铝合金/碳纤维/聚醚醚酮混和十字迭奈米复材积层板之研制与高温下机械行为

Fabrication and Mechanical Behavior of Al/APC-2 Hybrid Cross-Ply Nanocomposite Laminates at Elevated Temperature

创新的超性能Al/APC-2混和十字迭奈米复材积层板已成功研制。众所皆知的脱层问题已由铝板的电镀表面处取代传统的铬酸化学蚀刻法大致排除。添加最佳化的二氧化硅奈米颗粒在APC-2十字迭迭层中甚至在高温下都可增强其机械性能。由所得的混和奈米复材积层板之数据,如拉伸强度与纵向劲度等机械性能可以看出其机械性能较化学蚀刻法强6%至10%。至于高温下拉伸-拉伸固定应力振幅疲劳试验,其应力-振次(S-N)曲线会随着温度上升而下降。然而由相对应温度之极限强度所无因次化的应力-振次曲线混在一起,而它们在高于105振次后会分开。这充分证明了拥有超强性能的混合奈米复材积层板已完成。并且高温下之拉伸与疲劳试验下皆无脱层,明显的展现了优良的混和积层板已制作完成。

The innovatively high performance AL/APC-2 hybrid cross-ply nanocomposite laminates were successfully fabricated. The well-known problem of delamination was mostly eliminated by the surface treatment of electroplating of Al 2024 sheets, instead of conventionally chemical etching by CrO3 etchants. Additions of optimal nanoparticles of SiO2 into APC-2 cross-ply laminates were used to improve the mechanical properties of hybrid laminates even at elevated temperature. From the received data, the mechanical proper ties, such as ultimate tensile strength and longitudinal stiffness, of hybrid nanocomposite laminates by electroplating are better than those by chemical etching about 6% to 10%. As for the tension-tension (T-T) constant stress amplitude cyclic tests at elevated temperature, the applies stress vs. cycles (S-N) curves go downwards as the temperature rising. However, the normalized S-N curves, by the corresponding ultimate strength at specific temperature, become mixed together. They are separate at least over 105 cycles. That evidently demonstrate the superior properties of the hybrid nanocomposite laminates have been achieved. Also, no delaminations were found in tensile and cyclic tests at elevated temperature. That significantly shows a nearly perfect bonding in hybrid laminates is made.