Frattura ed Integrità Strutturale, 38,
Proceedings of the 11th International Conference on Multiaxial Fatigue and Fracture, Paper #00100-0098, 2016
M. Springer1, M. Nelhiebl2, H.E. Pettermann1
1Institute of Lightweight Design and Structural
TU Wien, Vienna, Austria
2KAI, Villach, Austria
Fatigue considerations often distinguish between fatigue crack nucleation and
fatigue crack propagation.
The current work presents a modeling approach utilizing one Fatigue Damage
Indicator to treat both in a unified way.
The approach is implemented within the framework of the Finite Element Method.
Multiaxial critical plane models with an extended damage accumulation are
employed as Fatigue Indicators. Locations of fatigue crack emergence are
predicted by these indicators and material degradation is utilized to model
local material failure.
The cyclic loading is continued on the now degraded structure and the next
location prone to material failure is identified and degradation modeled.
This way, fatigue crack propagation is represented by an evolving spatial zone
of material failure.
This propagating damage zone leads to a changing structural response of the
By recourse to the Fatigue Damage Indicator a correlation between the number of
applied load cycles and the changing structural behavior is established.
Finally, the proposed approach is exemplified by cyclic bending experiments in
the Low Cycle Fatigue regime.