Design of force introduction onserts for thin-walled fibre-polymer-composites

薄壁纤维聚合物复合材料的力引入装置设计

• 批准号: 275176947
• 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: 2015
• 资助国家: 德国
• 起止时间: 2014-12-31 至 2020-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/275176947?language=en
• 关键词: Design; force; introduction; onserts; thin

Load introduction in fiber-polymer-composites still remains a big challenge for composite designers. Mostly lightweight optimized structures are highly loaded; an additional problem is that composites always are applicated to thin structures, predominantly two-dimensional structures, such as sheets and shells. Load applications, in particular in the third dimension, often pose a special problem, since in this direction only the much weaker transverse tensile strength of the laminate is available. Since the strength in this direction is less than the longitudinal properties used in FRP, force introduction points have to be considered much more deeply.At the institute of Konstruktiver Leichtbau und Bauweisen a wide range of force introduction methods have been developed and tested. This includes the problem of the point loading on thin laminates. However, previous studies were limited mainly to metallic studs that were integrally embedded in the laminate. The design method worked out can directly be used by design engineers.However the material combination of FRP - metal represents an unfavorable material combination. Therefore, within the framework of this research project the application of force introduction shall be implemented in a FRP design.From that three main research tasks arise: the connection of the force introduction element to the basic structure, the integration of a thread and the optimal integration of a function like a universal joint.The overall objective is to give to the composite engineers design recommendations and the necessary reliable data in order to reach a lightweight optimum with maximum transmittable forces.

对于复合材料设计师来说，纤维聚合物复合材料中的载荷引入仍然是一个巨大的挑战。大多数轻质优化结构都具有高负载；另一个问题是复合材料总是应用于薄结构，主要是二维结构，例如片材和壳体。负载应用，特别是在三维空间中，通常会带来特殊问题，因为在这个方向上，层压材料的横向拉伸强度要弱得多。由于该方向的强度小于 FRP 中使用的纵向性能，因此必须更深入地考虑力引入点。Konstruktiver Leichtbau und Bauweisen 研究所开发并测试了多种力引入方法。这包括薄层压板上的点载荷问题。然而，之前的研究主要局限于整体嵌入层压板中的金属螺柱。制定出的设计方法可以直接供设计工程师使用。然而FRP-金属的材料组合代表了一种不利的材料组合。因此，在本研究项目的框架内，力引入的应用应在FRP设计中实现。由此产生了三个主要研究任务：力引入元件与基本结构的连接、螺纹的集成和优化集成万向节等功能。总体目标是为复合材料工程师提供设计建议和必要的可靠数据，以达到具有最大可传递力的轻量化最佳效果。