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strain scaling

strain scaling

strain scaling

i'm studying the rubber SBR i can see some particularly rheological behavior like overshoot undershoot flexus and morevother but i want ask you what you think about this problem that i'm going to explain:
Strain scaling
i'm using the mooney rheometer (in this instrument a serrated disc is rotated in a sample fixed in a pressurized cavity, and then the shear rate is not uniformly distribuited)
i can see at different "shear rate" (i can modify the angular velocity of the rotor from 0,1 rpm to 10 rpm) that the first torque overshoot come at the same strain (~angular velocity*time) with the same material.
i hope that you have understand my observation.
What is the mechanism that justify this strange behavior,
polymer chain with characteristic  lenght?
if you have some idea or article to show me would be nice.

best regard

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