HYPERVELOCITY IMPACT STUDIES
Final rept. 1 Feb-15 Oct 1965
TECHNICAL OPERATIONS INC BURLINGTON MA
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Two different problems related to hypervelocity impact were studied. The first involved the formation of a rippled surface produced at the interface of a stack of plates impacted by a projectile. The rippled structure was produced, as observed in cross section, as a sine wave, a sawtooth structure, and as oriented waves with a peaked crest. Some plates were welded permanently others separated as a result of failure in the base metal. A plausible explanation for the ring structure was found. The second problem involved the preparation and evaluation of homogeneous 1100-0, 7075-0, and 7075-T6 aluminum ingots for use as hypervelocity impact targets. An attempt was made to control grain size and to provide equiaxed grains. Tensile test data obtained in longitudinal and transverse specimens include yield and ultimate and true stress to fracture.