Chiral Fe nanotubes with both negative Poisson's ratio and Poynting's effect. Atomistic simulation
IA Bryukhanov and VA Gorodtsov and DS Lisovenko, JOURNAL OF PHYSICS- CONDENSED MATTER, 31, 475304 (2019).
Using atomistic calculations, we study the features of uniaxial deformation of nanotubes made of rolled-up thin 010 plates of Fe cubic crystals. We find that within a certain range of chiral angles these nanotubes have both negative Poisson's ratio and axial strain-induced torsion (reverse Poynting's effect) during tension and compression. The maximum torsion and the minimum value of Poisson's ratio are observed at chiral angles of 25 degrees and 45 degrees, respectively. We show that Young's modulus of the chiral Fe nanotubes increases with a chiral angle. We demonstrate that in the discussed range of nanotube sizes there is a satisfactory correspondence between the results obtained by molecular statics and anisotropic theory of elasticity.
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