Time-Dependent Viscoelastic Behavior: Solid and Liquid Properties of "Silly Putty" Deborah Number [De]=t/T Relaxation time T is short [ T is long [24Time-Dependent Viscoelastic Behavior: Solid and Liquid Properties of "Silly Putty" T is short [< 1s] T is long [24 hours] Deborah Number [De] =  /  Relaxation time