Impact resistant hierarchically structured materials based on fruit walls and nut shells

基于果壁和坚果壳的抗冲击分层结构材料

• 批准号: 128634082
• 负责人: Professor Dr.-Ing. Andreas Bührig-Polaczek
• 金额: --
• 依托单位: Fachgebiet Werkstofftechnik
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2009
• 资助国家: 德国
• 起止时间: 2008-12-31 至 2015-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/128634082?language=en
• 关键词: Impact; resistant; hierarchically; structured; materials

Fruit walls as well as nut and seed shells typically perform a multitude of functions. One of these consists in the direct or indirect protection of the seeds from mechanical damage or other negative environmental influences This qualifies such biological structures as role models for the development of new materials and components that protect commodities and/or persons from damage caused for example by rough handling or crashes. Our goal is to improve the mechanical properties of metal foam based components by altering their structure on various hierarchical levels inspired by features and principles important for the impact and/or puncture resistance of our role models, rather than by tuning the properties of the bulk material. For this we have established various investigation methods which combine mechanical testing with different imaging methods. We identified different structural hierarchies to be especially important for the mechanical deformation and failure behaviour of the biological role models. We abstracted and transferred these into corresponding structural principles and thus designed hierarchically structured bio-inspired metal foams. After the successful production of first metal based bio-inspired structures by investment casting during the 1st project period, the process has been modified and optimised within the last two years in order to realise more complex and more reliable structures, by implementing and combining different hierarchical structural elements as well as by minimising casting defects. To evaluate the structural effects, we applied similar investigation methods and mechanical testing experiments as those used for the biological role models. In the applied for project phase 3 we will further pursue this goal by gaining an even deeper quantitative understanding of the form-structure-function relationship of the biological concept generators on deeper hierarchical levels and level overarching, and by abstracting these findings and transferring them in bio-inspired metal foams and composite foam-based structures with further improved damping properties and puncture resistance.

果壁以及坚果和种子壳通常执行多种功能。其中之一是直接或间接地保护种子免受机械损伤或其他负面环境影响，这使得这种生物结构有资格作为开发新材料和组件的作用模型，以保护商品和/或人员免受例如粗暴处理或碰撞造成的损害。我们的目标是通过改变其结构上的各种层次的启发，我们的角色模型的冲击和/或耐穿刺性的重要特征和原则，而不是通过调整散装材料的性能，以提高金属泡沫为基础的组件的机械性能。为此，我们建立了各种调查方法，联合收割机机械测试与不同的成像方法相结合。我们确定了不同的结构层次是特别重要的机械变形和故障行为的生物学角色模型。我们将其抽象并转化为相应的结构原理，从而设计出具有层次结构的仿生金属泡沫。在第一个项目期间通过熔模铸造成功生产了第一个金属基仿生结构之后，在过去的两年里，该工艺进行了修改和优化，以实现更复杂，更可靠的结构，通过实施和组合不同的层次结构元素以及最大限度地减少铸造缺陷。为了评估结构的影响，我们采用了类似的调查方法和力学测试实验，用于生物角色模型。在申请的项目阶段3中，我们将进一步追求这一目标，通过在更深层次和更高层次上获得对生物概念发生器的形式-结构-功能关系的更深入的定量理解，并通过提取这些发现并将其转移到生物启发的金属泡沫和复合泡沫基结构中，进一步提高阻尼性能和抗穿刺性。