Abstract This work consists of the synthesis of high purity graphene nanoflakes (GNF), the manufacturing of GNF-epoxy nanocomposites and the mechanical characterization of the nanocomposite at high and quasi static strain rates, (2750/s - 1.E−5/s). GNF were synthesized by using the electric arc discharge technique. Thermogravimetry/Differential Thermal Analysis (TG/DTA) of synthesized graphene reveals high purity and high crystallinity. Raman spectra and the broad Brunauer-Emmet-Teller (BET) specific surface area indicate that the synthesized graphene has several layers. Following the solution mixing manufacturing process of GNF-epoxy nanocomposites, the influences of strain rate on the mechanical behaviors are investigated under quasi static and dynamic loadings. High strain rate uniaxial compression tests (1270–2750/s) using Split Hopkinson Pressure Bar (SHPB) and quasi static compression tests (1.E−3 and 1.E−5/s) of GNF-epoxy with two graphene contents (0.1 and 0.5 wt %) are performed at room temperature. The maximum elasticity modulus achieved by the GNF-epoxy with 0.5 wt% at the strain rate of 2350/s corresponds to a 68% increase compared to the neat epoxy. The yield strength of the material is doubled under dynamic loading conditions compared to the quasi static loading.

中文翻译：

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石墨烯-环氧树脂纳米复合材料的高应变率行为

摘要 这项工作包括高纯度石墨烯纳米薄片 (GNF) 的合成、GNF-环氧树脂纳米复合材料的制造以及纳米复合材料在高和准静态应变速率 (2750/s - 1.E-5/s ）。GNF是通过使用电弧放电技术合成的。合成石墨烯的热重/差热分析 (TG/DTA) 显示出高纯度和高结晶度。拉曼光谱和广泛的布鲁诺-埃米特-特勒 (BET) 比表面积表明合成的石墨烯具有多层。遵循 GNF-环氧树脂纳米复合材料的溶液混合制造过程，研究了在准静态和动态载荷下应变速率对力学行为的影响。使用 Split Hopkinson Pressure Bar (SHPB) 的高应变率单轴压缩测试 (1270–2750/s) 和具有两种石墨烯含量的 GNF-环氧树脂的准静态压缩测试（1.E-3 和 1.E-5/s）（ 0.1 和 0.5 重量％) 在室温下进行。与纯环氧树脂相比，GNF-环氧树脂在 2350/s 应变速率下以 0.5 wt% 获得的最大弹性模量对应于 68% 的增加。与准静态加载相比，材料在动态加载条件下的屈服强度增加了一倍。