Optical techniques for the investigation of the ballistic impact of thin plates

The normal impact of chrome steel spheres upon mild steel and copper plates of various thicknesses was investigated. The bulging of their rear surfaces was monitored during the first 30 μs after impact using stereo digital speckle photography. The experimental data for copper was compared with two p...

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Bibliographic Details
Published in:	International journal of impact engineering Vol. 38; no. 11; pp. 849 - 863
Main Authors:	Prentice, Helen J., Proud, William G., Walley, Stephen M., Field, John E.
Format:	Journal Article
Language:	English
Published:	Kidlington Elsevier Ltd 01-11-2011 Elsevier
Subjects:	Ballistic impact Bulging Carbon steels Copper Digital speckle photography Displacement Exact sciences and technology Fracture mechanics (crack, fatigue, damage...) Fundamental areas of phenomenology (including applications) High-speed photography Measurement and testing methods Optical techniques Physics Plates Solid mechanics Solvents Steels Structural and continuum mechanics Thin plates High-speed photography Ballistic impact Thin plates Digital speckle photography Optical techniques Optical measurement Ultrahigh speed photography Digital image Speckle interferometry Penetration ballistics Mechanical shock
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Summary:	The normal impact of chrome steel spheres upon mild steel and copper plates of various thicknesses was investigated. The bulging of their rear surfaces was monitored during the first 30 μs after impact using stereo digital speckle photography. The experimental data for copper was compared with two path-dependent models, one optimised for annealed and the other for pre-stressed (work-hardened) copper. It was not possible to differentiate between the two copper models using single-point displacement data. However, full-field data revealed clear differences in the shapes of the bulges, with greater global deformation and closer agreement with experiment for the model that included pre-stress. For both mild steel and copper, thin plates resulted in localised bulging whilst thicker plates produced global dishing. The bulge peak also grew earlier and more quickly in thinner specimens. The greater ductility of copper resulted in narrower, faster-growing bulges compared with mild steel of comparable thickness.
Bibliography:	ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23
ISSN:	0734-743X 1879-3509
DOI:	10.1016/j.ijimpeng.2011.06.007