Shakedown

In continuum mechanics, elastic shakedown behavior is one in which plastic deformation takes place during running in, while due to residual stresses or strain hardening the steady state is perfectly elastic.

Plastic shakedown behavior, in which the steady state is a closed elastic plastic loop, with no net accumulation of plastic deformation.

Ratcheting behavior is one, in which the steady state is an open elastic plastic loop, the material accumulates a net strain during each cycle.

Ratcheting check

Not needed for only primary loading that meets static loading requirements Needed for cyclic thermal loading plus primary loading with a mean.

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