| 摘要 |
A torsional oscillation device for testing plastics material having a first clamp for holding one end of a plastics test specimen and a second clamp for the opposite end of the specimen. The second clamp is rigidly connected to an oscillator unit suspended from means for applying tension to hold the test specimen in tension, whereby the specimen, the oscillator unit and the second clamp form a torsion pendulum. A temperature chamber surrounds the specimen and a device measures the duration of oscillations of the torsional oscillation of the torsion pendulum. The means for applying tension is connected to a converter which converts the longitudinal movements of the tensioner into correspondingly valued electrical signals which render an indication of alterations in length of the test specimen.
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