碳纤维复合材料在液压油缸中的应用

碳纤维复合材料凭借优异的性能为不同场合的应用产生了积极的效应,在液压油缸上也受到广泛的关注。本文简述国内外碳纤维复合材料轻量化油缸的设计和工艺性的研究进展,并用碳纤维复合材料替代液压油缸部分金属组件,制造了碳纤维增强环氧树脂复合材料轻量化油缸。结果表明:碳纤维复合材料在结构和性能上具有很强的可设计性,既可降低液压油缸的重量,又能充分发挥复合材料高强度、耐腐蚀和疲劳性能。     

碳纤维复合材料轨道车辆结构的设计分析

车体的轻量化是轨道交通车辆未来发展的方向之一,碳纤维复合材料是车体轻量化设计的优选材料。本文介绍了一种全碳纤维复合材料车体的轻量化设计,包括整车结构设计和连接设计。通过有限元方法对复合材料整车结构的强度、刚度以及模态进行了校核。进一步对碳纤维复合材料的力学性能进行了评价。并按照一体化成型和模块化的思维,采用真空辅助成型工艺在烘箱环境下制备复合材料车体试验段,验证了车体的结构设计和制造技术的可行性。研究结果表明:(1)碳纤维复合材料车体的设计应综合考虑材料特性、车体结构和承载方式,减少零部件数量和连接,实现车体的一体化成型;(2)碳纤维复合材料在车体制造上能够较大幅度减少车体质量。本文设计的碳纤维复合材料车体在满足车体强度、刚度和模态标准的前提下,全碳纤维复合材料车体相比传统铝合金车体减重42%。     

飞机结构复合材料设计值研究进展

碳纤维复合材料在飞机结构中的广泛应用已经成为当前轻量化设计的主要趋势。随着复合材料生产工艺及设计技术的发展,合理确定并逐步提高复合材料设计值,对保障复合材料结构完整性前提下提高经济性意义重大。综述对飞机结构复合材料设计值的内涵进行了阐释,围绕飞机结构复合材料设计值的影响因素及其确定方法,回顾了国内外学者的研究成果。同时,总结了国内外飞机结构复合材料设计值确定理念的发展现状,探讨了进一步提高飞机结构复合材料设计值的研究方向。     

碳纤维复合材料在轻量化的应用和前景

复合材料的轻量化研究是现代设计制造的一大主流。随着社会对节能减排要求的日益提高,轻量化材料在各领域的应用将会更为广泛,轻量化材料是未来材料发展的一大趋势。通过对碳纤维复合材料的性能及其在轻量化的应用和前景进行简要介绍,综述了国内外几种有代表性的碳纤维型号和主要的成型工艺,结合轻量化这一特点对碳纤维复合材料应用前景进行分析。     

碳纤维复合材料在室内轻量化设计中的应用

为设计出自重较轻、外观轻巧的轻量化家具,使用碳纤维复合材料是一种有效的实现途径,其不仅可以减少物理重量,还可以借助结构和造型设计来营造轻盈感。基于此,分析了碳纤维复合材料在室内家装设计中的可能性和应用原则,并结合应用案例介绍了轻量化家具中碳纤维复合材料的应用工艺与效果,可为新型室内轻量化家具的设计提供一定的思路和参考。     

基于碳纤维复合材料轻木夹芯结构的起重机副臂架设计

针对汽车起重机臂架轻量化设计需求,设计了一种碳纤维复合材料轻木夹芯结构的汽车起重机副臂架。碳纤维复合材料密度低,比强度和比模量高,力学性能优异。应用有限元软件ABAQUS对碳纤维复合材料轻木夹芯结构的汽车起重机副臂架进行了结构设计和仿真分析。研究结果表明:碳纤维复合材料轻木夹芯结构副臂架中碳纤维复合材料上、下面板厚度分别为10 mm和8 mm,上、下面板铺层分别为[0/±45/0_2]_(10)和[0/±45/0_2]_8,其强度相比于碳纤维复合材料副臂架的安全裕量更大,同时刚度也满足使用需求,此时复合材料副臂架质量为251.4 kg,质量减轻达到了40%,具有良好的轻量化效果。     

轻质碳纤维复合材料帆船桅杆的设计与制备

碳纤维复合材料与金属相比,具有重量轻、可设计性强等优点.本文目的是设计并制备轻质碳纤维复合材料桅杆.基于等刚度准则,对具有等壁厚、异型截面的中空碳纤维复合材料桅杆进行设计,并运用数值模拟技术对结构铺层进行优化.采用纤维铺放和缠绕工艺制备出长度为16m的大尺寸碳纤维复合材料帆船桅杆,与铝合金桅杆相比减重43.4%.在设计工况下,桅杆变形试验值与数值模拟结果相近.     

轻量化碳纤维夹芯结构复合材料在轨道交通领域研究进展

轨道交通已成为当下最便利的出行方式之一,舒适享受、环保节能已成为轨道交通领域未来发展的刚性需求。碳纤维夹芯结构复合材料是一种经过结构设计所制作出的轻质复合材料。其性能减震降噪强、耐腐蚀高、耐疲劳性强、力学强度高。主要通过对碳纤维夹芯结构复合材料的轻量化、综合性能以及应用现状的加工工艺、设计原则进行分析,为未来复合材料发展提供依据。     

碳纤维复合材料在轻量化家具设计中的应用

轻量化家具的设计是一种挑战，既需要从物理上减轻质量，也需要满足人们对轻巧外观的需求。将碳纤维复合材料应用于家具中是实现轻量化家具的一种有效途径，这不仅可以减轻家具质量，还可以借助结构和造型设计来营造轻盈感。首先阐述了碳纤维复合材料应用在家具设计中的可能性和选用原则，然后举例说明了如何利用这种材料来设计轻量化家具，以期为新型轻量化家具的设计提供一定的思路和参考。     

CIK ONI最先成功设计碳纤维复合材料结构

<正>工程师们利用碳纤维复合材料进行了无限的想象设计,为轻量化发展提供了众多解决方案。然而,各类复合材料的性能迄今仍不能与碳纤维复合材料的高承载性能相当。当负载优先沿纤维方向作用时,CFRP(碳纤维增强复合材料)发挥主要优势。CIKONI(德国斯图加特)复合材料公司首先通过组合和全自动化的制造方法设计了碳纤维复合材料的     

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.     

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.     

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。     

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.     

Inorganic/organic nanocomposite coatings: The next step in coating performance

Inorganic/organic hybrid materials have considerable promise and are beginning to become a major area of research for many coating usages, including abrasion and corrosion resistance. Our primary approach is to prepare the inorganic phase in situ within the film formation process of the organic phase. The inorganic phase is introduced via sol-gel chemistry into a thermosetting organic phase. By this method, the size, periodicity, spatial positioning, and density of the inorganic phase can be controlled. An important aspect of the inorganic/organic hybrid materials is the coupling agent. The initial task of the coupling agent is to provide uniform mixing of the oligomeric organic phase with the sol-gel precursors, which are otherwise immiscible. UV-curable inorganic/organic hybrid systems have the advantages of a rapid cure and the ability to be used on heat sensitive substrates such as molded plastics. Also, it is possible to have better control of the growth of the inorganic phase using UV curing. It is our ultimate goal to completely separate the curing of inorganic and organic phases to gain complete control over the morphology, and hence optimization of “all” the coating properties. Thus far, it has been found that concomitant UV curing of the inorganic and organic phases using titanium sol-gel precursors afforded nanocomposite coatings which completely block the substrate from UV light while maintaining a transparent to visible light. Also, it has been found that the morphology of the inorganic phase is highly dependent on the concentration and reactivity of the coupling agent. Presented at the 82nd Annual Meeting of the Federation of Societies for Coatings Technology, October 27–29, 2004, in Chicago, IL.     

Ethanol and (−)-α-Pinene: Attractant Kairomones for Some Large Wood-Boring Beetles in Southeastern USA

Ethanol and α-pinene were tested as attractants for large wood-boring pine beetles in Alabama, Florida, Georgia, North Carolina, and South Carolina in 2002–2004. Multiple-funnel traps baited with (−)-α-pinene (released at about 2 g/d at 25–28°C) were attractive to the following Cerambycidae: Acanthocinus nodosus, A. obsoletus, Arhopalus rusticus nubilus, Asemum striatum, Monochamus titillator, Prionus pocularis, Xylotrechus integer, and X. sagittatus sagittatus. Buprestis lineata (Buprestidae), Alaus myops (Elateridae), and Hylobius pales and Pachylobius picivorus (Curculionidae) were also attracted to traps baited with (−)-α-pinene. In many locations, ethanol synergized attraction of the cerambycids Acanthocinus nodosus, A. obsoletus, Arhopalus r. nubilus, Monochamus titillator, and Xylotrechus s. sagittatus (but not Asemum striatum, Prionus pocularis, or Xylotrechus integer) to traps baited with (−)-α-pinene. Similarly, attraction of Alaus myops, Hylobius pales, and Pachylobius picivorus (but not Buprestis lineata) to traps baited with (−)-α-pinene was synergized by ethanol. These results provide support for the use of traps baited with ethanol and (−)-α-pinene to detect and monitor common large wood-boring beetles from the southeastern region of the USA at ports-of-entry in other countries, as well as forested areas in the USA.