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Adding Fatigue Interfaces
You can add one or more Fatigue interfaces to your model and each can contain a combination of subnodes for fatigue evaluation —
Stress Life
,
Strain Life
,
Stress Based
,
Strain Based
,
Energy Based
,
Cumulative Damage
, or
Harmonic Vibration
. The fatigue evaluation can be done on any geometrical dimension, from the domain level to the point level, even if the stress analysis is performed on a higher geometrical dimension.
In most cases, fatigue cracks do appear at the surface of the structure. Cracks that are initiated inside the volume usually only occur when two objects are in contact, so that there are significant compressive stresses at the surface. For the fatigue evaluation you can thus in most cases select boundaries instead of domains. This approach results in significant performance gains.
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The Fatigue Interface
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Theory for the Fatigue Interface
