tailieunhanh - The size effect in mechanical properties of boron nitride nanotube under tension

This work aimed at investigating the mechanical properties of boron nitride nanotubes (BN-NTs) under uniaxial tension using atomic finite element method with Tersoff potential. The zigzag and armchair nanotubes with different length and diameter are considered for researching effect on mechanical behavior of BN-NTs. | Vietnam Journal of Science and Technology 55 (4) (2017) 475-484 DOI: THE SIZE EFFECT IN MECHANICAL PROPERTIES OF BORON NITRIDE NANOTUBE UNDER TENSION Nguyen Danh Truong School of Mechanical Engineering, Hanoi University of Science and Technology No. 1 Dai Co Viet Road, Hanoi, Vietnam. * Email: Received: 1 April 2017; Accepted for publication: 15 May 2017 ABSTRACT This work aimed at investigating the mechanical properties of boron nitride nanotubes (BN-NTs) under uniaxial tension using atomic finite element method with Tersoff potential. The zigzag and armchair nanotubes with different length and diameter are considered for researching effect on mechanical behavior of BN-NTs. It is found that Young’s modulus of BN-NTs is independent of the tubular length, but slightly increases when the diameter goes rise. At the given strain, axial stress in the armchair tubes is higher than that in the zigzag ones. This paper will provide useful information about the mechanical properties and failure behaviors of BNNTs for their applications. Keywords: atomistic simulation; tension; Boron nitride nanotubes, mechanical properties. 1. INTRODUCTION In the past decades, the discovery of the superior mechanical and other physical properties in tubular nanomaterials such as carbon nanotubes (CNTs) have triggered great interest in their possible engineering applications, . nanomechanical resonators [1 - 3], reinforcement for the nanocomposites [4 - 6]. Similar to that of CNTs [7], boron nitride nanotubes (BN-NTs) [8] can be geometrically formed by rolling up a hexagonal boron nitride (BN) layer in which alternating B and N atoms entirely substitute for C atoms as shown in Figure 1. Various techniques have been used to synthesize BN-NTs, including arc-discharge [8 - 10], chemical vapor deposition [11 - 14], laser ablation [15 - 17], etc. BN-NTs exhibit good mechanical properties with high elastic modulus of ~ - 1 TPa [18