Browse Prior Art Database

Rebound Tester

IP.com Disclosure Number: IPCOM000094550D
Original Publication Date: 1965-Mar-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 27K

Publishing Venue

IBM

Related People

Klein, FJ: AUTHOR [+2]

Abstract

To test the dynamic modulus of a specimen the sample is mounted so that it is impacted by a test pendulum at the bottom of its arc. The pendulum carries a metal plate 10 at its free end. A distance detector circuit 12 and a proximity detector sense coil 14 are used. The relative position of coil 14 is adjusted so that plate 10 enters the sensitive range of coil 14 upon the pendulum striking the sample. The distance, of the pendulum from coil 14 is calibrated with the oscilloscope 16 so that the voltage of coil 14 is directly proportional to the distance between it and the pendulum.

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Rebound Tester

To test the dynamic modulus of a specimen the sample is mounted so that it is impacted by a test pendulum at the bottom of its arc. The pendulum carries a metal plate 10 at its free end. A distance detector circuit 12 and a proximity detector sense coil 14 are used. The relative position of coil 14 is adjusted so that plate 10 enters the sensitive range of coil 14 upon the pendulum striking the sample. The distance, of the pendulum from coil 14 is calibrated with the oscilloscope 16 so that the voltage of coil 14 is directly proportional to the distance between it and the pendulum.

In the test, the instantaneous deflection versus time is recorded on oscilloscope 16. The resilience is determined by the ratio of height of pendulum return divided by height from which pendulum drops. This is determined by the time between successive impacts.

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