Wide-Temperature-Range Free-Layer Damping Materials
AIR FORCE MATERIALS LAB WRIGHT-PATTERSON AFB OH
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Techniques are described for extending and altering the temperature range over which viscoelastic materials are useful for free- ayer damping. The dynamic modulus and loss factor values of several vulcanized blends of mutually insoluble polymers containing selected amounts andor kinds of polymers, fillers, plasticizers, and curing agents were measured over temperature ranges including all of the apparent glass transitions of the polymers used in the blends. Several very effective formulations for free-layerdamping over wide temperature ranges were developed and the structural damping behavior of selected materials were investigated in simulated applications. The results show that polymer blends are versatile materials for wide-temperature- range free-layer damping treatments and can be formulated to meet specific needs of a particular vibration damping problem requiring free-layer damping.
- Elastomers and Rubber