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Creep is an inelastic time-dependent deformation which occurs when a material is subjected to stress at sufficiently high temperature, say 40% of the melting point or more.

Experimental creep data (using constant stress and temperature) often display three different types of behavior for the creep strain rate as function of time:

• In the initial primary creep regime the creep strain rate decreases with time.
• In the secondary creep regime the creep strain rate is almost constant.
• In the final tertiary creep regime the creep strain increases with time until a failure occurs.

This model computes the stress history over a long time for a material that exhibits creep behavior. The model is taken from NAFEMS Understanding Non-Linear Finite Analysis Through Illustrative Benchmarks. The displacement and stress levels are compared with the values given in the reference.