Servicio de Información Comunitario sobre Investigación y Desarrollo - CORDIS

Development of a model to predict crack growth in the medium Delta-K range considering the effect of overload and spectrum loading

- Model able to predict the fatigue crack growth behaviour based only on a few basic material parameters (monotonic and cyclic mechanical properties and plastic zone size).

- Fatigue crack growth is predicted using a progressive damage accumulation model, which takes into account low cycle fatigue conditions ahead of the crack tip. A 3D elastoplastic FEA is used to calculate the strain distributions ahead of the crack tip area.

- The developed advanced model is able to address issues related to load interaction effects like the effect of overload and spectrum loading on fatigue crack growth behaviour. For the simulation of irregular service spectra by equivalent sequences of distinguished stress cycles a modified rainflow counting method is utilized.

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