Contribution to the introduction of torsional moments in highly stressed fiber composite drive shafts

有助于在高应力纤维复合材料驱动轴中引入扭矩

• 批准号: 267625657
• 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: 2014
• 资助国家: 德国
• 起止时间: 2013-12-31 至 2016-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/267625657?language=en
• 关键词: Contribution; introduction; torsional; moments; highly

Shafts are a perfect application for lightweight design using fiber-polymer-composites. The primary challenge is the design of the load introduction at the shaft ends. A number of solutions are known. The lengthwise press fit fulfills both requirements: it is best in weight and suitable for series production. At the institute Konstruktiver Leichtbau und Bauweisen theoretical and experimental investigations have been carried out. The stress distribution during the lengthwise press fit assembly and during torsional load of the shaft were analytically specified, the design parameters can directly be used by the design engineers. However, important details which are crucial for an appropriate layout are still missing. In addition, many approaches to optimize driveshafts have not been worked on.The most important unanswered questions will be addressed in this research project. The micro-toothing of the longitudinal press fit joint has a critical effect on the lightweight grade. Its optimization is the most urgent aim, primarily the most suitable tooth geometry and the number of teeth around the circumference have to be worked out. Monitoring the depth of penetration of the teeth into the laminate is to picture the extent of fiber damage and its influence on the strength of the shaft. If the hub is fitted from the outside onto the driveshaft, a pillar ring must be attached to the inner driveshaft radius. The fibers of this pillar ring will be stressed by longitudinal compression stresses. To avoid stability failure, reliable solutions have to be developed. High torque loads induce high press forces, due to the larger press fitting needed. It is essential that measures are taken to minimize the amount of force needed to join the lengthwise press fit. The superior goal is to develop design guidelines for composite design engineers, providing them with the necessary data to develop lightweight longitudinal joints able to transfer maximum torsional moments.

轴是纤维聚合物复合材料轻量化设计的完美应用。主要挑战是轴端负载引入的设计。许多解决方案是已知的。纵向压配合满足这两个要求：重量最佳且适合批量生产。 Konstruktiver Leichtbau und Bauweisen 研究所进行了理论和实验研究。分析指定了纵向压配合装配期间和轴扭转载荷期间的应力分布，设计工程师可以直接使用设计参数。然而，对于适当布局至关重要的重要细节仍然缺失。此外，许多优化传动轴的方法尚未得到研究。本研究项目将解决最重要的未解答问题。纵向压接接头的微齿对轻量化等级具有至关重要的影响。其优化是最紧迫的目标，首先要计算出最合适的齿几何形状和圆周上的齿数。监测齿进入层压板的深度可以了解纤维损坏的程度及其对轴强度的影响。如果轮毂从外部安装到驱动轴上，则必须将支柱环安装到内部驱动轴半径上。该柱环的纤维将受到纵向压缩应力的作用。为了避免稳定性失效，必须开发可靠的解决方案。由于需要较大的压装件，高扭矩负载会产生高压力。必须采取措施尽量减少连接纵向压配合所需的力。最高目标是为复合材料设计工程师制定设计指南，为他们提供必要的数据来开发能够传递最大扭矩的轻质纵向接头。