Research on Strain Rate Effect of the Mechanical Properties of Graphene Sheet Containing Randomly Distributed Defects
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RESEARCH PAPER
Research on Strain Rate Effect of the Mechanical Properties of Graphene Sheet Containing Randomly Distributed Defects Yingjing Liang1 · Shi Huan2 Received: 25 October 2018 / Accepted: 3 September 2019 © Shiraz University 2019
Abstract Strain rate effects on the mechanical properties of graphene sheets (GSs) contain randomly distributed defects investigated by molecular dynamics simulations, and the results have been discussed. The strain rate has a significant effect on the tensile strength, while fracture strain and failure mechanism of GSs and elastic modulus are insensitive to the strain rate. At room temperature of 300 K, GSs without defects show that brittle failure is at a low strain rate and linear hardening is at a high strain rate. The strain rate is higher, the GSs are harder. However, GSs with a large number of randomly distributed defects only show brittle failure under high temperature. The tensile strength and fracture strain increase with the strain rate increasing. The tensile strength of GSs without defects has a linear relation to the logarithm of the strain rate, but the GSs with defects do not exhibit this phenomenon because the defects are sensitive to the strain rate. The present study provides a theoretical optimization method for the preparation and performance of GSs. Keywords Strain rate · Mechanical properties · Graphene sheets · Molecular dynamics simulations
1 Introduction Graphene sheet (GS) is the representative material of carbon nanomaterial, which has attracted wide attention (Novoselov et al. 2004). Due to its superior mechanical, electrical, and thermal properties, GSs have spurred many new applications in materials enhancement, sensors, drug transportation, nanoelectronics, and nanodevices (Miao et al. 2014; Heersche et al. 2007; Zhou et al. 2014; Zhu and Ertekin 2014; Schmiedova et al. 2017; Levin et al. 2016; Jung et al. 2017; Singh et al. 2017). These applications are closely related to the mechanical properties of GSs. It has been illustrated that perfect GSs exhibit excellent mechanical properties. However, defects, such as atomic vacancy defects (Wang et al. 2012a), inevitably emerge in the preparation and synthesis of GS, which will greatly reduce the mechanical property (Zandiatashbar et al. 2014). Graphene sheets have physical properties such as impact resistance and high mechanical * Shi Huan [email protected] 1
School of Civil Engineering, Guangzhou University, Guangzhou 510006, People’s Republic of China
Earthquake Engineering Research Test Center, Guangzhou University, Guangzhou 510006, People’s Republic of China
2
strength. Graphene sheet products have been widely used in the field of mechanical performance enhancement. Therefore, the study of the defective GS properties is important, and it is the basis for the application of a nanocomposite and nanometer device. The numerical simulation method such as molecular dynamics (MD) is widely used in the mechanical properties investigation because of the conduction difficulty in nano-level
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