Abstract
A modified DCB specimen has been used to study the dynamic Mode-I delamination fracture toughness of an AS4/3501-6 carbon/epoxy composite at high crack-propagation speeds. A strip of FM-73 adhesive film was placed at the tip of a pre-crack created during laminate lay-up. The adhesive strip substantially increased the crack-initiation toughness so that after initiation an unstable crack-propagation was produced and high crack-propagation speeds were achieved. Specimens were loaded at a constant displacement rate of 0·1mms−1 on an MTS machine. Crack extension was monitored by means of a conductive circuit placed along the path of the propagating crack. Continuous records were obtained for the load, deflection and crack extension. The strain-energy release rate was calculated by using plate finite elements based on the crack-propagation data. It was found that the critical dynamic strain-energy release rate for crack speeds up to 200ms−1 is a constant and is equal to the critical static strain-energy release rate.
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