Internal Friction in Engineering Materials

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Abstract
This paper is a report on some experiments conducted on the subject of internal friction or damping in solid engineering materials, with apparatus and technique comparatively new to the field. The use of this equipment and technique enabled the measurement of internal friction in a more direct way than most if not all of the methods used by previous investigators. In the light of the results reported, empirical relations are presented for the variation of internal friction with stress amplitude in the range of engineering stresses. These relations are compared with the findings of others.

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