A preliminary investigation of the properties of plastically-deforming two-part composite reinforcement

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Abstract
Studies have been made of the behaviour of metal tubular reinforcing elements having a high yield strength and limited ductility. When incorporated in a brittle resin matrix, these elements normally fail with the occurrence of very limited ductile deformation on each side of a matrix crack. It has been observed that immediate failure can be prevented by the presence of a loosely fitting cylindrical core of suitable dimensions. In these circumstances the initially necked-down region propagates progressively along the length of the tube allowing the reinforcing member to extend by a considerable amount.

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