However, a different pattern was observed in the stress relaxation test
of accelerated weathered coatings, which indicates the combined effect of photodegradation and structure relaxation, as exhibited in Fig.
The Temperature Scanning Stress Relaxation (TSSR) meter performs the anisothermal stress relaxation test
(AISR), a new test method that subjects a specimen to a constant tensile stress at a constantly rising temperature.
For the indentation stress relaxation test
, displacement is held constant (through feedback in a force-controlled system) and the gradual decrease in force is recorded.
Improvements to the EB 17 stress relaxation test
system are said to include better insulation for lower energy consumption, lower surface temperatures, a touch screen controlled PLC, count down timers for each cell, test name for each cell and alarm history.
The obtained if values for HDPE from the dynamic and the stress relaxation test
are very similar, which is consistent with the data from Larson [6).
The amount of force decay from t = 30 minutes to a desired time is generally measured in accordance with the compression stress relaxation test
, ISO 3384(A).
i], are constants of the generalized Maxwell model, they are determined by relaxation test
Schematic diagram for the relaxation test
is shown in Fig.
a]| strongly decreases with time in a relaxation test
, but this decay in the absolute value of negative stress is observed as an increase in[[sigma].
This experimental program involved three series of cyclic tests and a short-term relaxation test
conducted at room temperature.
51"] diameter, as in the compression stress relaxation test
The compression stress relaxation test
was performed on cylindrical shape specimens with 29 [+ or -] 0.