Poynting's effect of cylindrically anisotropic nano/microtubes

The paper analyzes Poynting's effect for chiral cylindrically anisotropic nano/microtubes of cubic, tetragonal and orthorhombic crystals. It is shown based on the solution of a problem on longitudinal tension and torsion of such tubes that there is a linear direct Poynting's effect of tension of a tube in torsion and a linear reverse Poynting's effect of torsion of a tube in tension. Vor nano/microtubes of cubic six-constant tetragonal and orthorhombic crystals both these effects disappear at a zero chiral angle and their dependence on the chiral angle is odd. Vor nano/microtubes of seven-constant tetragonal crystals both the effects are present at a zero chiral angle but disappear at certain nonzero values of the chiral angle.