Large Amplitude Oscillatory Shear (LAOS) is a widely used easy-to-use method to characterize the nonlinear material response, providing much higher selectivity. In the LAOS test, a sample is excited with a simple sinusoidal large excursion. The response signal is not a simple sinusoidal signal with a correspondingly large excursion.
Figure: Lissajou's figure for an EPDM polymer
The measurement is made by a step change in angular velocity or shear rate.
The storage modulus (G`) measures the energy which is stored in the sample and which will be released after mechanical stress...
Comparable with the usual vulcameter test here the module and the viscosity via the time are being captured...
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