The Double Cantilever Beam (DCB) test method standardized in NACE TM0177 is increasingly applied as a quality assurance test to specify the performance of carbon and low alloy steels for sour service. The DCB test method has been modified and specified tightly from the view point of specimen geometry, test environment, and initial stress intensity factor controlled by arm displacement to obtain highly repeatable test results.

NACE TM0177 2016 method D has various types of starter notch configurations on DCB specimens. Crack start position shifted change specimen of EDM notch has been in accordance with NACE TM0177 since 2016 and the distance from a pin hole to a crack starter has been different.

Previous research the influence of crack starter position on K1SSC has been revealed using Finite Element Analysis (FEA) and DCB tests. In this paper, in order to clarify the applicability of compliance curve in TM0177-2016 and propose the new compliance curves for shift changed chevron notch type DCB specimens with U-groove, FEA and experimental approach was performed.

Subject
Crack growth, Materials, Stress intensity, Compliance, Sour environments, Notches, Crack propagation, Stress cracking, Crack length, Steel, Fatigue, Cracks, Hydrogen stress cracking
Keywords:
Double Cantilever Beam, Sulfide stress cracking, FEA, K1SSC, NACE TM0177 method D, compliance, Crack start position
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2019
Association for Materials Protection and Performance (AMPP)
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