Fatigue in Abaqus

[mba0188]

Hello everyone,

How could I estimate the fatigue life of a mechanical part under cyclic loading using Abaqus ? I don't have enough informations about fatigue under abaqus.

Thank you very much

 

[Rocketeer3k]

The simple answer: you cannot, at least in no simple manner.

It is possible with VCCT and it might be with xFEM. Search for "low-cycle fatigue" in the manual. In any case it would require some hard to get material parameters and in the case of VCCT prior knowledge of the crack path. Its no easy topic. If you have time and are serious, than check out the publications by Turon et al. They are researching a cohesive element based fatigue prediction. They have quite promising intermediate results. If you are good with user written subroutines, you can build your own fatigue-including cohesive element based on the works of Turon et al. But be warned, it takes plenty of computational resources and patience on your side. Its still an active field of research.

 

[mba0188]

Yes I searched for low cycle fatigue but as you said it requires parameters of damage evolution that must be introduced, I think we can predict life time if we do calculation on abaqus and make use of results to determine number of cycles by resorting Dang van or Basquin law. I will check out the publication by turon et al thank you.