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.

References

1.Shakedown of Elastic-Plastic Structures. Jan A.Konig,Elsevier,1987

2.Limit Analysis of Structures at Thermal Cycling,Gokhfeld,D.A and Cherniavsky,O.F 1980.

3.ASME,2001,Boiler and Pressure Vessel Code,American Society of Mechanical Engineers ,New York.

4.Bree,J.,1967,"Elastic-Plastic Behaviour of Thin-Tubes Subjected to Internal Pressure and Intermittent High-Heat Fluxes with Application to Fast-Nuclear Reactor Fuel Elements,"J.Strain Analysis,Vol.2(3),pp226-228.