Stress distribution and elastic properties of duplex reinforcing elements with non-fracturing helical cores

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Abstract
The potential engineering advantages of two-part core/sheath reinforcing elements in which core fracture is prevented by means of a stress-controlled decoupling mechanism are outlined. Studies have been made of the longitudinal stress distributions occurring between core and sheath in various loading conditions. A very significant enhancement of the core longitudinal stiffness is observed when it is contained within the tube. It is suggested that this is due to the large residual lateral strains developed in the two parts of the reinforcing member coupled with the very large effective Poisson's ratio of the core.