Research on methods to reduce the scattering and to increase the fatigue life of unidirectional fibre-polymer-composites

减少散射并提高单向纤维聚合物复合材料疲劳寿命的方法研究

• 批准号: 225954191
• 负责人: Professor Dr.-Ing. Helmut Schürmann
• 金额: --
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2012
• 资助国家: 德国
• 起止时间: 2011-12-31 至 2012-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/225954191?language=en
• 关键词: Research; methods; reduce; scattering; increase

A main focus of composite research concentrates on the failure behaviour of this material group. Especially structures which are fatigue loaded for long term are of great interest, e.g. leaf springs for trucks. Glass fibres succeeded in the recent years as the most suitable material for leaf springs. The big advantage of glass fibres for this case is their low Young's modulus, by which the requirement of high bending deformation can be fulfilled the most easiest. Leaf springs for the Daimler Sprinter are manufactured in large series since 2006. It must be the aim, to introduce the GRP-leaf springs especially for heavy trucks. By substituting steel springs a weight saving of about 75% of the spring mass is achievable, that means a weight reduction of 130 kg at the rear axle of the truck. This mass saving can be used for increasing the pay load and to lower the CO2 emission. In future an increase of the market share of the GRP leaf spring can be expected, that means a stronger competition to steel.To keep competetive with the GRP leaf spring it is absolutely necessary to scoop out all the potential of the material. To reach this goal a lot of fundamentals have to be worked out; this concerns- the non economic safety factors, which are used at this time for the design of these components- the calculation of the fatigue life- all chances to increase the life time.The sketched aim can be reached by lowering the scattering of strength of the leaf spring laminates and by testing new concepts to increase fatigue life.

复合材料研究的一个主要焦点集中在这种材料组的破坏行为上。特别是长期疲劳载荷的结构，例如卡车的钢板弹簧，引起了人们的极大兴趣。近年来，玻璃纤维成功地成为最适合制作钢板弹簧的材料。在这种情况下，玻璃纤维的最大优势是其低杨氏模量，通过它可以最容易地满足高弯曲变形的要求。自2006年以来，戴姆勒Sprinter的钢板弹簧开始大规模生产。引进grp钢板弹簧，特别是重型卡车的钢板弹簧，一定是我们的目标。通过替换钢弹簧，可以实现约75%的弹簧重量减轻，这意味着卡车后轴的重量减轻了130公斤。这种质量节约可以用于增加有效载荷和降低二氧化碳排放。在未来，GRP钢板弹簧的市场份额有望增加，这意味着对钢材的竞争将更加激烈。为了保持与GRP钢板弹簧的竞争力，挖掘材料的所有潜力是绝对必要的。要实现这一目标，必须解决许多基本问题；这涉及到非经济安全因素，这些因素在这个时候用于这些部件的设计，疲劳寿命的计算，都有机会增加寿命。通过降低板簧层合板的强度散射和试验提高疲劳寿命的新概念，可以达到初步的目标。