THE BEHAVIOR OF METALS AT ELEVATED TEMPERATURES UNDER IMPACT WITH A BOUNCING BALL
BROWN UNIV PROVIDENCE RI
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This report describes an investigation into the behavior of metals under impact at elevated temperatures. In a series of tests, a hard spherical ball strikes the flat surface of a massive specimen, which in one instance was a commercially pure lead and in another an aluminum alloy. Tests were made at a number of temperatures at each of which the velocity of impact and the velocity of rebound were measured, as well as the size of the permanent indentation in the specimen surface, and the time of contact between ball and specimen. Through dimensional analysis, relations were derived which predict quite accurately the time of contact and the diameter of the permanent indentation for a given material. Present results indicate a possibility that impact tests can be used to measure the dynamic yield stress, but a more complete investigation of this question is reserved for a later report.
- Metallurgy and Metallography