Arc Hyperbolic sine creep theory applied to torsion-tension member of circular cross section

A multiaxial creep theory is presented in this paper which will predict the total deformations of a load-carrying member at any specified time after load. Load-deformation relations are derived based on the assumption that the isochronous stress-strain diagram of the material can be represented by an arc hyperbolic sine function [see, eq (2)]. A closed solution was obtained for the torsion-tension member considered in this investigation. Experimental data were obtainsed for nylon and high-density polyethylene members in a controlled-environment room and for 17-7PH stainless-steel members at 972° F. Good agreement was found between theory and experiment.Formerly with Department of Theoretical and Applied Mechaaics, University of Illinois, Urbana, Ill.Paper was presented at 1963 SESA Spring Meeting held in Seatle, Wash., on May 8–10.