Dear friends,
Currently im having two issues and uncertainties regarding on Abaqus analysis process:
i. Does Abaqus CAE has the capability to perform linear perturbation of Frequency and Modal analysis with the action of g= 9.81m/s^2 towards the whole model?
ii. How to apply load on a specific location, where the point does not appear in Abaqus? (as shown in attached figure) , Is there any solution to create a node on that location ?
Helps needed, best regards.
Hi Raimy, the effect of gravity on the natural frequency comes from the initial stress stiffening of the structure; in order to consider this effect you first must create a *STEP where you applied this gravity loading and solve the stress state (you must use the *NLGEOM option)... After this first step you add the natural frequency extraction step as usual.
Regarding question ii, there is way to create a fixed point in Abaqus CAE in order to instruct the mesher to add a node at this location, unfortunately I don't remember how this is perfomed, but I'm sure it is possible.
Good Luck!
Thank you C.Martin for your reply.
The *STEP you mentioned above is refer to STATIC,GENERAL ?
Best regards.
Yes, It should be a *STATIC, GENERAL with *NLGEOM option activated.
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