Journal article
Three-dimensional crack observation, quantification and simulation in a quasi-brittle material
- Abstract:
- To investigate the fracture behaviour of polygranular graphite (a quasi-brittle material), crack propagation in a short bar chevron notched specimen was studied by synchrotron X-ray computed tomography combined with digital volume correlation. Displacements were measured within the loaded test specimen, particularly the three-dimensional (3-D) profile of crack opening displacement. Analysis of the 3-D displacement field confirmed the existence of distributed damage in a fracture process zone, which significantly increased the effective crack length. Finite element simulations affirmed that the measured crack opening profiles could be reproduced using a cohesive zone model, but not with a linear elastic analysis. Comparing the simulation to the experimental results, it was deduced that the critical strain energy release rate varied across the crack front, i.e. the fracture toughness is constraint-dependent. This is proposed to be a general characteristic of quasi-brittle materials. Copyright 2013 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
- Publication status:
- Published
- Peer review status:
- Peer reviewed
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(Preview, Accepted manuscript, pdf, 5.9MB, Terms of use)
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- Publisher copy:
- 10.1016/j.actamat.2013.07.011
Authors
- Publisher:
- Elsevier
- Journal:
- Acta Materialia More from this journal
- Volume:
- 61
- Issue:
- 16
- Pages:
- 6276-6289
- Publication date:
- 2013-09-01
- DOI:
- ISSN:
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1359-6454
- Language:
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English
- Keywords:
- Pubs id:
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pubs:425798
- UUID:
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uuid:f4e57640-ecc1-468c-8fc1-f16546184381
- Local pid:
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pubs:425798
- Source identifiers:
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425798
- Deposit date:
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2013-09-26
- ARK identifier:
Terms of use
- Copyright holder:
- Acta Materialia Inc
- Copyright date:
- 2013
- Notes:
- Copyright 2013 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved. NOTICE: this is the author's version of a work that was accepted for publication in Acta Materialia. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Acta Materialia, 61, 16, (September 2013) DOI#10.1016/j.actamat.2013.07.011
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