多尺度联合仿真在汽车注塑零件减量化设计中的应用研究

为提高复合材料注塑件的仿真准确性,基于多尺度联合仿真方法,以汽车发动机正时链条导轨为例,根据导轨纤维配向以及结构应力分布情况,设计了导轨减量化结构,在保证整体应力水平在安全范围内的同时,最大应力降低了12％,质量减轻了4％,实现了汽车发动机正时链条导轨的减量化设计.     

复合材料发射筒前盖的研究进展

随着导弹发射系统的不断发展,对导弹发射装置也提出了更多的要求,发射筒前盖作为导弹发射系统的重要组成部分,其结构形式和开盖方式也不断的推陈出新,为了满足现代作战的需要,对其又提出了一系列功能性的要求,使其向结构功能一体化复合材料方向不断发展。本文介绍了复合材料发射筒前盖的应用情况,综述复合材料发射筒前盖的设计要点,并指出目前复合材料发射筒前盖面临的问题和未来的发展趋势。     

树脂基复合材料连接技术研究现状及在桥梁工程中的应用和发展

为促进树脂基复合材料连接技术的发展及其在桥梁工程中的应用,本文从连接接头形式、接头制作工艺、接头传力特点和承栽力影响因素等多个方面归纳总结了树脂基复合材料连接技术的研究成果,分析了其在桥梁工程中的应用现状及特点,认为连接技术是制约树脂基复合材料结构在桥梁工程中应用的瓶颈问题之一.根据树脂基复合材料结构的特点,借鉴航空工业中广泛应用的复合材料耳片接头、多向承插接头及复合材料桁架结构整体成型工艺等研究成果,提出了解决桥梁工程中复合材料结构连接问题的技术方案.     

民用飞机复合材料垂尾积木式试验研究

A C20-107B建议复合材料结构的适航符合性验证采用积木式试验的方法,全面而合理的试验规划和矩阵设计就成为是否符合积木式试验要求的关键.结合民用飞机复合材料垂尾的结构特点和方案,对复合材料垂尾的积木式试验进行初步试验规划,并给出了试验矩阵设计的原则和思路,用于对复合材料的积木式试验提供指导和借鉴.     

巡航导弹树脂基结构复合材料的应用与发展

描述了树脂基结构复合材料在巡航导弹方面的应用和发展。综述了巡航导弹树脂基结构复合材料国外发展现状和国内发展趋势,重点介绍了针对国内巡航导弹弹体结构特点的3种复合材料新结构和技术,指出树脂基结构复合材料对未来巡航导弹技术发展具有极大的推动作用。     

航空航天先进复合材料研究现状及发展趋势

材料支撑了航空航天发展,而新时代建设航空航天强国的新使命对材料提出了新的需求.先进复合材料的高性能轻质化、耐极端环境、多功能智能化等特点极大了促进了航空航天技术更新.文章从复合材料发展现状入手,重点从结构类型及功能类型两方面分别介绍了复合材料研究的热点问题,最后展望了先进复合材料未来的发展趋势与方向.     

日本成功发射复合材料中间站

日本人造卫星发射装置H-11AF7成功发射一个大型复合材料中间站。中间站为圆筒形复合材料夹层结构，采用Degussa AG公司的高性能Rohacell聚甲基丙烯酰胺（PMI）发泡塑料作为：卷材。精细的热塑性发泡塑料PMI部分，用作芯材的预裁料坯。据DegussaAG公司称，由于是夹层结构，发泡塑料有助于防止该中间站弯曲。     

可快速安装的滑移式橡胶护舷

正本发明提供了一种可快速安装的滑移式橡胶护舷,涉及码头附属设施技术领域。可快速安装的滑移式橡胶护舷,包括导轨、底座和橡胶护舷,导轨根据需求沿不同方向布设在码头前沿线上,橡胶护舷固定安装在底座上;底座可滑动地嵌套在导轨上;底座上设置有弹性卡扣机构,底座通过弹性卡扣机构与导轨实现固定或脱离。     

清管器发射装置述评

叙述了清管器发射装置的工作原理,并将其分成四类:单球发射装置、多阀多球发射装置、垂直多球发射装置和自动多球发射装置.对每一类发射装置的工作过程进行了详细论述,对它们适用的场所和优缺点分别进行了详细阐述,介绍了清管器当前的研究与应用情况.     

信息动态

本文回顾了我国玻璃钢/复合材料标准化和检测技术发展历程,包括玻璃钢/复合材料早期的标准化工作、标准化工作的归口管理、标准制修订情况,以及玻璃钢/复合材料静态力学性能测试、无损检测、老化、碳纤维复合材料和夹层结构测试等.     

Insect antifeedant properties of anthranoids from the genusVismia

Vismiones and ferruginins, representatives of a new class of lypophilic anthranoids from the genusVismia were found to inhibit feeding in larvae of species ofSpodoptera, Heliothis, and inLocusta migratoria.     

Direct observation of freeze-thaw instability of latex coatings via high pressure freezing and cryogenic SEM

Despite its industrial importance, the subject of freeze-thaw (F/T) stability of latex coatings has not been studied extensively. There is also a lack of fundamental understanding about the process and the mechanisms through which a coating becomes destabilized. High pressure (2100 bar) freezing fixes the state of water-suspended particles of polymer binder and inorganic pigments without the growth of ice crystals during freezing that produce artifacts in direct imaging scanning electron microscopy (SEM) of fracture surfaces of frozen coatings. We show that by incorporating copolymerizable functional monomers, it is possible to achieve F/T stability in polymer latexes and in low-VOC paints, as judged by the microstructures revealed by the cryogenic SEM technique. Particle coalescence as well as pigment segregation in F/T unstable systems are visualized. In order to achieve F/T stability in paints, latex particles must not flocculate and should provide protection to inorganic pigment and extender particles. Because of the unique capabilities of the cryogenic SEM, we are able to separate the effects of freezing and thawing, and study the influence of the rate of freezing and thawing on F/T stability. Destabilization can be caused by either freezing or thawing. A slow freezing process is more detrimental to F/T stability than a fast freezing process; the latter actually preserves suspension stability during freezing. Presented at the 82nd Annual Meeting of the Federation of Societies for Coatings Technology, October 27–29, 2004 in Chicago, IL. Tied for first place in The John A. Gordon Best Paper Competition.     

Ethanol and (−)-α-Pinene: Attractant Kairomones for Bark and Ambrosia Beetles in the Southeastern US

In 2002–2004, we examined the flight responses of 49 species of native and exotic bark and ambrosia beetles (Coleoptera: Scolytidae and Platypodidae) to traps baited with ethanol and/or (−)-α-pinene in the southeastern US. Eight field trials were conducted in mature pine stands in Alabama, Florida, Georgia, North Carolina, and South Carolina. Funnel traps baited with ethanol lures (release rate, about 0.6 g/day at 25–28°C) were attractive to ten species of ambrosia beetles (Ambrosiodmus tachygraphus, Anisandrus sayi, Dryoxylon onoharaensum, Monarthrum mali, Xyleborinus saxesenii, Xyleborus affinis, Xyleborus ferrugineus, Xylosandrus compactus, Xylosandrus crassiusculus, and Xylosandrus germanus) and two species of bark beetles (Cryptocarenus heveae and Hypothenemus sp.). Traps baited with (−)-α-pinene lures (release rate, 2–6 g/day at 25–28°C) were attractive to five bark beetle species (Dendroctonus terebrans, Hylastes porculus, Hylastes salebrosus, Hylastes tenuis, and Ips grandicollis) and one platypodid ambrosia beetle species (Myoplatypus flavicornis). Ethanol enhanced responses of some species (Xyleborus pubescens, H. porculus, H. salebrosus, H. tenuis, and Pityophthorus cariniceps) to traps baited with (−)-α-pinene in some locations. (−)-α-Pinene interrupted the response of some ambrosia beetle species to traps baited with ethanol, but only the response of D. onoharaensum was interrupted consistently at most locations. Of 23 species of ambrosia beetles captured in our field trials, nine were exotic and accounted for 70–97% of total catches of ambrosia beetles. Our results provide support for the continued use of separate traps baited with ethanol alone and ethanol with (−)-α-pinene to detect and monitor common bark and ambrosia beetles from the southeastern region of the US.     

Methyl 2,4,6-decatrienoates Attract Stink Bugs and Tachinid Parasitoids

Halyomorpha halys (Stål) (Pentatomidae), called the brown marmorated stink bug (BMSB), is a newly invasive species in the eastern USA that is rapidly spreading from the original point of establishment in Allentown, PA. In its native range, the BMSB is reportedly attracted to methyl (E,E,Z)-2,4,6-decatrienoate, the male-produced pheromone of another pentatomid common in eastern Asia, Plautia stali Scott. In North America, Thyanta spp. are the only pentatomids known to produce methyl 2,4,6-decatrienoate [the (E,Z,Z)-isomer] as part of their pheromones. Methyl 2,4,6-decatrienoates were field-tested in Maryland to monitor the spread of the BMSB and to explore the possibility that Thyanta spp. are an alternate host for parasitic tachinid flies that use stink bug pheromones as host-finding kairomones. Here we report the first captures of adult and nymph BMSBs in traps baited with methyl (E,E,Z)-2,4,6-decatrienoate in central Maryland and present data verifying that the tachinid, Euclytia flava (Townsend), exploits methyl (E,Z,Z)-2,4,6-decatrienoate as a kairomone. We also report the unexpected finding that various isomers of methyl 2,4,6-decatrienoate attract Acrosternum hilare (Say), although this bug apparently does not produce methyl decatrienoates. Other stink bugs and tachinids native to North America were also attracted to methyl 2,4,6-decatrienoates. These data indicate there are Heteroptera in North America in addition to Thyanta spp. that probably use methyl 2,4,6-decatrienoates as pheromones. The evidence that some pentatomids exploit the pheromones of other true bugs as kairomones to find food or to congregate as a passive defense against tachinid parasitism is discussed.     

2007～2008年世界塑料工业进展

收集了2007年7月～2008年6月世界塑料工业的相关资料,介绍了2007～2008年国外塑料工业的发展情况,提供了世界塑料产量、消费量及全球各类树脂的需求量及产能情况.按通用热塑性树脂(聚乙烯、聚丙烯、聚苯乙烯、聚氯乙烯、ABS树脂)、工程塑料(尼龙、聚碳酸酯、聚甲醛、热塑性聚酯、聚苯醚)、特种工程塑料(聚苯·硫醚、液晶聚合物、聚醚醚酮)、通用热固性树脂(酚醛、聚氨酯、不饱和聚酯树脂、环氧树脂)不同品种的顺序,对树脂的产量、消费量、供需状况及合成工艺、产品应用开发、树脂品种的延伸及应用的进一步扩展等技术作了详细介绍.     

2005～2006年国外塑料工业进展

收集了2005年7月～2006年6月国外塑料工业的相关资料,介绍了2005—2006年国外塑料工业的发展情况。提供了世界塑料产量、消费量及全球各类树脂生产量以及各国塑料制品的进出口情况。作为对比,介绍了中国塑料的生产情况。按通用热塑性树脂（聚乙烯、聚丙烯、聚苯乙烯、聚氯乙烯、ABS树脂）、工程塑料（聚酰胺、聚碳酸酯、聚甲醛、热塑性聚酯、聚苯醚）、通用热固性树脂（酚醛、聚氨酯、不饱和树脂、环氧树脂）、特种工程塑料（聚苯硫醚、液晶聚合物、聚醚醚酮）的品种顺序,对树脂的产量、消费量、供需状况及合成工艺、产品开发、树脂品种的延伸及应用的扩展作了详细的介绍。