Energy loss exhibited by viscoelastic materials when they are subjected to loading and unloading cycles

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Energy loss during loading and unloading cycles in viscoelastic materials shows up as a hysteresis loop. When you plot stress against strain for a cycle, the loading path and the unloading path don’t coincide, forming a loop. The area inside that loop represents the energy dissipated as heat due to internal friction and the material’s viscous component. This damping behavior comes from the combination of elastic and viscous responses in viscoelastic materials, which causes time-dependent resistance during motion.

Creep is the gradual increase in strain under a constant applied stress, not the energy loss during a cycle. Relaxation is the decrease in stress under a constant strain, again a time-dependent response but not the cyclic energy dissipation described here. Strain is just the deformation itself, not the process that accounts for energy loss in cyclic loading. Therefore, the best fit is hysteresis.