The Double Cantilever Beam (DCB) test method standardized in ANSI(1) 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 can contribute to the quantitative evaluation of fracture toughness in a specific environment via assessment of the crack arrest of a pre-cracked specimen. The 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. In this paper, the influence of various side-groove root configurations on edge fracture DCB tests and Finite Element Method (FEM) analysis results were focused upon, because different types of side-groove roots are considered to change the stress concentration at the bottom of the side-groove and therefore affect the incidence of edge crack occurrence in the DCB test. Decreasing the incidence of edge cracking with increasing side-groove root is discussed from the viewpoint of fracture mechanics.

Subject
Test methods, Materials, Stress intensity, Geometry, Crack initiation, Crack propagation, Stress cracking, Crack length, Steel, Fatigue, Sulfide stress cracking, Fracture, Cracks
Keywords:
Double Cantilever Beam, Edge fracture, Sulfide stress cracking, FEM
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2016
Association for Materials Protection and Performance (AMPP)
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