Effect of localized plasticity
In: Notch effect
The localized plasticity induced by notches is a very unpleasant fact in the low-cycle fatigue. The Hooke's law between stress and strain is no longer valid and similarly the response of the local stresses to extern load is no more proportional. To enable the fatigue life computation, two concepts are introduced. The use of transient analysis is the first one.
The other concept, which is described here, compares the energy involved in the condition change if the local loading follows the Hooke's law and if the local loading conforms to some real elastic-plastic stress-strain law. There are two such methods implemented in PragTic:
Both methods were defined under assumption of uniaxial (or at least proportional) loading. If the loading is non-proportional or you would like to use some multiaxial method, use of these two methods have no sense. There is no generally recognized method like those two in the branch of multiaxial fatigue analysis.
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