Investigation of the integral creep equations (cubic nonlinearity) for different loading paths

TLDR: In this paper, expressions for the creep strain obtained in accordance with the Leaderman-Rozovskii theory and in the form of a multiple-integral Volterra series are compared for different loading paths.

Abstract: Expressions for the creep strain obtained in accordance with the Leaderman-Rozovskii theory and in the form of a multiple-integral Volterra series are compared for different loading paths The influence functions are assumed to be symmetrical The strain intensity-time curves are calculated for a complex loading path for which the stress intensity is constant It is found that these curves are nonmonotonic for both linear and nonlinear creep