Learning Forum

[Ahmedkorya]

I am modeling ultra high performance concrete simple beam and i wrote the command file for solid 6t with stress strain curve and i faced probelm on failure criteria that the failure happen on tensile stress only and the solver stop on that can anyone please give me an advice how to make the solver go on the stress strain curve Untill compressive strength thanks in advance

[peteroznewman]

I don't know what you mean by "solid 6t".

When you say you used a "stress strain curve", which material model was that in, and did you model compressive stress-stain separately from tensile stress-strain?

What failure criteria are you using?

When bending a concrete beam, the failure always starts on the tensile side because concrete is so much weaker in tension than compression.

The solver might stop because the step size was too large.

Are you using a Force at the center or a Displacement to bend the beam?  If you use a Force, the solver will stop because there is no static equilibrium beyond the current solution. You have reached the ultimate strength.  If you use a Displacement, the solver can continue past the point of ultimate strength and plot the Force Displacement curve on the downward slope in the post-failure portion.

There are many discussions on this website that describe each of these suggestions. You will find them more easily if you use Google to search the site than the site search bar.

[Ahmedkorya]

Thanks for replying...i meant solid 65 and i wrote the compressive stress strain curve only and the parameters (max fcu-max tensile-coff of open and close shear)..i dont know how yo define failure criteria on ansys and i made a lot of supstep like 1000 step and the solver go on the end but when i check the stress on the bottom and upper face... i use displacement force face i see just tensile stress as i wrote on command file