English to Italian Tech/Engineering Patents Ballistic resistant articles comprising elongate bodies

Si tratta del brevetto Ballistic resistant articles comprising elongate bodies.
Nella detailed description del brevetto trovo queste frasi:
The time-temperature superposition is applied at a reference temperature of 190°C. To determine the modulus below 0.001 frequency (rad/s) stress relaxation experiments may be performed.
In the stress relaxation experiments, a single transient deformation (step strain) to the polymer melt at fixed temperature is applied and maintained on the sample and the time dependent decay of stress is recorded.

decadimento della sollecitazione dipendente dal tempo?? Non mi convince decadimento della sollecitazione...
Grazie mille.