Journal
ACTA MATERIALIA
Volume 61, Issue 16, Pages 6276-6289Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2013.07.011
Keywords
Fracture; Quasi-brittle; X-ray tomography; Digital volume correlation; Cohesive zone model
Funding
- Diamond Light Source
- Joint Engineering, Environmental and Processing [112 - JEEP, EE7119]
- Oxford Martin School
- Linacre College, Oxford through a Junior Research Fellowship
- Engineering and Physical Sciences Research Council [EP/K032518/1, EP/H018921/1, EP/G035059/1, EP/I020691/1, EP/H003215/1] Funding Source: researchfish
- EPSRC [EP/H018921/1, EP/K032518/1, EP/I020691/1, EP/H003215/1, EP/G035059/1] Funding Source: UKRI
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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. (C) 2013 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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