study of fatigue resistance in welding

[mambo1988]

I am a student of ing.mechanics, I am using multiphysics ansys for a university examination concerning the construction of a machine and I have come across the problem of fatigue study in welds.
I press that I am an amateur in using ansys, however we come to the point: I have to check the study of a welding made at the base of a c beam with a plate (then it will become frame). I read the norm 10011 (now in disuse) which compares the admissible sigma delta (according to the particular construction employed and the number of cycles), the norm is clear, the problem is to find the change of tensions within the welding cord, how can I proceed?? I have also given a peek at the Eurocode 1993-1-9 where we talk about the "hot-spot"... my question is: "How do I proceed to study the welding cord and verify the sigma delta or/e the "hot-spot"? do I have to model the welding cord on the base (already sized in the case of static load) and realize a bond between beams and plate? "

I hope I have made you understand the problem... thank you

 

[gerod]

If you have read the 1993-1-9 env you should also understand how to check the welding.
I do not use ansys for such checks (I do not have the license for fatigue verification) but use the formulas of 1993-1-9.
I don't know how ansys works in fatigue testing.
If you have a c beam with plate you are first to do it as with ansys, this is safe.
Hi.

 

[mambo1988]

If you have read the 1993-1-9 env you should also understand how to check the welding.
I do not use ansys for such checks (I do not have the license for fatigue verification) but use the formulas of 1993-1-9.
I don't know how ansys works in fatigue testing.
If you have a c beam with plate you are first to do it as with ansys, this is safe.
Hi.

I explain better, I have loads agents on the baricentro of my beam to c, and from here I calculated the most solicited point in the welding and compared with the adm voltage (static analysis) so I dimensioned the welding cord.... now I am analyzing the fatigue, knowing the number of cycles to which my machine must resist and the delta admissible sigma given by the norm, my problem is how to find the