journal article·2025-12-04Open access

Why is the modified wedge-opening-loaded test inadequate for characterizing gaseous hydrogen embrittlement in pipeline steels? A review

Mariano A. Kappes, Diego Palmerio, Jorge Guerrina, Teresa E. Pérez

Corrosion Reviews· Volume 43· Issue 6

Abstract

Abstract International hydrogen pipeline code ASME B31.12 requires the measurement of hydrogen affected fracture toughness using constant load or displacement tests standardized in ASTM E1681. The modified wedge-opening-loaded (WOL) specimen is loaded with a bolt that sets a constant crack mouth opening displacement and the initial stress intensity factor (K Iapp ). In this review paper, the sizing restrictions imposed by the testing procedures are analyzed considering the strength, wall thickness, diameter and toughness of existing and commercially available pipelines. The conclusion is that specimens with the standard geometry for constant displacement test in ASTM E1681 cannot be extracted from most used pipelines. The equations proposed in standards to calculate K Iapp as a function of crack mouth opening displacement cannot be applied and particular expressions must be calculated case by case. Furthermore, loading the specimen to the required K Iapp results in exceedingly large normal stresses in the bolt, increasing the risk of fracture of the bolt during loading of the specimen. Additionally, literature results of pipeline stees tested with the constant displacement in gaseous hydrogen are discussed and their significance is analyzed considering the material performance measured under rising displacement tests in gaseous hydrogen.
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Research context

OpenAlex topics: Hydrogen embrittlement and corrosion behaviors in metals · Material Properties and Failure Mechanisms · Fatigue and fracture mechanics

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Instituto Sabato, UNSAM/CNEA , Av. General Paz 1499, San Martín , Buenos Aires B1650KNA , Argentina

National Commission of Atomic Energy of Argentina , Av. General Paz 1499, San Martín , Buenos Aires B1650KNA , Argentina

National Scientific and Technical Research Council , Godoy Cruz, 2290 , Buenos Aires C1425FQB , Argentina

YPF Tecnología , Av. del Petroleo Argentino 900-1198, Berisso , Buenos Aires , Argentina

TEP Consultora SRL , Buenos Aires , Argentina

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