Post-impact compressive load carrying capacity of fibre-metal laminate plates

Abstract eng:
Compression buckling and postbuckling behaviour of fibre-metal laminate plates with a single delamination has been investigated in order to estimate the compressive load carrying capacity of such plates. Drop-weight impact tests were performed to induce delaminations in fibre-metal laminate plates and subsequent ultrasonic inspection provided the contours of delaminated regions. These shapes of delaminations together with circular delamination shape were employed in the following finite element simulations of compressively loaded delaminated plates. Two load-limiting events were considered: yielding of metal layers and delamination growth initiation. It was found, that delaminations were not likely to grow before the onset of plastic deformation. The effect of delamination shape and buckling mode shape on the energy release rate values is also discussed.

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