A vanishing viscosity approach to a rate-independent damage model
- Knees, Dorothee
- Rossi, Riccarda
- Zanini, Chiara
2010 Mathematics Subject Classification
- 35D40 74R05 74C05 35K86 49J40
- rate-independent damage evolution, vanishing viscosity method, arc-length reparameterization, time discretization
We analyze a rate-independent model for damage evolution in elastic bodies. The central quantities are a stored energy functional and a dissipation functional, which is assumed to be positively homogeneous of degree one. Since the energy is not simultaneously (strictly) convex in the damage variable and the displacements, solutions may have jumps as a function of time. The latter circumstance makes it necessary to recur to suitable notions of weak solution. However, the by-now classical concept of global energetic solution fails to describe accurately the behavior of the system at jumps. Hence, we consider rate-independent damage models as limits of systems driven by viscous, rate-dependent dissipation. We use a technique for taking the vanishing viscosity limit, which is based on arc-length reparameterization. In this way, in the limit we obtain a novel formulation for the rate-independent damage model, which highlights the interplay of viscous and rate-independent effects in the jump regime, and provides a better description of the energetic behavior of the system at jumps.
- Math. Models Methods Appl. Sci., 23 (2013) pp. 565--616.