Instrumented Impact Testing Using a Hopkinson Bar Apparatus
AIR FORCE MATERIALS LAB WRIGHT-PATTERSON AFB OH
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A technique for conducting instrumented Charpy impact tests using a Hopkinson bar is presented. Data for three grades of beryllium covering a range in impact velocities from 20 to 200 insec .5 to 5 mms are obtained in the form of load-deflection curves from which maximum load, maximum deflection, and total energy are obtained. Results show good agreement with data on identical materials obtained from an instrumented impact test at 54 insec 1.37 ms and from a standard Charpy impact machine at 135 insec 3.43 ms. The advantages and limitations of the Hopkinson bar apparatus are discussed.
- Metallurgy and Metallography
- Test Facilities, Equipment and Methods