On a doubly nonlinear model for the evolution of damaging in viscoelastic materials. (English) Zbl 1078.74048

Bonetti, Elena; Schimperna, Giulio; Segatti, Antonio

J. Differ. Equations 218, No. 1, 91-116 (2005).

Summary: We consider a model describing the evolution of damage in viscoelastic materials, where both the stiffness and the viscosity properties are assumed to degenerate as the damaging is complete. The equation of motion ruling the evolution of macroscopic displacement is hyperbolic. The evolution of the damage parameter is described by a doubly nonlinear parabolic variational inclusion, due to the presence of two maximal monotone graphs involving the phase parameter and its time derivative. Existence of a solution is proved in some subinterval of time in which the damage process is not complete. Uniqueness is established in the case when one of the two monotone graphs is assumed to be Lipschitz continuous.

MSC:

74R20	Anelastic fracture and damage
74H20	Existence of solutions of dynamical problems in solid mechanics
74H25	Uniqueness of solutions of dynamical problems in solid mechanics
35Q72	Other PDE from mechanics (MSC2000)

Keywords:

existence; uniqueness; parabolic variational inclusion

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