Learning Forum

[DhruvP]

I am doing fatigue analysis of agitator nozzle of pressure vessel in ansys in which I have certain type of loads given in tabular data. i cant figure out how to apply these loads in order to get correct results in ansys workbench.

I have Axial force, Lateral force, Bending moment and Torque given in data with min, max, static, start and average values for each of these force and moments.

[danielshaw]

You cannot use the Mechanical Fatigue Tool (FT), because this type of loading would be non-constant, non-proportional loading which is not supported. You need to Time Step loading in Ansys nCode DesignLife.

[DhruvP]

Thank you for the guidance. however I have no experience in Time step analysis in Ansys nCode Design Life. Can you explain how it is done in Ansys or how should i approach this kind of problems ??

[peteroznewman]

Please explain how the values in the table should be applied. Are the Max and Min values supposed to be added to the Stat Value? The Average seems to be the average of the Max and Min values, so that seems to be a redundant piece of information. What is the point of the Start value? Is that ever returned to in the fatigue cycles.
It would be clear if you would create a table of values that describe one cycle.