We study the spatially uniform case of the quasistatic evolution in Cam-Clay plasticity, a relevant example of small strain nonassociative elasto- plasticity. Introducing a viscous approximation, the problem reduces to de- termine the limit behavior of the solutions of a singularly perturbed system of ODE’s in a finite dimensional Banach space. Depending on the sign of two explicit scalar indicators, we see that the limit dynamics presents, under quite generic assumptions, the alternation of three possible regimes: the elastic regime, when the limit equation is just the equation of linearized elasticity; the slow dynamics, when the stress evolves smoothly on the yield surface and plas- tic flow is produced; the fast dynamics, which may happen only in the softening regime, when viscous solutions exhibit a jump determined by the heteroclinic orbit of an auxiliary system. We give an iterative procedure to construct a viscous solution.
|Titolo:||Quasistatic evolution for Cam-Clay plasticity: the spatially homogeneous case|
|Autori:||DAL MASO G; SOLOMBRINO F|
|Rivista:||NETWORKS AND HETEROGENEOUS MEDIA|
|Data di pubblicazione:||2010|
|Digital Object Identifier (DOI):||10.3934/nhm.2010.5.97|
|Appare nelle tipologie:||1.1 Journal article|