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51315-5568-Effects of Initial Notch Length on KIAPPLIED KISSC and KLIMIT in NACE TM0177 DCB Test

Picture for Effects of Initial Notch Length on KIAPPLIED KISSC and KLIMIT in NACE TM0177 DCB Test
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Product Number: 51315-5568-SG
ISBN: 5568 2015 CP
Author: Xin Long
Publication Date: 2015
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It is well known that various arm displacements associated with different initial stress intensity factor KIapplied in DCB test of NACE TM0177 can result in different measured critical stress intensity factor for sulfide stress cracking (KISSC) values in corrosion environments. However other factors such as initial notch tip locations i.e. initial notch length can also affect the KIapplied and that can ultimately affect the KISSC and KLIMIT measurement. This study shows that the effects of initial notch locations with ai/h varying from standard 1.125 (Chevron tip) 1.250 (lined up EDM tip) and 1.375 (current standard EDM tip) to non standard and extended 1.500 and 1.625 in DCB specimens on the KIapplied KISSC and Klimit through experimental testing. Three-dimensional finite element analysis (FEA) was conducted for the compliance and KIapplied analysis of the various specimen configurations. It was found that the variation of notch location has the similar linear effects on KISSC and Klimit as arm displacement has. The Klimit measured by varying initial notch locations is almost identical to the one measured by traditional arm displacement variation. The corresponding sulfide stress cracking mechanism in DCB testing was also discussed. This may suggest a new approach to obtain Klimit by varying notch locations instead of arm displacements for better accuracy and more constant measurements of KISSC.Key words: double cantilever beam (DCB) MR0177 critical stress intensity factor for sulfide stress cracking (KISSC) Klimit initial notch tip locations
It is well known that various arm displacements associated with different initial stress intensity factor KIapplied in DCB test of NACE TM0177 can result in different measured critical stress intensity factor for sulfide stress cracking (KISSC) values in corrosion environments. However other factors such as initial notch tip locations i.e. initial notch length can also affect the KIapplied and that can ultimately affect the KISSC and KLIMIT measurement. This study shows that the effects of initial notch locations with ai/h varying from standard 1.125 (Chevron tip) 1.250 (lined up EDM tip) and 1.375 (current standard EDM tip) to non standard and extended 1.500 and 1.625 in DCB specimens on the KIapplied KISSC and Klimit through experimental testing. Three-dimensional finite element analysis (FEA) was conducted for the compliance and KIapplied analysis of the various specimen configurations. It was found that the variation of notch location has the similar linear effects on KISSC and Klimit as arm displacement has. The Klimit measured by varying initial notch locations is almost identical to the one measured by traditional arm displacement variation. The corresponding sulfide stress cracking mechanism in DCB testing was also discussed. This may suggest a new approach to obtain Klimit by varying notch locations instead of arm displacements for better accuracy and more constant measurements of KISSC.Key words: double cantilever beam (DCB) MR0177 critical stress intensity factor for sulfide stress cracking (KISSC) Klimit initial notch tip locations
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51314-3822-K(limit) of C110 in NACE TM0177 Solution A: Influence of the Specimen Size and the Initial Crack Length

Product Number: 51314-3822-SG
ISBN: 3822 2014 CP
Author: Florian Thebault
Publication Date: 2014
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51315-5856-Effect of High Arm Displacement on DCB Specimen Testing

Product Number: 51315-5856-SG
ISBN: 5856 2015 CP
Author: Sebastian Cravero
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Picture for The Effect of Notch Configuration on NACE TM0177 DCB Elastic Compliance and Recommendations for Futu
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51316-7203-The Effect of Notch Configuration on NACE TM0177 DCB Elastic Compliance and Recommendations for Futu

Product Number: 51316-7203-SG
ISBN: 7203 2016 CP
Author: Karol Szklarz
Publication Date: 2016
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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.
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