WrapToR hierarchical space frames made from natural material composites

由天然材料复合材料制成的 WrapToR 分层空间框架

• 批准号: 2738821
• 金额: --
• 依托单位: University of Bristol
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2022
• 资助国家: 英国
• 起止时间: 2022 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2738821
• 关键词: WrapToR; hierarchical; space; frames; made

Trusses and space frames are some of the most efficient structural configurations developed to date. They achieve very high levels of performance through taking advantage of highly non-linear structural scaling laws by putting small amounts of material into localised members which are spaced far away from each other, allowing them to balance large forces and bending moments with minimal stress. Such structures are typically made from metals, which provide very good performance, but require large amounts of energy and resources to extract, smelt, and form. If such structures could instead be made from natural materials then their environmental impact could be significantly lowered and they could be adopted to a much wider range of applications. However, natural materials tend to have lower mechanical performance than metallic or traditional composite solutions. One potential way of mitigating the lower mechanical properties is to further exploit geometry by creating truss structures made from members which are themselves trusses. These Hierarchical Space Frames have been shown to be very promising in previous initial work with carbon fibre composite materials, and applying them to natural materials is made tenable through adoption of a patented truss beam manufacturing method being developed at Bristol, the Wrapped Tow Reinforced (WrapToR) truss manufacturing approach.WrapToR trusses are made by using a simple adaptation of filament winding that wraps pre-made longitudinal members in a wetted composite tow to produce a rigid web of shear members when cured. These truss beams can then be made into Hierarchical Space Frames by assembling them with joint structures. This, alongside the innate hierarchical makeup of natural materials, would create a synergistic order of hierarchy from the global structure down to the material level. WrapToR trusses and spaceframes made from natural materials are currently a promising but unexplored area of research, and practical, cost effective methods for joining WrapToR beams need to be developed. This work aims to develop the WrapToR method to devise a sustainable and low cost process for producing trusses and spaceframes from natural materials. To fulfil this aim the following objectives are set:- Develop the WrapToR method to maximise structural performance of natural material truss structures, aiming to account for and exploit the unique features of natural materials. - Experimental testing of natural material WrapToR trusses to characterise unique behaviour that is produced as a result of natural materials being used, that may differ from previously tested WrapToR trusses. Determining key relationships between structural performance, structural failure, material properties and truss geometry. Then using computational modelling and optimisation to design both individual trusses and Hierarchical Space Frames.- Investigate relevant, existing contemporary and traditional methods for joining trusses and beams in order to develop a practical and cost-effective process for joining individual WrapToR trusses into hierarchical space frames.These objectives will culminate with the manufacture of a full-scale natural material WrapToR Hierarchical Space Frame demonstrator for a relevant, real world application that can be tested under realistic loading conditions.

桁架和空间框架是迄今为止开发的最有效的结构配置中的一些。它们通过利用高度非线性的结构比例定律实现了非常高的性能水平，将少量材料放入彼此间隔很远的局部构件中，使它们能够以最小的应力平衡大的力和弯矩。这种结构通常由金属制成，其提供非常好的性能，但需要大量的能量和资源来提取、熔炼和成形。如果这种结构可以由天然材料制成，那么它们对环境的影响可以显着降低，并且它们可以被采用到更广泛的应用中。然而，天然材料往往具有比金属或传统复合材料解决方案更低的机械性能。减轻较低的机械性能的一种潜在方式是通过创建由本身是桁架的构件制成的桁架结构来进一步利用几何形状。这些层次空间框架已被证明是非常有前途的，在以前的初步工作与碳纤维复合材料，并将它们应用到天然材料是可行的，通过采用专利桁架梁制造方法正在开发的布里斯托，缠绕牵引加强（WrapToR）桁架制造方法。WrapToR桁架是通过使用简单的纤维缠绕，将纵向构件制成湿润的复合纤维束，以在固化时产生刚性的抗剪构件腹板。这些桁架梁，然后可以成为层次空间框架，通过组装他们与联合结构。这一点，再加上自然材料固有的等级构成，将创造一个从全球结构到物质层面的协同层次秩序。由天然材料制成的WrapToR桁架和空间框架目前是一个有前途但尚未探索的研究领域，需要开发用于连接WrapToR梁的实用且具有成本效益的方法。这项工作的目的是开发WrapToR方法，设计一个可持续的和低成本的过程，从天然材料生产桁架和空间框架。为了实现这一目标，设定了以下目标：-开发WrapToR方法，以最大限度地提高天然材料桁架结构的结构性能，旨在说明和利用天然材料的独特功能。- 对天然材料WrapToR桁架进行实验测试，以验证由于使用天然材料而产生的独特性能，这些性能可能与之前测试的WrapToR桁架不同。确定结构性能、结构失效、材料特性和桁架几何形状之间的关键关系。然后使用计算建模和优化来设计单独的桁架和分层空间框架。研究相关的、现有的现代和传统的连接桁架和梁的方法，以开发一种实用的、具有成本效益的工艺，将单个WrapToR桁架连接成分层空间框架。这些目标最终将以制造一个全尺寸的天然材料WrapToR分层空间框架演示器而告终，该演示器可用于相关的、真实的世界应用，并可在真实的负载条件下进行测试。