Apparatus for measuring viscoelastic properties over ten decades: Refinements
| ISSN: |
1089-7623
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| Source: |
AIP Digital Archive
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| Topics: |
Physics
Electrical Engineering, Measurement and Control Technology
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| Notes: |
This paper describes refinements to an instrument for determining the viscoelastic properties of a solid material isothermally, with a single apparatus, over 10 decades of time and frequency. Torque is applied electromagnetically to a specimen fixed at one end. Specimen deformation is determined via a laser beam reflected from the other end upon a split diode detector. Phase resolution is improved by the use of a lock-in amplifier at high frequency and by the use of Lissajous figures to measure phase, allowing the study of materials of moderate loss (0.008≤ tan δ≤0.2) in addition to materials with high loss (tan δ≈1). The rigidity of the instrument is increased by modifications in the specimen support geometry. The range of equivalent frequency for torsion is from less than 10−6 Hz to more than 104 Hz. Digital methods are incorporated in the creep measurements and in the phase measurements. © 1995 American Institute of Physics.
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| Type of Medium: |
Electronic Resource
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| URL: |