stress relaxation
Technical term in physics and materials science: the decrease in stress in a material held at constant strain over time.
In polymer materials, stress relaxation is one of the important properties.
In this experiment, we measure stress relaxation after applying a constant strain.
クリープ (creep) is deformation under constant stress, while 応力緩和 is stress decrease under constant strain.
Compound of 応力 (stress) and 緩和 (relaxation). A direct translation of the English term 'stress relaxation'.