Method for solving critical strain of graphene

Abstract

A graphene critical strain solving method applies a load in an Armchair direction or a Zigzag direction to graphene, and comprises the following steps: S1, determining a constitutive relation when the graphene is subjected to the load according to a lowest energy principle; and S2, judging the critical strain of the graphene according to abnormal changes of mechanical property parameters such as Young modulus and Poisson's ratio. According to the method, on the basis of the Cauchy-Born criterion, the strain energy, the Young modulus and the Poisson ratio of graphene are determined through a continuum mechanics method. A constitutive relation is determined when the graphene is loaded according to a lowest energy principle, and a specific structure of the graphene subjected to the load is determined. Through the method, the critical strain of the graphene under the plane load can be calculated more conveniently, and the method can be further expanded to the solution of the loaded critical strain of a novel two-dimensional material.

Description

technical field

[0001] The invention relates to the field of two-dimensional nanomaterials, in particular to a new method for solving the critical strain of graphene. Background technique

[0002] In 2004, humans obtained graphene for the first time using micromechanical exfoliation. Due to its excellent mechanical, thermal, electrical, magnetic and acoustic properties, it is expected to be widely used in high-performance nanoelectronic devices, composite materials, field emission materials, gas sensors, energy storage, etc. Potential new materials. With the successive discoveries of silicene and germanene, two-dimensional materials represented by graphene have become the new stars that scientists are most concerned about in industries such as looking for future electronics and composite materials. Therefore, a comprehensive grasp and in-depth understanding of the mechanical properties play an irreplaceable role in the development and application of the entire graphene-lik...

Images