论文标题
二维固体的凹痕：几何和材料非线性的特征
Indentation of two-dimensional solids: The signatures of geometrical and material nonlinearity
论文作者
论文摘要
经常通过悬浮在基板上的孔上的薄片上进行压痕测试，进行超薄实心板的材料表征，包括二维材料，例如石墨烯等材料。虽然这种“悬浮凹痕”是测量此类材料的拉伸（二维）模量之类特性的方便方法，但表面上相似的系统的实验报告了非常不同的材料特性。在本文中，我们提出了假设弹性行为的压痕过程的建模研究。特别是，我们研究了报告的差异可能是由不同的几何参数和/或非奇克变形引起的，这导致系统探索具有几何或物质起源的非线性的系统。
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.
