Journal
COMPOSITES PART B-ENGINEERING
Volume 41, Issue 6, Pages 462-474Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesb.2010.05.007
Keywords
Polymer-matrix Composites (PMCs); Fracture; Impact behavior; Mechanical testing digital image correlation
Funding
- NASA-LaRC [NNX07AC64A]
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Strain-rate effects on fracture behavior of unidirectional composite materials are studied. Single-edge notched multi-layered unidirectional graphite composites (T800/3900-2) are investigated to examine fracture responses under static and dynamic loading conditions using a digital speckle correlation method. The fracture parameters for growing cracks are extracted as a function of fiber orientation. A 20 digital image correlation (DIC) method is used to obtain time-resolved full-field in-plane surface displacements when specimens are subjected to quasi-static and impact loading. Stress intensity factor and crack extension histories for pure mode-I and mixed mode cases are extracted from the full-field displacements. When compared to the dynamic stress intensity factors at crack initiation, the static values are found to be consistently lower. The stress intensity factor histories exhibit a monotonic reduction under dynamic loading conditions whereas an increasing trend is seen after crack initiation under quasi-static loading cases. This is potentially due to dominant crack face fiber bridging effects in the latter cases. (C) 2010 Elsevier Ltd. All rights reserved.
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