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About beam element in abaqus and ansys

I am interested in using beam element to do a nonlinear static analysis (may need to a dynamic analysis in the future), but have trouble to understand some of the key features of beam element in abaqus or ansys. My goal is to find a beam element (preferably general beam section) with a defined stress resultant yield surface (e.g., P-M-M yield surface). If possible, could also account warping degree of freedom.

ABAQUS

I only see *beam general section, section=nonlinear general is able to define the stress resultant- displacement nonlinear curve (e.g., Axial-displacement, Moment-curvature, torque-twist angle), however, the assumption that these nonlinear responses are uncoupled is restrictive. It means the element doesn't take into account the possible axial-bending interaction (i.e., P-M-M yielding surface).

In addition, no warping DOF is considered in nonlinear general beam sections (B31OS, B31OSH, B32OS, B32OSH don't apply to nonlinear general beam section).

So is there any beam element in abaqus can take into account axial-bending interaction by defining P-M-M yielding surface (I may want to change it if necessary)? Not necessarily general beam section, any beam element that allows me to tweak a little bit of the axial-bending interaction would work.

Also, I am thinking to use UMAT or UEL to fulfill this goal if none is available. But UMAT can only defined through stress-strain level, right? Is it possible to tweak some stress resultant stuff? In addition, if I want to use UEL to define an element with the P-M-M yielding surface, can I call the existing beam element definition then I only need to update the material part when yielding occurs in the subroutine code?

ANSYS

Ansys also has a general beam section by defining the stress resultant - displacement behavior, but what is the yielding criterion for this beam section? Does it take into account axial-bending interaction? If so, can I change this yielding criterion?

 

 

Comments

Dear baltkobe

I am interested in using beam element in abaqus and define the stress resultant- displacement nonlinear curve ( Axial-displacement, Moment-curvature, torque-twist angle), could you please guid me , how i can define these curves for beam behaviour?

It's my e-mail adress:

Mostafa_borgheie@yahoo.com

Your reply would appreciated in advance.

Mustafa

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