Abstract
In this work we present some preliminary results of optical experiments performed on dynamically deforming thick polymeric-composite laminate plates. The composites used for this study are unidirectional graphite/epoxy fiber-reinforced composite plates, consisting of 48 plies (6 mm thickness). Edge-notched plates are impact loaded in a one-point bend configuration using a drop-weight tower. The lateral shearing interferometer of coherent gradient sensing (CGS), in conjunction with high-speed photography, is used to obtain real-time interferograms of the near-tip deformation during dynamic crack initiation and growth. Initiation fracture toughness data are obtained and reported. Crack growth speeds of 900 m s −1 are recorded and significant dynamic effects are observed through emission of stress waves from the propagating crack tip.
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