Prestressed, hybrid stringer sheet structures

预应力混合纵梁板结构

• 批准号: 275326014
• 负责人: Professor Dr.-Ing. Peter Groche
• 金额: --
• 依托单位: Institut für Produktionstechnik und Umformmaschinen
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2015
• 资助国家: 德国
• 起止时间: 2014-12-31 至 2018-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/275326014?language=en
• 关键词: Prestressed; hybrid; stringer; sheet; structures

This research proposal aims for stiffness-optimized manufacturing of plane and tubular structures. Within this project the stiffness of stringer sheets is further increased by applying an additional stressing of the stringer sheet during hydroforming. Therefore, stringer sheets are combined with fiber reinforced materials. Due to their different Young's moduli, the desired state of prestress is induced.So far, there are no processing strategies available, which consider the individual formability and the joint formation of both kinds of material. Furthermore, the formability limits of the combined forming process, the failure modes and the effective achievable grad of prestressing are unknown. These gaps will be filled by the proposed project.It aims for the technological basics for hybrid stringer sheets, which are prestressed during forming. This kind of preload anticipates later load scenarios. Due to their potential for structural lightweight optimization, prestressed stringer sheets are predestined for later applications in the transport- and automobile sector, in aviation industries and in architectural structures. The proposal is guided by the hypothesis, that the specific design of the metal-fiber joint enables the generation of the desired state of stress and solves incompatibilities with regard to the plastic and thermal material behavior.The proposal's objectives include constructive design approaches for mechanical and adhesive joints and the link between the stringers and the prestressing-elements. Furthermore, processing strategies considering the joint formation and the combined forming of the different materials will be developed. Therefore, the limits of the compounds' formability are investigated numerically and experimentally. Furthermore, tools enabling a temperature controlled forming will be designed. Further parts of the objective is the development of methods for the determination of control curves for characteristic temperatures, pressures and holding forces leading to a sound hybrid structure combined with the desired state of stress.A further objective is the determination and pretreatment of promising material combinations. The development and validation of the numerical calculation methods for a realistic modelling of the joint parts and the joint itself during the phases of forming and utilization are also important objectives of this proposal. Finally, the formed structures and the developed methods will be evaluated with regard to the overall aim, increased performance at slightly increased weight.

这项研究建议旨在使平面和管状结构的僵化制造。在该项目中，通过在水上成型过程中施加纵梁板的额外应力，进一步提高了纵梁的刚度。因此，将纵梁与纤维增强材料结合在一起。由于他们不同的年轻人的模量，诱发了所需的预应力状态。此外，组合形成过程的可高效限制，失败模式和有效的预应力级是未知的。这些差距将由拟议的项目填补。它的目的是用于混合纵梁表的技术基础知识，这些基础是在成型过程中预先贴心的。这种预紧力预计后来的负载方案。由于其潜在的结构轻量级优化，预应力的纵梁表被预定在以后在运输和汽车行业，航空工业和建筑结构中的应用。该提案的指导下是由假设指导的，即金属纤维关节的特定设计使所需的压力状态生成有关塑料和热材料行为的不兼容性。该提案的目标包括机械和机械性设计方法和粘合接头以及纵梁与预应力元件之间的联系。此外，将制定考虑联合形成和不同材料的合并形成的处理策略。因此，在数值和实验中研究了化合物的表现性极限。此外，还将设计启用温度控制形成的工具。目标的进一步部分是开发用于确定特征温度，压力和持有力的控制曲线的方法，导致合理的杂种结构结合了所需的压力状态。进一步的目标是确定和预处理有希望的材料组合。在形成和利用的阶段，对关节部分和关节本身进行现实建模的数值计算方法的开发和验证也是该建议的重要目标。最后，将评估形成的结构和开发方法的整体目标，以略有增加的重量提高性能。