  In this paper we consider a nonlinear Petrovsky equation in a bounded domain
with a delay term and a strong dissipation
  \begin{align*} u_{tt} + \Delta^{2} u -\mu_1g_1( \Delta( u_t(x,t))) -\mu_2g_2(
\Delta (u_t(x,t-\tau))) =0.
  \end{align*}
  We prove the existence of global solutions in suitable Sobolev spaces by
using the energy method combined with Faedo-Galarkin method under condition on
the weight of the delay term in the feedback and the weight of the term without
delay. Furthermore, we study general stability estimates by using some
properties of convex functions.
