Mechanisms of interlayer friction in low-dimensional homogeneous thin-wall shell structures and its strain effect.

Due to the multi-factor coupling effect, the rule of interlayer friction in low-dimensional homogeneous thin-wall shell structures is still unclear. Double walled carbon nanotubes (DWCNTs) having a typical low-dimensional homogeneous thin-wall shell structure are selected for this study. The interlayer friction of numerous chiral DWCNTs is investigated using molecular dynamics simulations to systematically analyze and understand the coupling mechanisms of various factors in interlayer friction.

Morphological changes in flatfoot: a 3D analysis using weight-bearing CT scans.

Background: Flatfoot is a condition resulting from complex three-dimensional (3D) morphological changes. Most Previous studies have been constrained by using two-dimensional radiographs and non-weight-bearing conditions. The deformity in flatfoot is associated with the 3D morphology of the bone.

Study of torsional strain effect on dynamic behavior of carbon nanotube thermal actuator.

In this paper, a regulation method through torsional strain effect is proposed for carbon nanotube linear thermal actuators. The effects of torsional strain effect on the linear driven performance of linear actuators are systematically studied by molecular dynamics method, and the effect mechanism is revealed as well. It was found that the torsional strain affects the thermal driving force and the friction effect by changing the spacing between the carbon tubes and lattice vibration modes, then further affects the linear driving characteristics.

Size and temperature effect of Young's modulus of boron nitride nanosheet.

Boron nitride nanosheets (BNNSs), a new type of wide bandgap nanomaterial, has attracted great attention due to their excellent properties and potential applications. Thus, it is necessary to have a comprehensive understanding of the mechanical properties of BNNSs in various working conditions. This paper presents an analytical model based on molecular mechanics to study the size effect and temperature effect on the Young's modulus of BNNSs.

Mechanism of axial strain effects on friction in carbon nanotube rotating bearings.

A systematic study of axial strain effects on friction in carbon nanotube bearings is conducted in this paper. The relationships between friction and axial strains are determined by implementing molecular dynamics simulations. It is found that the dependence of friction on velocity and temperature is altered by axial strains.

Strain effects on rotational property in nanoscale rotation system.

This paper presents a study of strain effects on nanoscale rotation system consists of double-walls carbon nanotube and graphene. It is found that the strain effects can be a real-time controlling method for nano actuator system. The strain effects on rotational property as well as the effect mechanism is studied systematically through molecular dynamics simulations, and it obtains valuable conclusions for engineering application of rotational property management of nanoscale rotation system.

Controllable nanoscale rotating actuator system based on carbon nanotube and graphene.

A controllable nanoscale rotating actuator system consisting of a double carbon nanotube and graphene driven by a temperature gradient is proposed, and its rotating dynamics performance and driving mechanism are investigated through molecular dynamics simulations. The outer tube exhibits stable pure rotation with certain orientation under temperature gradient and the steady rotational speed rises as the temperature gradient increases. It reveals that the driving torque is caused by the difference of atomic van der Waals potentials due to the temperature gradient and geometrical features of carbon nanotube.

Study on wrinkling in graphene under gradient shear by molecular dynamics simulation.

The formation and development mechanisms of wrinkles in a rectangular single layer graphene sheet (SLGS) subjected to in-plane gradient shear displacements are investigated through molecular dynamics (MD) simulations. The growth and propagation process of the SLGS wrinkling is elucidated by the developing atomic out-of-plane displacements of the key atoms. It reveals that the shape of SLGS and loading condition have a significant effect on the SLGS wrinkling deformation.