If the initial delamination lies on the midplane, local buckling does not occur and the initiation of crack propagation appears to be dominated by Mode II fracture. If the initial delamination is placed near the top of bottom surface of the laminate, local buckling of the delaminated plies may cause instability of the crack. Results show that the through the thickness position of the embedded crack can significantly affect the dominant mechanism and the threshold impact velocity for the onset of crack movement. The crack propagation speeds were estimated from the photographs. The threshold impact velocities required to initiate dynamic crack propagation in laminates with varying initial crack positions were determined. The dynamic motion was produced by impacting the beamlike laminate specimen with a silicon rubber ball. Dynamic delamination crack propagation in a graphite/epoxy laminateĭynamic delamination crack propagation in a (90/0) 5s Graphite/Epoxy laminate with an embedded interfacial crack was investigated experimentally using high speed photography.
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