Learning Forum

[cesar.amaya]

Hi, I've been working on a analysis for a steam turbine to determine the deformation in the shaft end and associated stresses on the casing caused by steam properties and external loads, but I've been struggling to get a realistic result, specially because I am getting stresses around 2000 MPa with small deformations (around 5mm). Have anyone had some experience analyzing such equipment? I don't know if I am mistaken on the boundry conditions or if it is something meshing related. I will put below the steps I have done.

1. Started from steady-state thermal analysis.
2. Confirmed the materials properties for each component
3. Meshing was done considering the following details:

1. Applied temperature for all internal faces of the turbine
2. Considered perfect insulation to external faces of the casing
3. Solved and then coupled with structural analysis
4. Check contacts with contact tools to verify open points.
5. Fixed contraint for support and frictionless to the other.
6. Applied internal pressure to all internal faces.
7. Applied external loads to inlet and exhaust nozzles.

Thanks, and looking foward for any prompt advise.

[peteroznewman]

The sheet metal leg where the high stress seems to be located at the fixed foot of the part,
is that a solid body meshed with solid elements?

If so, replace that solid body with a midsurface sheet body and mesh with shell elements.