Abstract
Small-amplitude oscillatory shear is a widely used method of determining the linear viscoelastic properties of materials. In the classical version of the technique, the material is subjected to a sinusoidal shear strain of amplitude γ0 and frequency ω, such that the shear strain as a function of time is
If the response is linear, i.e. if the strain amplitude is sufficiently small, the resulting shear stress will also be sinusoidal:
where δ is the phase angle or mechanical loss angle and σ0 is the stress amplitude. Furthermore, σ0 at a given frequency is proportional to γ0, again if the strain is sufficiently small that the response is linear.
Keywords
- Strain Amplitude
- Discrete Fourier Transform
- Dynamic Mechanical Analysis
- Strain Signal
- Fast Fourier Transform Algorithm
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© 1993 Springer Science+Business Media Dordrecht
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Nelson, B.I., Dealy, J.M. (1993). Dynamic Mechanical Analysis Using Complex Waveforms. In: Collyer, A.A. (eds) Techniques in Rheological Measurement. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-2114-9_7
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DOI: https://doi.org/10.1007/978-94-011-2114-9_7
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