“…The study of the stabilization of problem involving constructive viscoelastic damping has attached a lot of attention in recent years e.g. [1,3,4,2,9,10,13,14,15,19,20,21,25,26] for the case of the Kelvin-Voigt damping and [11,22,27] for the case of the locally distributed structural damping. Noting that the main difference between these two kinds of damping from a mathematical point of view is that the Kelvin-Voigt damping is an operator of the same order of the leading elastic term while the structural order is of the half of the order of the principal operator.…”