Dynamic Stress Relaxometer

Dynamic stress relaxometer n. An instrument that measures the relaxation response of an elastomeric material to a prescribed shear deformation over a range of temperature. Basic elements of the instrument are a cone-shaped stator cavity and a conical rotor, both electrically heated. The sample is placed in the stator, which rises to a position to form a constant specimen thickness, forcing out the excess material. After heating to the desired temperature, the rotor is rotated quickly through a small angle, to a known shear deformation. The subsequent drop-off torque, which results from the relaxation of stress within the sample, is recorded over the time it takes for it to decay. 

Dynamic Stress Relaxometer n An instrument that measures the relaxation response of an elastomeric material to a prescribed shear deformation over a range of temperature. Basic elements of the instrument are a cone-shaped stator cavity and a conical... 

As a solution to the reproducibility problem, energy rather than time-based control was proposed [2-6]. For examining the reproducibility, the dynamic stress relaxometer was used [4]. This idea is called the unit work concept or energy-based control. A power integrator is used for the control. The energy-based control is also reported to be useful... 

The Dynamic Stress Relaxometer (DSR) also provides long time data and promises to be a tester for the same purpose [7]. The oscillating discs may be used if the frequency as low as 10 rad/s is available. These three tests conform with scientific requirements based on viscoelasticity [7, 8]. 

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