How is Multi-FEAST different?

Compared to the other fatigue assessment software packages available on the market, Multi-FEAST© is based on a completely different philosophy.

The most popular commercial software packages are FE codes which plot fatigue damage on the surface of the FE models.

This way of addressing the problem is, of course, very simple for the structural engineers, because it allows numerical solutions to be visualized in the same way as the static solutions. The limitation of this approach is that it does not allow stress concentrations to be assessed accurately, unless the involved notches are quite blunt (which is rarely the case!).

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Multi-FEAST© is a post-processor which works by coupling the stress states/fields at the critical locations and the load history damaging the component being assessed. As to the stress analysis, according to the specific problem which has to be addressed, the relevant stress states/fields can be determined either from classical analytical solutions (for instance, by taking full advantage of either the beam theory or the classical equations suitable for describing stress fields in the vicinity of stress raisers) or from conventional static analyses carried out by using a commercial FE software. As to the load history instead, it can be defined either analytically (like, for instance, a simple sinusoidal loading path) or from the load signals gathered by using conventional transducers attached to the component surface (typically, strain gages). Finally, to estimate fatigue damage, the necessary material properties can be either determined by running appropriate experiments or estimated by using several ad hoc developed empirical rules.

To conclude, it is worth observing that, thanks to the features of the approach implemented in Multi-FEAST©, our fatigue design software can be used to design real components against fatigue independently of the complexity of the assessed load history – not only uniaxial, but also multiaxial fatigue situations.