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I know concrete is quasi brittle material, but using ductile damage properties in maximum stress zone and brittle damage properties in other zones may fix the problem. may be ABAQUS does not allow you to use both damage properties in one material, but it is an idea only. Please let me know about...

why you don't use ductile damage or something similar? did you test them? Regards, Mohammad Shahbazi http://www.omranafzar.com shahbazi@omranafzar.com

May be this help.. mdb.models['Model-1'].KinematicHardening(definition=REBAR, name='rebar-hardening', region=region, field='', distributionType=MAGNITUDE, numBackStress=1, rebarLayerNames=('rebar-layer1', ), equivPlasticStrain=(0.00035, ), backStress=((0.2, ), )) Regards, Mohammad Shahbazi...

I have seen the model already. I can not help you. Mohammad Shahbazi http://www.omranafzar.com shahbazi@omranafzar.com ---------------------------------- Please DO NOT respond to me directly but don't hesitate to post your response here so that all can share the information.

as the warning says you must specify "*preprint,model=yes", you can do that by selecting "Job>General>Print model definition data" in GUI. but actually it is not a serious problem.. Regards, Mohammad Shahbazi http://www.omranafzar.com shahbazi@omranafzar.com ----------------------------------...

I have made many comparisons like that between ABAQUS results and practical results, but have not seen more than 5% difference between them. there are many details must be noticed in modeling, I think there is something wrong in your modeling or material definition. Please leave your model here...

Leo, you have to define rebars and use *PRESTRESS parameter in it. if it is a new thread, please create a new one and attach your model to be considered.. Good Luck, Mohammad Shahbazi http://www.omranafzar.com shahbazi@omranafzar.com ---------------------------------- Please DO NOT respond to...

Francisco, I had a look at to your model, the result was nonlinear so I think you have to change the damage parameters to get the appropriate result. Mohammad Shahbazi http://www.omranafzar.com shahbazi@omranafzar.com ---------------------------------- Please DO NOT respond to me directly but...

I could not open the file please compress cae and jnl file in a zip file and attach it again. Good Luck, Mohammad Shahbazi www.OmranAfzar.com

I am agree with SWComposites, I think you should use a combination of elastic and plastic material properties. Regards, Mohammad Shahbazi www.OmranAfzar.com

and The attached file is loaded by 30 and converges. please check it out and let me know if you had anyother problems. Regards Mohammad Shahbazi www.OmranAfzar.comhttp://files.engineering.com/getfile.aspx?folder=71f1bd5f-a193-460f-bdcf-d187644a2dff&file=bm01-modified.zip

negative eigenvalue is not so important problem,it means that the buckle load is in the opposite direction to the reference load. Regards, Mohammad Shahbazi www.OmranAfzar.com

please leave your model for more considerations. Regards, Mohammad Shahbazi www.OmranAfzar.com

I am agree with vumat721 Mohammad Shahbazi www.OmranAfzar.com

Please leave your odb file here and tell me which nodes you want to select.. Regards, Mohammad Shahbazi www.OmranAfzar.com

Please attach your project, to be checked out. Regards, Mohammad Shahbazi www.OmranAfzar.com

williwang: I have an idea. we can work on a plugin to simplify material defining, reads its data from a database, it may be an engine only. and the data can be filled out by someone else (companies, laboratories..), it is a good job but time consuming. SWComposites: every material properties...

I'm agree with Gurmeet, the default meshing parameters are good enough. Good Luck, Mohammad Shahbazi www.OmranAfzar.com

how are you goning to do it? do you have any experience on python scripting? it can be a good job.. Good Luck, Mohammad Shahbazi www.OmranAfzar.com

some errors refers to your names you used, names like "PRESSÃO" causes the errors, please change them and try again. Regards, Mohammad Shahbazi www.OmranAfzar.com