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Global existence and blow-up phenomenon for a quasilinear viscoelastic equation with strong damping and source terms

100%

Di H. , Song Z.

tom Vol. 42, no. 2

119--155

Considered herein is the global existence and non-global existence of the initial-boundary value problem for a quasilinear viscoelastic equation with strong damping and source terms. Firstly, we introduce a family of potential wells and give the invariance of some sets, which are essential to derive the main results. Secondly, we establish the existence of global weak solutions under the low initial energy and critical initial energy by the combination of the Galerkin approximation and improved potential well method involving with t. Thirdly, we obtain the finite time blow-up result for certain solutions with the non-positive initial energy and positive initial energy, and then give the upper bound for the blow-up time T∗. Especially, the threshold result between global existence and non-global existence is given under some certain conditions. Finally, a lower bound for the life span T∗ is derived by the means of integro-differential inequality techniques.

Global existence and dynamic structure of solutions for damped wave equation involving the fractional Laplacian

67%

Bidi Y. , Beniani A. , Zennir K. , Himadan A.

tom Vol. 54, nr 1

245--258

We consider strong damped wave equation involving the fractional Laplacian with nonlinear source. The results of global solution under necessary conditions on the critical exponent are established. The existence is proved by using the Galerkin approximations combined with the potential well theory. Moreover, we showed new decay estimates of global solution.