Hussain Muzafar, Zaki Wael, Umer Rehan
Department of Aerospace Engineering, Khalifa University of Science and Technology, Abu Dhabi, UAE.
Department of Mechanical and Nuclear Engineering, Khalifa University of Science and Technology, Abu Dhabi, UAE.
Sci Rep. 2025 Apr 23;15(1):14093. doi: 10.1038/s41598-025-99123-4.
In this study, novel Fiber Metal Laminates (FMLs) were manufactured using Nickel Titanium (NiTi) sheets together with Carbon Fiber-Polyetherketoneketone (CF-PEKK) prepregs for different aerospace applications. We have investigated the effect of various temperatures on the flexural properties of NiTi/CF-PEKK FMLs. Prior to manufacture, NiTi sheets were anodized to improve the adhesion between the metal surface with the prepreg. The laminate was then compression molded in a hot-press. The flexural response of manufactured FMLs was investigated at various temperature conditions encompassing martensite and austenite phase of NiTi and glass transition temperature (T) of PEKK i.e. (50, 75, 100, and 175 °C). The fractographic studies were completed using optical microscopy and Scanning Electron Microscopy (SEM). The results showed that different testing temperatures have a significant impact on the flexural properties of the manufactured FMLs. Different types of failure modes were observed, ranging from brittle to ductile failure of fibers, delamination of NiTi sheets, and fiber pull-out from the matrix. The highest flexural strength (612 MPa) and flexural modulus (57.5 GPa) were observed at 100 ºC which was attributed to the higher modulus of NiTi in its austenitic phase and strong fiber-matrix interaction. However, above the glass transition temperature of PEKK, a sharp decline in the flexural response was observed due to the softness of the PEKK material and increased mobility within the prepreg layers.
在本研究中，采用镍钛（NiTi）片材与碳纤维-聚醚酮酮（CF-PEKK）预浸料制造了新型纤维金属层压板（FML），用于不同的航空航天应用。我们研究了不同温度对NiTi/CF-PEKK FML弯曲性能的影响。在制造之前，对NiTi片材进行阳极氧化处理，以提高金属表面与预浸料之间的附着力。然后在热压机中对层压板进行压缩成型。在包括NiTi的马氏体和奥氏体相以及PEKK的玻璃化转变温度（T）即（50、75、100和175℃）的各种温度条件下，研究了制造的FML的弯曲响应。使用光学显微镜和扫描电子显微镜（SEM）完成了断口分析研究。结果表明，不同的测试温度对制造的FML的弯曲性能有显著影响。观察到了不同类型的失效模式，从纤维的脆性到延性失效、NiTi片材的分层以及纤维从基体中拔出。在100℃时观察到最高弯曲强度（612MPa）和弯曲模量（57.5GPa），这归因于NiTi在其奥氏体相中的较高模量以及强的纤维-基体相互作用。然而，在PEKK的玻璃化转变温度以上，由于PEKK材料的柔软性以及预浸料层内流动性的增加，观察到弯曲响应急剧下降。
