Malik Shoaib A, Wang Liwei, Curtis Paul T, Fernando Gerard F
School of Metallurgy and Materials, University of Birmingham, Birmingham B15 2TT, UK.
Physical Sciences Department, Dstl Porton Down, Salisbury, Wilts SP4 0JQ, UK.
Sensors (Basel). 2016 Apr 28;16(5):615. doi: 10.3390/s16050615.
The primary load-bearing component in a composite material is the reinforcing fibres. This paper reports on a technique to study the fracture of individual reinforcing fibres or filaments in real-time. Custom-made small-diameter optical fibres with a diameter of 12 (±2) micrometres were used to detect the fracture of individual filaments during tensile loading of unreinforced bundles and composites. The unimpregnated bundles were end-tabbed and tensile tested to failure. A simple technique based on resin-infusion was developed to manufacture composites with a negligible void content. In both cases, optical fibre connectors were attached to the ends of the small-diameter optical fibre bundles to enable light to be coupled into the bundle via one end whilst the opposite end was photographed using a high-speed camera. The feasibility of detecting the fracture of each of the filaments in the bundle and composite was demonstrated. The in-situ damage detection technique was also applied to E-glass bundles and composites; this will be reported in a subsequent publication.
复合材料中的主要承重部件是增强纤维。本文报道了一种实时研究单个增强纤维或长丝断裂的技术。使用定制的直径为12（±2）微米的小直径光纤来检测未增强束和复合材料在拉伸加载过程中单个长丝的断裂情况。未浸渍的束进行了端部加固并拉伸至破坏。开发了一种基于树脂灌注的简单技术来制造孔隙率可忽略不计的复合材料。在这两种情况下，光纤连接器都连接到小直径光纤束的两端，以便光能够通过一端耦合到束中，同时使用高速相机拍摄另一端。证明了检测束和复合材料中每根长丝断裂的可行性。原位损伤检测技术也应用于E玻璃束和复合材料；这将在后续出版物中报道。
