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51318-11129-The effect of side-groove configuration on NACE TM0177 DCB elastic compliance

Picture for The effect of side-groove configuration on NACE TM0177 DCB elastic compliance
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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.

Product Number: 51318-11129-SG
Author: Jun Nakamura / Keiichi Kondo / Hisashi Amaya / Mutsumi Tanida
Publication Date: 2018
Industries: Test Method , Science of Corrosion
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The double-cantilever beam (DCB) test method standardized in ANSI NACE TM0177 is increasingly being 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 by assessing the crack arrest of a pre-cracked specimen. The test method has been modified and specified tightly from the viewpoint 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 KISSC and finite-element analysis (FEA) results were focused upon because different types of V-notched 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. On the contrary, the KISSC value remains unchanged because the K value of different types of V-notched side-groove configurations at the middle of specimen thickness is the same as a standard DCB test specimen. Decreasing the incidence of edge cracking with increasing V-notched side-groove root is discussed from the viewpoint of fracture mechanics.

 

Key words: Double Cantilever Beam, Compliance, side-groove, Edge fracture, Sulfide stress cracking, FEA, K1SSC.

The double-cantilever beam (DCB) test method standardized in ANSI NACE TM0177 is increasingly being 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 by assessing the crack arrest of a pre-cracked specimen. The test method has been modified and specified tightly from the viewpoint 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 KISSC and finite-element analysis (FEA) results were focused upon because different types of V-notched 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. On the contrary, the KISSC value remains unchanged because the K value of different types of V-notched side-groove configurations at the middle of specimen thickness is the same as a standard DCB test specimen. Decreasing the incidence of edge cracking with increasing V-notched side-groove root is discussed from the viewpoint of fracture mechanics.

 

Key words: Double Cantilever Beam, Compliance, side-groove, Edge fracture, Sulfide stress cracking, FEA, K1SSC.

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