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该材料组的破坏行为上。特别是长期承受疲劳载荷的结构，如载重汽车的钢板弹簧，更是备受关注。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，玻璃纤维的最大优点是其低的杨氏模数，最容易满足大弯曲变形的要求。戴姆勒短跑的钢板弹簧自2006年以来一直在大批量生产。目标一定是引进重型卡车专用的玻璃钢钢板弹簧。通过替代钢弹簧，可以实现弹簧质量的75%的重量减轻，这意味着卡车后桥的重量减轻了130公斤。这种质量节约可用于增加有效载荷和降低二氧化碳排放。在未来，玻璃钢钢板弹簧的市场份额有望增加，这意味着钢材的竞争将更加激烈。为了保持与玻璃钢钢板弹簧的竞争力，挖掘这种材料的所有潜力是绝对必要的。为了实现这一目标，必须解决许多基本问题；这涉及到--此时用于这些部件设计的非经济安全系数--疲劳寿命的计算--所有延长寿命的机会。可以通过降低钢板弹簧层板的强度离散度和测试提高疲劳寿命的新概念来达到初步的目标。