FE analysis of steel bellows
FE analysis of steel bellows
(OP)
Hi,
I am analyzing steel bellows made of SS-304 stainless steel material subjected to axial displacement +/-12mm has to withstand 0.5 million cycles. Endurance strength of the material for infinite life is approx. 160 MPa. Stress from the linear static analysis for axial load is around 400 MPa.
My generic doubt is whether linear static model is adequate enough to represent the load-deflection characteristics of the bellows?
This is because the designer believes,stresses are over predicted from FE analysis.
If additional information is required in this regard, kindly let me know.
Logesh
I am analyzing steel bellows made of SS-304 stainless steel material subjected to axial displacement +/-12mm has to withstand 0.5 million cycles. Endurance strength of the material for infinite life is approx. 160 MPa. Stress from the linear static analysis for axial load is around 400 MPa.
My generic doubt is whether linear static model is adequate enough to represent the load-deflection characteristics of the bellows?
This is because the designer believes,stresses are over predicted from FE analysis.
If additional information is required in this regard, kindly let me know.
Logesh





RE: FE analysis of steel bellows
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RE: FE analysis of steel bellows
Bellows are supposed to absorb large axial and lateral displacements while still remaining within the elastic range of stress. You may have to consider a large displacement, small strain analysis that will require a non-linear code.
Andries
RE: FE analysis of steel bellows
Half a million cycles for a metal bellows does not sound right though. At a guess the nonlinear analysis will drop the bending stresses by about 30% still leaving you with 280 MPa to deal with.
I question the overall concept here, metal bellows are usually used for low number of cycle thermal applications.
gwolf.
RE: FE analysis of steel bellows
Post your model, or at least a jpeg of the mesh, and show/describe your boundary conditions.
RE: FE analysis of steel bellows
Thanks for your response.
The mesh model is included as an attachment.
I will be re-running the analysis with large deformation effects included and also will share the results.
The bellow needs to be analyzed for axial and bending loads.
For axial loads it needs to withstand half a million cycles, for bending loads it needs to withstand 50000 cycles.
Logesh.E
RE: FE analysis of steel bellows
Modelling the bending condition may be a little bit trickier, but a suitable moment condition at the boundaries of a single convolution ought to be do-able.
RE: FE analysis of steel bellows
corus
RE: FE analysis of steel bellows
Then all you need to do is find a post processor to look at the results! I think CAE might do it.
RE: FE analysis of steel bellows
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