L52324 Characterization of Anisotropic Pipe Steel Stress-Strain Relationships Influence On Strain Demand

This report summarizes a PRCI research project aimed at evaluation of the effects of anisotropy and the shape of pipe steel stress-strain relationships on pipeline strain demand for X80 and X100 UOE pipe. The research included: a review of pipeline industry literature on the subject matter; a discussion of pipe steel plasticity concepts for UOE pipe; characterization of the anisotropy and stress-strain curve shapes for both conventional and high strain pipe steels; development of representative analytical X80 and X100 stress-strain relationships; and evaluation of a large matrix of ground-movement induced pipeline deformation scenarios to evaluate key pipe stress-strain relationship shape and anisotropy parameters.

One goal of this research was to apply the findings toward guidance for supplemental pipe material specifications aimed at minimizing undesirable effects of anisotropy and stress-strain curve shape on pipe deformations under displacement-controlled loads.