You are here
Elastic failure criterion
Dear all,
I would like to define an elastic material with a
failure value of maximum tensile strain only. Any element reaches a max.
tensile strain value will crack and suffer complete loss of load
carrying capacity(possibly delete that element). Thus its a change in
geometry that is only considered when redistributing stresses.
Could this be done in ABAQUS or any other Finite Element Software?...I have been working with ABAQUS for some time now but I could not reach any where
Thanks for the help
Hussam
Forums:
CZM
You can try cohesive element in ABAQUS.
It can be done with user subroutines
Hi Hussam,
I am not much familiar with scripting in Abaqus, but it can be done easily with user subroutines (APDL) in Ansys, as we have done in this paper: http://www.doaj.org/doaj?func=abstract&id=492835. The details of the program are not given in the paper, but if you are interested, I can send you the code (please give me few days time to locate the code, and provide some comments for better readability).
I assume that it should be possible in Abaqus also. May be some expert users of Abaqus can give suggestions.
Regards,
Jayadeep
Thank you Jayadeep
Thank you very much for the interesting paper. It would be really great to have the script for the program used.
Do you mind communicating by email? Mine is husam_n84@hotmail.com
Thanks very much again
Hussam
A quick question
So when the elemnt fails, you mentioned in the paper that you gave it an elasticity value of nearly zero? why not exactly zero or maybe negative value? Is it a solution convergence matter?I ask because I see the stress-strain curve you feed for concrete has a descending branch and I wonder how you modeled that.
Thanks
Hussam
Re: A quick question
Hi,
We used element "kill" option in ANSYS, which effectively makes "elasticity value nearly zero"; we didn't do it manually. Probably you are right; if Young's modulus is made exactly zero (or even extremely small), we will have convergence issues due to ill-conditioning.
The stress-strain curve of concrete given in the paper is the actual material model from a reference. As far as I remember, ANSYS does not allow a "descending branch" for stress-strain curve. So the curve was truncated at the maximum stress point. It does not make any difference as the compressive strains never become that high. Anyway, it is a very good observation from your side.
Regards,
Jayadeep
P.S.: I will send the script to your mail ID (within a few days).
Thank you
Thank you very much for your help and I will be waiting for your code
Regards
Hussam