TESTING OF HYBRID NICKEL-POLYURETHANE FOAMS AT HIGH STRAIN-RATES USING HOPKINSON BAR AND DIGITAL IMAGE CORRELATION

TESTING OF HYBRID NICKEL-POLYURETHANE FOAMS AT HIGH STRAIN-RATES USING HOPKINSON BAR AND DIGITAL IMAGE CORRELATION

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In this paper Split Hopkinson pressure bar (SHPB) was used for dynamic estes c6-5 engines bulk pack testing of nickel coated polyurethane hybrid foams.The foams were manufactured by electrodeposition of a nickel coating on the standard open-cell polyurethane foam.High strength aluminium alloy bars instrumented with foil strain-gauges were used for dynamic loading of the specimens.Experiments were observed using a high-speed camera with frame-rate set to approx.

100-150 kfps.Precise synchronisation of the high-speed camera and the strain-gauge record was achieved using michael harris sunglasses a through-beam photoelectric sensor.Dynamic equilibrium in the specimen was achieved in all measurements.Digital image correlation technique (DIC) was used to evaluate in-plane displacements and deformations of the samples.

Specimens of two different dimensions were tested to investigate the collapse of the foam structure under high-speed loading at the specific strain-rate and strain.