An Improved Torsion Pendulum for Measuring Internal Damping

A new torsion pendulum for measuring internal damping of metals and alloys is described. Improvements over earlier apparatus of this type include (1) a more convenient specimen shape, (2) an electromechanical transducer to measure angular deflections, (3) automatic compensation for eccentric vibrati...

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Bibliographic Details
Published in:Review of scientific instruments 1969-11, Vol.40 (11), p.1450-1453
Main Authors: Schwaneke, A. E., Nash, R. W.
Format: Article
Language:English
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Summary:A new torsion pendulum for measuring internal damping of metals and alloys is described. Improvements over earlier apparatus of this type include (1) a more convenient specimen shape, (2) an electromechanical transducer to measure angular deflections, (3) automatic compensation for eccentric vibrations when operated in the bearingfree mode, and (4) a continuous range of over 500:1 in strain amplitudes with a signal‐to‐noise ratio of better than 2:1 at a strain of less than 6×10−6. Specific damping capacities ranging from 80% (log decrement, 0.81) to 0.01% (log decrement, 5×10−5) have been measured, and stresses as high as 1970 kg·cm−2 have been used.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.1683823