Hi all.
I made a test model like the LSTC for drilling with a smooth drill. I simulate drilling an SPG ram:
I want to carry out a fatigue analysis of the drill, but the stresses on the drill are constantly increasing even after the drill passes through the die (I think this is a singularity).
Due to the increase in stress, my SN curve has an error when fatigue analyzing:
The stresses increase even after the drill passes through the die:
I came up with the idea of removing singular elements during the solution using MAT ADD EROSION. I set the stress above which elements will be removed:
But when the task started, the elements began to deform immediately and the drill had not even touched the die:
Why is this happening? Can you help me? Thank you!
Help please
Is there any initial penetration or like unit missing. Also at the outermost of the drill, is there any boundary conditions. Moreover, could there be a problem in defining the angular velocity or initial condition given to the part?
@javat33489 seems like a problem with the material / section / hourglass of the drill. Or you could have something weird going on with your mesh or a contact involved with the drill?
Do you have initial stress or anything similar involved here?
@negativevolume Touching occurs during the calculation; initially there is no touching. At first the stress is 0. Perhaps my mesh is too rough for a drill, but that’s why I wanted to use MAT_EROSION to remove bad elements.
Maybe I specified few settings in the MAT_EROSION map? I only used SIGVM. Let me remind you that my goal is to remove elements exceeding a given stress value.
