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In this paper the influence of various sidegroove root configurations on edge fracture Double Cantilever Beam tests and FEM analysis results were focused upon because different types of sidegroove roots are considered to change the stress concentration at the bottom of sidegroove and therefore affects the incidence of edge crack occurrence in the DCB test.
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DCB compliance for the chevron notch 32 mm electric discharge machining (EDM) and 35 mm EDM crack starters were measured and compared. The program consisted of multiple direct load versus arm displacement measurements for all three configurations.
In this paper, the influence of various side-groove root configurations on critical stress intensity factor for sulfide stress cracking (KISSC) and finite-element analysis (FEA) results were focused upon.
The paper describes the development of the methodology for the full ring, full thickness 4-point bend (4PB) and large scale DCB specimens and the results obtained from these tests.
Due to the increasing interest of the O&G industry on high grade tubulars working at high pressures, the assessment of operational conditions of Oil country Tubular Goods (OCTG) subjected to Sulfide Stress Cracking (SSC) is of particular importance.
AMPP adopts different test methods to evaluate material susceptibility to SSC in wet H2S environments, for which, Method D according to NACE TM0177 determines a quantitative value of material resistance using a Double Cantilever Beam (DCB) specimen that can be used for design and qualification purposes. This is a crack arrest type fracture mechanics test that can be traced back to the work of Heady in 1977 in which the material resistance to propagation of environmental cracks is expressed in terms of a critical stress intensity factor, KIssc.
HISTORICAL DOCUMENT.
This standard addresses the testing of metals for resistance to cracking failure under the combined action of tensile stress and corrosion in aqueous environments containing hydrogen sulfide (H2S). This phenomenon is generally termed sulfide stress cracking (SSC) when operating at room temperature and stress corrosion cracking (SCC) when operating at higher temperatures. In recognition of the variation with temperature and with different materials this phenomenon is herein called environmental cracking (EC). For the purposes of this standard, EC includes only SSC, SCC, and hydrogen stress cracking (HSC).
The Double Cantilever Beam test method in ANSI NACE TM0177 is increasingly applied as a QA test. In this analysis, influence of various side-groove root configurations (considered to change the stress concentration) on KISSC and Finite Element Analysis results were focused upon.