Laboratory of Bio-Inspired and Graphene Nanomechanics, Department of Civil, Environmental and Mechanical Engineering, University of Trento , via Mesiano 77, I-38123 Trento, Italy.
European Centre for Theoretical Studies in Nuclear Physics and Related Areas, Fondazione Bruno Kessler & Trento Institute for Fundamental Physics and Applications , strada delle Tabarelle 286, Villazzano, I-38123 Trento, Italy.
ACS Appl Mater Interfaces. 2017 Nov 22;9(46):40820-40830. doi: 10.1021/acsami.7b12030. Epub 2017 Nov 9.
We study the ballistic properties of two-dimensional (2D) materials upon the hypervelocity impacts of C fullerene molecules combining ab initio density functional tight binding and finite element simulations. The critical penetration energy of monolayer membranes is determined using graphene and the 2D allotrope of boron nitride as case studies. Furthermore, the energy absorption scaling laws with a variable number of layers and interlayer spacing are investigated, for homogeneous or hybrid configurations (alternated stacking of graphene and boron nitride). At the nanolevel, a synergistic interaction between the layers emerges, not observed at the micro- and macro-scale for graphene armors. This size-scale transition in the impact behavior toward higher dimensional scales is rationalized in terms of scaling of the damaged volume and material strength. An optimal number of layers, between 5 and 10, emerges demonstrating that few-layered 2D material armors possess impact strength even higher than their monolayer counterparts. These results provide fundamental understanding for the design of ultralightweight multilayer armors using enhanced 2D material-based nanocomposites.
我们结合从头算密度泛函紧束缚和有限元模拟研究了二维（2D）材料在 C60 富勒烯分子超高速撞击下的弹道性质。使用石墨烯和二维氮化硼同素异形体作为案例研究，确定了单层膜的临界穿透能。此外，还研究了具有可变层数和层间间距的能量吸收标度律，适用于同质或混合配置（石墨烯和氮化硼交替堆叠）。在纳米尺度上，层间出现协同相互作用，而在石墨烯装甲的微观和宏观尺度上则没有观察到这种相互作用。这种从微观到宏观的尺寸尺度向更高维尺度的冲击行为的转变，可以根据损伤体积和材料强度的标度来解释。出现了一个最佳的层数，在 5 到 10 之间，这表明具有少数层的 2D 材料装甲具有比单层更优异的抗冲击强度。这些结果为使用增强型二维材料基纳米复合材料设计超轻量多层装甲提供了基本的理解。
