The DCB method is a crack arrest test, i.e., the specimen is self-loaded with a wedge and the constant displacement configuration makes the SIF decrease as the crack grows. Thus, KISSC provided from the DCB test could be different from the toughness of a cracked structure under a constant load scenario. The objective of this paper is to present a new experimental method using a compact Single Edge Notched Tension (SENT) specimen for assessing the SIF threshold for crack growth initiation. The test method provides the same framework as Method A of the NACE TM0177 standard. A numerical solution of SIF as a function of load and geometric parameters is derived from Finite Element Analysis. Tests are performed using the DCB and SENT geometries on C110 grade. The obtained results from the two methods are compared and a test protocol for conducting the crack initiation test is proposed.

Subject
Hydrogen induced cracking, Test methods, Materials, Fracture toughness, Stress intensity, Hydrogen content, Geometry, Sour environments, Crack initiation, Crack propagation, Stress cracking, Force, Crack length
Keywords:
DCB, constant load SENT, hydrogen embrittlement
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2021
Association for Materials Protection and Performance (AMPP)
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