JSME International Journal Series A Solid Mechanics and Material Engineering
Online ISSN : 1347-5363
Print ISSN : 1344-7912
ISSN-L : 1344-7912
Fracture & Fatigue
Evaluating Hydrogen Stress Cracking of Line Pipe Steels under Cathodic Protection Using Crack Tip Opening Displacement Tests
Naoto HAGIWARAMichel MEYER
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2001 Volume 44 Issue 2 Pages 309-317

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Abstract

Crack tip opening displacement (CTOD, δ) tests were carried out for line pipe steels in buffer solutions, sand, and clay to evaluate initiation of hydrogen stress cracking (HSC) at surface defects in buried pipelines under cathodic protection. Four series of line pipe steels and two series of seam welds showed a similar tendency in cathodic current density (i) versus the critical CTOD (δc) curves, irrespective of types, pH and water content of the soils; δc showed a minimum (δHSC) when i>ith (ith=1mA/cm2) in all the testing conditions. δHSC increased with the increasing fracture toughness of the steel. Fluctuation of cathodic current density influenced δc when the maximum value of cathodic current density (imax) was larger than ith. HSC could be initiated at surface defects in pipelines only when imax>ith and δ≥δHSC.

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© 2001 by The Japan Society of Mechanical Engineers
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