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Apparatus for Measuring the Dynamic Mechanical Properties of Polymeric Materials between 4° and 300°K
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1962
Year
EngineeringDynamic Mechanical PropertiesMechanical EngineeringDynamic Mechanical BehaviorRheological MeasurementFree DecayVibrationsMechanicsPolymer ProcessingExperimental MechanicRheologyPolymer CompositesMaterials ScienceMaterial MechanicsPolymer AnalysisPolymeric MaterialsMechanical PropertiesMaterials CharacterizationPolymer SciencePolymer CharacterizationPolymer PropertyPolymer ModelingMechanics Of Materials
An apparatus to measure the dynamic mechanical behavior of polymeric materials from 4°K to room temperature and at frequencies in the mid-audio range is described. The specimen is driven in its fundamental longitudinal mode of vibration by a transducer which is coupled to the sample by a glass fiber. The lower end of the sample, which hangs vertically, is coated with a thin layer of iron filings. A small permanent magnet is rigidly supported close to and directly below the lower end of the specimen, and a pickup coil detects the motion of the latter. This apparatus uses either the free decay or bandwidth method of determining the internal friction Q−1 and values as low as 6×10−6 have been obtained. Measurements from 8° to 300°K for lead and from 20° to 130°K for polystyrene are reported.