Delamination is one of the most common defects in FRP and occurs due to low interlaminar strength. Such defects are difficult to detect and lead often to catastrophic failure of the composite. In this work a new approach of a multi-functional FML for structural applications is investigated. The interlaminar fracture toughness is determined and the capacitance change between the metal plies during crack propagation is measured in-situ. The metal sheet component undergoes a chemical pre-treatment by nanoscale sculpturing before manufacturing by resin transfer moulding, to prevent adhesive failure of the interfacial metal/matrix bond.

The experimental test results show high potential for detecting defects in FMLs. Delamination, which occurs between the glass fibre/matrix interface, can be electrically detected using the capacitance measurement. The fracture surface of the pre-treated metal sheet demonstrates that the adhesive bond between the cubical hook-like surface structure of the aluminium and the matrix remains intact.

分层是FRP中最常见的缺陷之一，并且由于层间强度低而发生。此类缺陷难以检测，并经常导致复合材料的灾难性故障。在这项工作中，研究了一种用于结构应用的多功能FML的新方法。确定层间断裂韧性，并现场测量裂纹扩展过程中金属层之间的电容变化。该金属片部件在通过树脂传递模塑制造之前通过纳米级雕刻进行化学预处理，以防止界面金属/基体结合的粘合失败。

实验测试结果显示出检测FML缺陷的巨大潜力。可以使用电容测量来电检测发生在玻璃纤维/基体界面之间的分层。预处理的金属板的断裂表面表明，铝的立方钩状表面结构与基体之间的粘接保持完整。