Dispersion equations of torsional modes in three different two-layer pipes are obtained by means of analyzing different stress and displacement boundary conditions of these structures.

Torsional mode is one of the types of ultrasonic guided waves in pipes and it can be used to detect different kinds of defects.

Dispersion and attenuation characteristics of torsional modes of ultrasonic guided wave in pipe with viscoelastic coating are investigated.

Conditions of Effect of Screw Torsion Deformation to Transmission Rigidity;

Bar DZ4 specimens after torsion deformation were heat treated at 1220℃for 4 hours in order to obtain recrystallization layer at the surface,and low cycle fatigue property experiments to the specimens after heat treatment were carded out.

By the thin shell theory the fundamental equations for axisymmetrical torsional deformation Of conical shells are investigated, the analytical formulas of stresses and displacements are derived, and for the truncated conical shell with rigid roof under the torsional couples an exact solution is given.

Eccentric loadings will induce large torsional deformations for the girders of long-span bridges,deteriorating the safety and comfort of moving vehicles of rail transit.

The microstructure evolution of LC4 aluminum alloy with initial coarse grains (>100μm) during high strain hot torsion has been investigated.

Based on the precise strain-displacement relation,the rigid-flexible coupling dynamic equations are derived using the velocity variational principle, in which the virtual power of the torsion force and the inertial torque of the beam element are included and the geometric nonlinearity is taken into account.

Then, the equilibrium differential equations for the twist deformation topic in the mechaniCS of material are extended.