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The Effect of Crack Start Positions on NACE TM0177 DCB Elastic Compliance

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.

Product Number: 51319-12842-SG
Author: Jun Nakamura
Publication Date: 2019
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