A study of helically reinforced cylinders under axially symmetric loads and application to strand mathematical modelling

Abstract

Locally transversely isotropic elastic material can be used in a cylinder configuration in which the material principal direction is helically wound. Stress-strain equations are obtained for such a cylinder under axially symmetric loading: axial force, twisting moment and uniform radial internal and external pressure forces. The equations are generalized to a system of n coaxial tubes with an isotropic core. Finally, it is shown how this can be used to represent the global mechanical behaviour of strand-like systems such as overhead electrical conductors and cables.