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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

Picture for Klimit of C110 in NACE TM0177 Solution A: Influence of the Specimen Size and the Initial Crack Lengt
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Product Number: 51314-3822-SG
ISBN: 3822 2014 CP
Author: Florian Thebault
Publication Date: 2014
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NACE TM0177 Method D (DCB) test allows the determination of the critical stress intensity factor KISSC below which the propagation of a sulfide stress crack in the material is stopped. For a given severity of the sour medium (pH PH2S T [Cl-]…) KISSC is not a material constant since it depends for instance on the testing arm displacement. Recently the Klimit concept was proposed to circumvent this issue. Klimit is a conservative KISSC value and would be more representative of the material corrosion resistance.A previous communication highlighted that the value of KIapplied is sensitive to the calculation procedure. Consequently Klimit can be over or underestimated. The present work focused on the influence of experimental parameters on Klimit: the DCB specimen size and the initial crack length. While the influence of those both parameters on KISSC is now well documented this has not been yet the case for Klimit.Klimit values have been obtained on a C110 casing in NACE TM0177 Solution A for three distinct situations:• with 9.53 mm thick specimens• with 9.53 mm thick specimens that were pre-cracked by fatigue.• 4.76 mm thick specimens 
NACE TM0177 Method D (DCB) test allows the determination of the critical stress intensity factor KISSC below which the propagation of a sulfide stress crack in the material is stopped. For a given severity of the sour medium (pH PH2S T [Cl-]…) KISSC is not a material constant since it depends for instance on the testing arm displacement. Recently the Klimit concept was proposed to circumvent this issue. Klimit is a conservative KISSC value and would be more representative of the material corrosion resistance.A previous communication highlighted that the value of KIapplied is sensitive to the calculation procedure. Consequently Klimit can be over or underestimated. The present work focused on the influence of experimental parameters on Klimit: the DCB specimen size and the initial crack length. While the influence of those both parameters on KISSC is now well documented this has not been yet the case for Klimit.Klimit values have been obtained on a C110 casing in NACE TM0177 Solution A for three distinct situations:• with 9.53 mm thick specimens• with 9.53 mm thick specimens that were pre-cracked by fatigue.• 4.76 mm thick specimens 
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