Abstract

This research work investigated the effects of SiO₂ and ZrO₂ nanoparticles type and content incorporated into an epoxy matrix on the high velocity impact behavior of carbon fiber reinforced aluminum laminates (CARALL). CARALL specimens consisted of a 0/90/90/0 stacking sequence of a carbon-epoxy composite containing 0, 1, 3, 5 and 7 wt% of each of nanoparticles sandwiched between two layers of aluminum 2024-T3. To observe the toughening effects of the nanoparticles on the fracture surface of the impacted CARALL, a typical field emission scanning electron microscope (FESEM) was employed. Impact energy absorption of CARALL was at most increased by 18 % and 12 % with the nanoparticles content of 5 wt% SiO₂ and 3 wt% ZrO₂, respectively. Overloading of the nanoparticles content up to 7 wt% resulted in the creation of nanoparticles aggregated sites associated with loss in the energy absorption capacity. FESEM fractography procedure also showed that the crack deflection and pinning were the most recognizable toughening mechanisms exhibited by nanoparticles. Overall, the controlled addition of SiO₂/ZrO₂ rigid nanoparticles to CARALL was found to be a promising method for improving the high velocity impact energy absorption of CARALL.

中文翻译：

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纳米二氧化硅和氧化锆增韧铝-碳纤维-环氧层压复合材料的高速冲击响应

摘要

这项研究工作研究了SiO ₂和ZrO ₂纳米颗粒的类型和掺入环氧基质中的含量对碳纤维增强铝层压板（CARALL）高速冲击性能的影响。CARALL样品由碳-环氧复合物的0/90/90/0堆叠顺序组成，该碳-环氧复合物包含夹在两层铝2024-T3之间的每种重量百分比为0、1、3、5和7的纳米颗粒。为了观察纳米颗粒在撞击的CARALL断裂表面上的增韧作用，采用了典型的场发射扫描电子显微镜（FESEM）。当纳米颗粒含量为5 wt％SiO ₂和3 wt％ZrO _2时，CARALL的冲击能量吸收最多增加18％和12％， 分别。纳米颗粒含量的超载高达7wt％导致与能量吸收能力的损失相关的纳米颗粒聚集位点的产生。FESEM断层扫描程序还显示，裂纹变形和钉扎是纳米颗粒最可识别的增韧机制。总体而言，发现将SiO ₂ / ZrO ₂刚性纳米颗粒控制加入CARALL是改善CARALL高速冲击能量吸收的一种有前途的方法。