Use of Circumferentially Cracked Bar sample for CTOD fracture toughness determination in the upper shelf regime
In this work, the use of circumferentially cracked bar (CCB) sample to determine material fracture toughness in the upper shelf regime for carbon steels has been investigated. Since high fracture toughness materials are known to exhibit extensive crack tip blunting before ductile crack initiation,...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Gruppo Italiano Frattura
2014-10-01
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| Series: | Fracture and Structural Integrity |
| Subjects: | |
| Online Access: | http://www.gruppofrattura.it/pdf/rivista/numero30/numero_30_art_32.pdf |
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| Summary: | In this work, the use of circumferentially cracked bar (CCB) sample to determine material fracture
toughness in the upper shelf regime for carbon steels has been investigated. Since high fracture toughness
materials are known to exhibit extensive crack tip blunting before ductile crack initiation, accurate specimen
design is required to provide realistic fracture toughness measurement. Here, a CCB was designed to have
similar loss of constraint as for SENT sample. Continuum damage mechanics was used to predict the
occurrence of ductile crack initiation and propagation. Finite element analysis was performed to predict
specimen response and to compare computed J-integral crack driving force with measured CTOD. Finally,
experimental tests were performed on X65 carbon steel and the measured critical CTOD was compared with
available fracture data obtained with SENT. |
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| ISSN: | 1971-8993 1971-8993 |