Advanced Composites Centre for Innovation and Science (ACCIS), Department of Aerospace Engineering, University of Bristol, Queen's Buildings, University Walk, Bristol BS8 1TR, UK.
J R Soc Interface. 2010 Aug 6;7(49):1229-41. doi: 10.1098/rsif.2009.0534. Epub 2010 Feb 11.
A study of the influence of embedded circular hollow vascules on structural performance of a fibre-reinforced polymer (FRP) composite laminate is presented. Incorporating such vascules will lead to multi-functional composites by bestowing functions such as self-healing and active thermal management. However, the presence of off-axis vascules leads to localized disruption to the fibre architecture, i.e. resin-rich pockets, which are regarded as internal defects and may cause stress concentrations within the structure. Engineering approaches for creating these simple vascule geometries in conventional FRP laminates are proposed and demonstrated. This study includes development of a manufacturing method for forming vascules, microscopic characterization of their effect on the laminate, finite element (FE) analysis of crack initiation and failure under load, and validation of the FE results via mechanical testing observed using high-speed photography. The failure behaviour predicted by FE modelling is in good agreement with experimental results. The reduction in compressive strength owing to the embedding of circular vascules ranges from 13 to 70 per cent, which correlates with vascule dimension.
研究了嵌入式圆形空心血管对纤维增强聚合物（FRP）复合材料层合板结构性能的影响。通过赋予自修复和主动热管理等功能，将此类血管纳入其中将导致多功能复合材料。然而，存在与纤维轴成角度的血管会导致纤维结构的局部破坏，即树脂富区，这被认为是内部缺陷，并可能在结构内引起应力集中。提出并演示了在传统 FRP 层压板中制造这些简单血管几何形状的工程方法。本研究包括形成血管的制造方法的开发、血管对层压板影响的微观表征、在负载下裂纹起始和失效的有限元（FE）分析，以及通过高速摄影观察的机械测试对 FE 结果的验证。FE 建模预测的失效行为与实验结果吻合良好。由于嵌入圆形血管，抗压强度降低了 13%至 70%，这与血管尺寸有关。
