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MEASURMENT OF THE DYNAMIC PROPERTIES OF DAMPING MATERILS | ||
| AL-TAQANI | ||
| Article 1, Volume 23, Issue 4, 2010, Pages 74-87 | ||
| Author | ||
| Kadhim H. Ghlaim | ||
| Abstract | ||
| Most elastomers used in damping treatments for structures are visco - elastic in response to dynamic strains. The stress - strain relation can be described by two properties , the stress - strain modulus and a loss factor. The values of these properties are required for conditions tension or compression when the damping treatment consists of an unconstrained layer and in shear for the sandwich layer type of construction. The different techniques of measurement using either a freely decaying vibration or a forced resonance motion are considered inadequate for materials with a high loss factor or with properties which are strain dependent. A resonance technique for determining the properties in compression is described in which the exciting force is varied whilst keeping the strain amplitude constant . A second apparatus is described for testing elastomers in shear using a forced vibration technique. Typical results obtained with both techniques are given with particular attention to the dependence on strain amplitudes. | ||
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