Abstract
AbstractA creep analysis capability, using a generalized viscoelastic model, is introduced to process the creep behaviour coupled with elastoplastic deformation. The formulation is based on the step‐by‐step time integration of the Kelvin‐Maxwell rheological model with non‐constant parameters.The concept of a rheological model is extended to the multiaxial stresses by the Prandtl‐Reuss stress‐strain relationship, from which the tangential stiffness matrix is formed for Newton's iteration. If the plastic deformation is coupled with creep, the algorithm will seek a solution in two distinct steps. Various choices of empirical creep laws are available and small variations in temperature are allowed as implemented in the general purpose finite element analysis program.
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