simple stress/strain validation

[KenPob]

Hi,

I am a structural engineer, and I have recently began using the Abaqus as a finite element software. After numerous attempts and researching a lot of information, I have not been able to validate a simple test.

What I am trying to do is model a non-linear steel part in 3D (as a solid) and trying to validate the stress/strain curve I receive from the Abaqus to the one I have inputted into the material property. I used the elastic and plastic models in the Abaqus/CAE. In all honesty the numbers are not important me (i.e. which structural steel, it could be 60 ksi grade or whatever), but I just want to know how to model it correctly so that the stresses and strains match up. I have read several topics here, but none seem to help.

Does anyone have a very basic input file they could share that has a working non-linear structural steel material property that matches the Abaqus stress/strain to the theory/actual stress/strain.

This problem has me stumped and I have been stuck on something so seemingly simple for a while now.

Thank you for any help you may provide.

 

[IceBreakerSours]

As I mentioned a few posts back, my bet is on the material definition. Where did you get your material data? Check your units/values carefully. Read the section "Concrete damaged plasticity" carefully. Play with the examples in the manual with this material model, if you haven't done so already.

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[KenPob]

I want to thank you for your help, I used some of the information in your replies to MTohmeh as well, which was helpful.

Moving on to a column (which is not a unit cube), let's say that I have loaded this column in shear, how would I determine the failure load? Meaning, after applying a displacement, how would I get the output for the failure load, assuming I am still using the Concrete Damage Plasticity Model.

For the unit cube, I just examined the force vs displacement at the "Load Node" which is the node I applied the displacement to. However, for a column, you don't necessarily know the exact point, how would I extract that information. I will post a picture to show you the column setup I have. I am applying the displacement on the top part above the column but want to determine the failure load in the column.

Here is the link: Link

Not sure if I can post it this way but I will try:

 

[IceBreakerSours]

Sorry, I am no good at plasticity and I do not want to speculate. However, I'd recommend consulting the documentation (manuals entitled Analysis User's, Examples, Verification, Benchmarks) to understand every little keyword as best as possible.

Are you new to this forum? If so, please read these FAQ:

http://www.eng-tips.com/faqs.cfm?fid=376

http://www.eng-tips.com/faqs.cfm?fid=1083