选用改性环氧/芳纶布预浸料为原材料,采用薄壁结构,运用多次预成型的热压罐阳模成型技术,成功研制了复杂外形双频段天线罩。测试结果表明:天线罩最大测向误差为0.50°,最小功率透过95%。装机试飞表明满足飞行要求。     

T700／3234层合板力学性能的研究

研究了T700／3234层合板力学性能,T700／3234层合板铺层45°／-45°／0°／90°／0°／0°／90°／0°／-45°／45°.T700／3234中温固化环氧碳纤维单向预浸料适应于热压罐成型工艺方法.测试了23℃、60℃、80℃、100％下,T700／3234层合板拉伸性能、压缩性能、弯曲性能、层间剪切强度及层合板的拉伸剪切强度,得出不同温度下层合板各项力学性能的保持率,表明：T700／3234复合材料使用温度不大于80℃.     

风机叶片用单向碳纤维预浸料性能研究

为了提高风机功率,叶片的长度不断增加,因此碳纤维在风机叶片中的应用成为了必然趋势。本文研究了三种单向碳纤维预浸料的拉伸、弯曲、压缩以及纵横剪切性能,通过性能测试和断口微观观察分析发现,三种碳纤维/环氧树脂预浸料的纤维和树脂在性能上存在一定的差异,为合理选用风机叶片材料提供了一定的实验基础。     

U-3160单向碳纤维织物预浸前的整理改进

针对U-3160单向碳纤维织物组织结构松弛,存在布面不平整和纤维弯曲现象,在预浸前对其进行了必要的整理改进,从而有效减少了其预浸料中碳纤维的弯曲现象。结果表明,其复合材料的主要力学性能比未改进前有明显提高：纵向抗拉伸强度1599MPa,比改进前提高了15％;纵向抗拉伸模量133GPa,比改进前提高了9％;纵向抗压缩强度1153MPa,比改进前提高了21％;纵向抗压缩模量111GPa,比改进前提高了1．8％。达到了同类进口材料的实际水平。