Study On Shear Properties Of Boron Nitride Sheet Using Molecular Dynamics Simulation

Since the2010Nobel Prize in Physics was awarded to two professors in the University of Manchester in the United Kingdom on graphene, graphene has been widely concerned. Research hot spot of nanomaterials rapidly changed from one dimensional nanomaterial into two dimensional nanomaterials. As the thinnest two-dimensional materials-boron nitride sheet-has a very good nature of electromagnetic and mechanical properties. Many occasions that require the application of the two-dimensional film boron nitride film can be used to operate. Based on graphene nano electromechanical systems can also be largely promoted and improved by boron nitride sheet..This paper focuses on the mechanical behavior and ripple characteristics of boron nitride thin films under shear, we use molecular dynamics and continuum mechanics to study the mechanical characteristics of the two-dimensional film. This paper studies the impact of the size of the film and the ambient temperature of the film on shear modulus, failure stress, failure strain, the height of the ripple, ripple wavelength.In molecular dynamics simulations the Tersoff many-body potential was used to describe the chemical bond between atoms of boron nitride thin film. Analog boron nitride film stretching process, consistent results and others, to verify the correctness of our approach. Then, by molecular dynamics simulation of the shearing process. Obtained by molecular dynamics simulations film shear modulus decreased with the increase in size and temperature, failure strain and failure stress also has been declining. And mechanical characteristics are more sensitive to temperature. Decline as the size increases, the shear modulus of the film but in the end will tend to a finite value.Comprehensive continuum theory and molecular dynamics are two ways to study the ridge character. Ridge character has a great influence on the electrical properties of boron nitride films. Studies have shown that the continuum theory overestimates the height of the wrinkle, wrinkle height is not so high. Molecular dynamics can be very accurate prediction of the mechanical properties of the film under the action of shear and tensile.