Important: AMPP System Update February 27 - March 11 – Limited Access to AMPP Digital Services. Act Now to Avoid Disruptions! - Learn More
The double-cantilever beam (DCB) test method standardized in NACE TM0177-2016 is being increasingly applied as a quality assurance test to specify the performance of carbon and low-alloy steels for the sour service. The DCB test can contribute to the quantitative evaluation of the fracture toughness in a specific environment by assessing the crack arrest of a pre-cracked specimen. The test method has been discussed from the viewpoint of specimen geometries, such as side-groove root configurations, which are considered to change the stress concentration and thereby prevent the edge crack occurrence. In this paper, the DCB test was conducted with the current standard V-type and a proposed U-type side-groove configuration in order to compare crack propagation behaviors, by using in-situ ultrasonic observations and K1SSC values with 110 ksi sour grade material in a simulated sour environment. Crack propagation began a few hours after initiation of the test in NACE Solution A saturated with 1 bar H2S gas. The crack propagation rate and the final crack length were similar between the DCB specimens with the V-type and U-type side grooves. The obtained K1SSC values were almost the same, regardless of the side-groove configuration. In addition, the frequency of edge cracks for DCB specimens with theU-type side groove was lower than that of those with the V-type side groove. Therefore, it is appropriate to use the proposed U-type side-groove configuration for the DCB test.
Key words: Double Cantilever Beam, Sulfide stress cracking, FEA, K1SSC, NACE TM0177-2016 Method D, Compliance, Crack start position.
Available fracture toughness (FT) test methodologies are reviewed in this publication to compare their details.
We are unable to complete this action. Please try again at a later time.
If this error continues to occur, please contact AMPP Customer Support for assistance.
Error Message:
Please login to use Standards Credits*
* AMPP Members receive Standards Credits in order to redeem eligible Standards and Reports in the Store
You are not a Member.
AMPP Members enjoy many benefits, including Standards Credits which can be used to redeem eligible Standards and Reports in the Store.
You can visit the Membership Page to learn about the benefits of membership.
You have previously purchased this item.
Go to Downloadable Products in your AMPP Store profile to find this item.
You do not have sufficient Standards Credits to claim this item.
Click on 'ADD TO CART' to purchase this item.
Your Standards Credit(s)
1
Remaining Credits
0
Please review your transaction.
Click on 'REDEEM' to use your Standards Credits to claim this item.
You have successfully redeemed:
Go to Downloadable Products in your AMPP Store Profile to find and download this item.
The Double Cantilever Beam (DCB) test method standardized in ANSI 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 FEA and experimental approach was performed. K1SSC of DCB tests should be evaluated in the same crack start positions from the view point of a fracture mechanics.