Impact induced fracture of glass bars

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Abstract
Soda lime and pyrex glass bars are impacted with glass bars at impact velocities to 300 m/sec. Manganin gauges are embedded 10 diameters away from the impact face to measure stress‐time profile. An Imacon camera, at a framing rate of 105 f/s, is used to monitor the impact induced frature front in the bar. Glass bars fail through a fracture or failure front propagating across the cross section of the bar. The speed of the fracture front in pyrex bar is a function of the impactor velocity. The speed increases from 2.3 mm/μs, corresponding to impact velocity of 125 m/s, to 5.2 mm/μs for impact velocity of 330 m/s1. In two experiments a 1.6 mm thick round aluminium disk was glued on the impact face of the target bar. In the experiment on soda lime glass bar target in this configuration we observed two fracture fronts, one originating at the impact face and the other originating about 30 μs after the impact, from the gauge interface 10 diameters away, where the manganin gauge is embedded.

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