Analysis of a resin socket termination for a wire rope
A finite element model to determine the socket stresses and resin pressures in a typical resin socket termination for a wire rope has been developed. This model takes account of the relative movement between the socket and the resin cone that occurs when a termination is under load. To verify the accuracy of the model, computed socket strains were compared with strain measurements both on a full-scale termination and on a laboratory-scale model. As a result of these comparisons, modifications were made to the finite element model to improve its accuracy. lt was concluded that the wires were held in the socket by frictional forces which were effective only in the front half of the socket basket length. This conclusion was verified by further laboratory tests. lt was therefore deduced that manufacturing defects in the back half of the socket would not reduce the strength of the termination, while defects in the front half are much more significant. This was also demonstrated by laboratory tests for both quasi-static and fatigue loading. The predominance of load transfer in the front half of the socket, found essential to the accuracy of the finite element model, was therefore considered to reflect the physical operation of the system, for which an explanation is offered in terms of resin shrinkage during cure.
Author(s): J.E. Bradon, C.R. Chaplin & l.M.L. Ridge