Indentation of suspended two-dimensional solids: The signatures of geometrical and material nonlinearity
Indentation of suspended two-dimensional solids: The signatures of geometrical and material nonlinearity
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DOI：
10.1016/j.jmps.2020.104109
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发表时间：
2020-02
影响因子：
5.3
通讯作者：
Thomas G. J. Chandler;D. Vella
中科院分区：
文献类型：
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作者：
Thomas G. J. Chandler;D. Vella
超薄固体片（包括石墨烯等二维材料）的材料表征通常通过对悬浮在基底中的孔上方的薄片进行压痕测试来进行。虽然这种“悬浮压痕”是测量这些材料的拉伸（二维）模量等特性的方便方法，但在表面上类似的系统上进行的实验报告了非常不同的材料特性。在本文中，我们提出了一个建模研究，这个压痕过程假设弹性行为。特别是，我们调查的可能性，报告的差异可能会产生不同的几何参数和/或非胡克变形，这导致系统探索非线性几何或材料的起源。
The material characterization of ultra-thin solid sheets, including two-dimensional materials like graphene, is often performed through indentation tests on a flake suspended over a hole in a substrate. While this ‘suspended indentation’ is a convenient means of measuring properties such as the stretching (two-dimensional) modulus of such materials, experiments on ostensibly similar systems have reported very different material properties. In this paper, we present a modelling study of this indentation process assuming elastic behaviour. In particular, we investigate the possibility that the reported differences may arise from different geometrical parameters and/or non-Hookean deformations, which lead to the system exploring nonlinearities with geometrical or material origins.