Local methods

Local methods for fatigue calculation operate directly with more or less exact values of local loading in the critical place. Two ways can be found among them:

Local elastic stress analysis – only elastic stresses are evaluated even in low-cycle fatigue, where pronounced plasticity effects can be expected. The advantage of such solution lies in the ability to post-process the elastic FE-solution , which is much more handy, than the elastic-plastic solution and in the possibility to superpose loads from individual load channels.
Local elastic-plastic strain analysis – real elastic-plastic strain (or stress) state is processed. Necessity to involve plasticity effects in the FE-computation or in the fatigue calculation sets relatively unpleasant obstacle to any simple engineering use of these methods.

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