Creep is a time-dependent deformation of solids at relatively low stresses,
leading to the breakdown with time. Here we propose a simple model for creep
failure of disordered solids, in which temperature and stress are controllable.
Despite its simplicity, this model can reproduce most experimental
observations. Time dependence of the strain rate is well fitted with power laws
resembling the Omori-Utsu and the inverse Omori laws in the primary and the
tertiary creep regimes, respectively. Distribution of the creep lifetime obeys
the log-normal distribution, and the average creep lifetime decays in a
scale-free manner with the increasing stress. The above results are in good
agreement with experiments. Additionally, the mean avalanche size as a function
of temperature exhibits a series of jumps, and finite-size scaling implies the
existence of phase transitions.Comment: 9 pages, 9 figure
