复合材料人行道支架设计及性能验证

设计了一种主要用于铁路桥梁人行道的复合材料人行道支架。相比原钢制人行道支架,该复合材料人行道支架可减重50%～85%。对复合材料人行道支架进行了有限元分析,仿真计算结果表明该复合材料人行道支架的强度和刚度均满足铁路桥梁人行道使用的技术要求,经过试验验证,该复合材料人行道支架产品的计算分析结果与试验结果基本吻合。研究结果证明了该复合材料人行道支架在实际使用中具有足够的安全性。     

碳纤维复合材料引擎盖的轻量化设计

以汽车碳纤维复合材料引擎盖为研究对象,采用碳纤维复合材料为研究材料,以层合板理论为力学数值模拟CAE设计基础,利用ABAQUS软件对单层级试样准静态拉伸试验和典型U形梁结构准静态三点弯试验进行仿真,然后进行了台架模态和抗凹刚度测试。采用概念设计、材料性能试验和工艺设计多阶段联合优化设计的方法,最终在满足各种力学性能和制造工艺要求的前提下,实现碳纤维复合材料引擎盖的轻量化设计。     

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。     

可旋转接头的设计和试验验证

聚四氟乙烯燃油总管是由多个三通或四通金属接头和钢丝增强聚四氟乙烯软管组成的柔性导管总成,绕发动机燃烧室环向安装,每个金属接头均布向发动机提供航空煤油。介绍一种具有旋转功能的接头,由其组装的燃油总管,在规定工作压力和工况条件下,既保证了接头的密封效果,又可根据现场安装要求旋转接头的角度以满足安装要求,不仅降低了燃油总管的质量成本且极大地提高了现场的装配效率。通过试验验证,由其组装的燃油总管的性能满足发动机的使用要求。     

复合材料粘接的新发展

选择合适的连接方法与选择合适的复合材料一样重要,均影响着复合材料产品的性能。胶接连接能有助于创新复合材料的设计,以充分发挥复合材料的潜力。Vantico AG的Jochem Sauer阐述了最新胶粘剂是如何提高轻质复合材料结构的新技术运用和如何降低其成本。复合材料具有比强度高、比模具高、耐腐蚀及可设计性强等优点,如金属等其他材料必须化更大的成本才能获得上述性能。因其具有上述及其它许多独特性能,复合材料在各个工业领域的运用正稳步上升,例如航空业、汽车业、体育器材、建筑业及化工业等,举不胜举。从复合材料部件组成产品的总体性能看,各部件间的连接方法与其自身复合材料的性能一样至关重要。     

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。     

轻量化复合材料桁架桥承载性能试验研究

轻量化复合材料桁架桥是以碳/玻混杂纤维增强复合材料(FRP)与铝合金为原材料的,为武警部队研发、通行重型荷载的应急桥装备。为了验证桥梁的承载性能,对30 m跨轻量化复合材料桁架桥进行了静载与动载试验。结果表明:轻量化后的应急桥在静动载作用下,结构处于线弹性状态,杆件应力与桥梁变形均小于设计允许值,桥梁性能良好,达到了工程应用的设计要求。     

轻量化高性能碳纤维复合材料车体研发关键技术

简述了轨道交通领域碳纤维复合材料应用现状,从结构材料设计、整体结构设计、车体成型技术、构件连接技术、结构声学设计、缺陷检测技术等多个方面探讨复合材料整车车体研发的技术难点。在碳纤维复合材料车体研发的过程中,只有充分理解和实现复合材料的材料、设计、制造一体化,全面综合地考虑各种关键技术,才能获得高性能的碳纤维复合材料车体,并有效降低复合材料车体的成本;只有建立完整的复合材料车体设计、制造、验证技术规范和质量评价体系,碳纤维复合材料才能在轨道交通行业中得到推广应用。     

复合材料结构轻量化方法及技术

本文分析和总结了采用纤维增强聚合物复合材料(FRP)实现结构轻量化的主要方法及技术。指出了实现结构轻量化的三个主要方法,一是复合材料的高性能化,即通过进一步提高复合材料的比强度和比模量实现结构减重;二是复合材料高效承载结构构型优化设计,即通过复合材料优势承载能力与结构传力路径的优化配置实现结构减重;三是复合材料复杂结构整体成型,即通过摒弃连接赘重实现结构减重。并给出了实现上述三种结构轻量化方法的技术途径。     

Design,manufacture, and test of lightweight composite sandwich helmets

Abstract

This paper summarises work undertaken on the design, manufacturing development, and impact testing of a lightweight composite aircrew helmet. Full details are given on the double diaphragm forming process, developed at DERA, which has been extensively used to manufacture the complex, doubly curved layers that form the final helmet assembly. Manufacturing options for the development of a ‘form fitting’ foam liner are also included, as are developments in the foam liner press moulding processes.

Results from an extensive impact test programme conducted on fully assembled shell samples are provided, illustrating good energy management during test. Some redundant material was apparent from the results, hence further mass reduction is possible. Modification of the layer deformation sequence is also required. However the sandwich shells met all impact test requirements. Correlation of the impact test data and helmet damage cross- sections has allowed recommendations to be made regarding improved design and manufacture of the layered construction. Predictions based on these improvements show the final helmet mass should be ～750 g, excluding breathing systems and communications.     

商用车车身结构粘接技术研究

通过对结构胶粘剂材料性能、工艺性能等研究,建立了框架结构车身与外覆盖件粘接技术,极大降低了框架结构商用车的开发成本,缩短了开发周期。     

CRH3高速动车组前风挡玻璃受力近似分析与粘接强度校核

通过对4种工况条件下高速动车组风挡玻璃的受力情况进行近似分析,使用工程应用中的经验公式对其粘接层设计尺寸进行了校核,验证弹性胶粘剂粘接高速动车组风挡玻璃的安全性。     

汽车用阻尼材料与车身粘接图像分析

将阻尼材料烘烤在玻璃板上，用扫描仪扫描出粘接图像，图像包含百万以上像素和256级灰度，在临界灰度级下，分离出粘接图像，在一定的剪切强度下，测定出阻尼材料与车身的有效粘接面积。     

Design implications of adhesive bonding in car body construction

The general principles of unitary construction car body design are reviewed and related to the requirements of conventional spot welding techniques by reference to three current high-volume production cars. The possible evolution of new designs for body assembly using adhesive bonding technology is considered through an analysis of sill and floor joint details. These developments are then discussed in the context of the production opportunities and constraints in the motor industry.     

Accelerated-curing epoxy structural film adhesive for bonding lightweight honeycomb sandwich structures

Accelerating the curing of epoxy/aromatic amine adhesives and improving their toughness are challenges in heat-resistant epoxy structural adhesives. Herein, we report an epoxy/aromatic amine adhesive accelerated curing system with an oxo-centered trinuclear (chromium III) complex, which is toughened using a thermoplastic block copolymer (TPBC). The reaction characteristics, heat resistance, microstructure, and bonding properties of the accelerated epoxy adhesives were analyzed. The reaction peak temperature of the epoxy with 3% catalyst was 113.1°C, which was 113.6°C lower than that of epoxy without catalyst, and the modified epoxy resin demonstrated a potential for rapid curing at medium temperature. The glass transition temperature of the TPBC-toughened epoxy adhesive was 125°C after curing, indicating excellent thermal stability after medium temperature curing. The introduction of the TPBC increased the single-lap shear strength of the epoxy adhesive without reducing its heat resistance. The shear strength at room temperature and 120°C of the modified epoxy adhesive with 50 phr of TPBC was 25.2 and 10.9 MPa, respectively. Moreover, the epoxy film adhesive exhibited outstanding bonding properties when used in the bonding of lightweight honeycomb sandwich structures.     

改进的车体防静电装置

介绍了一种油类物质装载车的防静电装置的结构及其操作方法.     

Investigations into lightweight solutions for epoxy composite fire property improvement

Abstract

The aim is to study methods to improve the fire properties of carbon fibre reinforced epoxy composites with interlayers without compromising structural performance, i.e. using a carbon fibre veil with expandable graphite, an intrinsically flame retardant thermoplastic film or a carbon fibre reinforced thermoplastic (CFTP) layer. The CFTP layer seems the most promising, with a significant improvement in fire properties as determined with cone calorimetry, while the mechanical performance of the modified composite appears unaffected.     

钢轨接头用结构胶粘剂的研制与应用

介绍了一种钢轨接头胶接用的结构胶粘剂的制备、性能以及应用情况。该胶可在温（１２０℃）,０．５h固化,具有优良的剪切强度和韧性以及良好的耐湿性、耐介质性能。该胶粘剂室温贮存期可达２a,适合铁路部门批量生产钢轨绝缘胶接接头。     

Metallic multi-material adhesive joint testing and modeling for vehicle lightweighting

While adhesive bonding has been shown to be a beneficial technique to join multi-material automotive bodies-in-white, quantitatively assessing the effect of adherend response on the ultimate strength of adhesively bonded joints is necessary for accurate joint design.In the current study, thin adherend single lap shear testing was carried out using three sheet metals used to replace mild steel when lightweighting automotive structures: hot stamped Usibor® 1500 AS ultra-high strength steel (UHSS), aluminum (AA5182), and magnesium (ZEK 100). Six combinations of single and multi-material samples were bonded with a one-part toughed structural epoxy adhesive and experimentally tested to measure the force, displacement across the bond line, and joint rotation during loading. Finite element models of each test were analyzed using LS-DYNA to quantitatively assess the effects of the mode mixity on ultimate joint failure. The adherends were modeled with shell elements and a cohesive zone model was implemented using bulk material properties for the adhesive to allow full three-dimensional analysis of the test, while still being computationally efficient.The UHSS-UHSS joint strength (27.2 MPa; SD 0.6 MPa) was significantly higher than all other material combinations, with joint strengths between 17.9 MPa (SD 0.9 MPa) and 23.9 MPa (SD 1.4 MPa). The models predicted the test response (average R2 of 0.86) including the bending deformation of the adherends, which led to mixed mode loading of the adhesive. The critical cohesive element in the UHSS-UHSS simulation predicted 85% Mode II loading at failure while the other material combinations predicted between 41% and 53% Mode II loading at failure, explaining the higher failure strength in the UHSS-UHSS joint.This study presents a computational method to predict adhesive joint response and failure in multi-material structures, and highlights the importance of the adherend bending stiffness and on joint rotation and ultimate joint strength.