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Two novel mechanical techniques are described for reducing the magnitude of the inertial component of dynamic load/time records while maintaining a high specimen velocity response. One approach uses a load-line plastic absorber to inhibit the oscillation from establishing itself; the second uses precompressed wing absorbers to reduce selectively the amplitude of the load oscillations commonly associated with inertial energy transfer. Both systems independently generate load-time records in which the magnitude of the oscillations is greatly reduced without a significant change in vibration frequency. The load-line also reduces the magnitude of the initial tup load spike commonly associated with impact testing. The data indicate that the use of these absorbers does not introduce any extraneous effects in the dynamic load/time records and that maximum damping can be obtained by combining the two techniques. The elastic portion of the dynamic and static load/displacement data also shows a good correlation.
fractur, dynamic loading, three-point bend specimen, mechanical damping, drop tower, impact testing
Defence scientist, Defence Research Establishment Atlantic, Darthmouth, Nova Scotia
Defence scientist, Defence Research Establishment Pacific, FMO Victoria, British Columbia