Journal
POLYMER TESTING
Volume 28, Issue 6, Pages 612-617Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymertesting.2009.05.003
Keywords
Delamination; Fracture; Fractography; Fatigue; Crack
Funding
- Spanish Ministry of Science and Technology [MAT2007-60696]
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The mode I and mode II interlaminar fracture surfaces of a unidirectional AS4/8552 carbon/epoxy laminate were studied by means of SEM microscopy and numerical analysis in order to correlate the surface appearance with the stress state. SEM micrographs of fractured surfaces showed that the most predominant fractographic features in modes I and II were 'river markings' and 'hackle markings' respectively. Finite Element Analysis (FEA) showed that the principal tensile stress direction near the crack tip was perpendicular to the 'hackle' or 'stacked lamellae' microstructure and at 45 degrees to the fracture plane. As was observed by other authors, these results suggest that matrix microcracking perpendicular to the principal stress direction is the driving mechanism forming the 'hackle marking' microstructure. (C) 2009 Elsevier Ltd. All rights reserved.
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