Learning Forum

[sna]

Hi!

I'm in the process of finding the plastic collapse load, define as "convergence is not achieved" (pr. API 17G)

I have applied a bearing load to my quater model (in the pad eye, fixed in bottom) and loaded to an arbitrary high load (2000kN)

I have an elastic-plastic material model

Under my soultions the deformation and stress both have yellow/red arrows indcating unconverged results? but my plastic strain appears with a green check-mark

What does it mean to have converged plastic strain but unconverged other results?

I also notice in tabular data for deformation at t=1s i do have a maxiumum value of 53.4mm, is this value valid? when the analysis is unvoverged at t=0.87s?

 

 

 

[peteroznewman]

When you get a message that the solution did not fully converge and you expected this due to applying a large force to a plasitc material, you will get some exponential curves leading up to the last converged substep, which in your case is 0.85 s.

I recommend you insert a Reaction Force probe for the Fixed Support so you can plot the applied force vs time.

That will allow you to make charts of other things on the y axis and applied force on the x axis.

On any output, you must set the time to 0.85 s then you will see converged data.

Plots at the unconverged time 1.0 s are not that useful.