If creep is active, creep time is used for the limit. The model will cycle until the total problem time equals a specified value. The default limit is 0.00001, but this can be specified by the user as appropriate. The ratio of the maximum unbalanced force to the total applied forces in the model is small. Modeling continues to be performed until a limiting condition is met, including the following. In addition to cycling or stepping a specified number of timestep calculations, UDEC features a number of solve tool that enables the automatic detection of the steady-state solution for mechanical problems. In this way, the user can assess when equilibrium has been reached. ![]() For example, if the maximum unbalanced force is initially 1 MN and drops to approximately 100 N, then the model can be considered at equilibrium, within 0.01% of the initial maximum unbalanced force. Generally it is sufficient to say that the model is in equilibrium when the maximum unbalanced force is small compared to the total applied forces in the problem. For a numerical analysis, the out-of-balance force will never reach exactly zero. The UDEC calculation cycle repeats over-and-over until a steady-state solution has been achieved (i.e, the maximum nodal force vector or the maximum unbalanced force is zero).
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