Nonlinear material-plasticity
Nonlinear material-plasticity
(OP)
I would like to know if defining more plasticity "points" (fy-ep) makes analysis more nonlinear and consequently more expensive.
For example:
If I put 4 rows instead of 20 in plasticity model, will my calculations be faster?
Thank you.
For example:
If I put 4 rows instead of 20 in plasticity model, will my calculations be faster?
Thank you.





RE: Nonlinear material-plasticity
"More" nonlinear? For a standard hardening model (isotropic?), no. Plasticity is in itself a "nonlinearity" and once defined forms part of a non-linear analysis (assuming the material goes beyond yield). Introducing "more" nonlinearity would involve defining contact or enabling non-linear geometry (NLGEOM), for example.
No. Why would it? By defining more points you are simply defining a better resolution of the plasticity behaviour of the material. Again, for a standard hardening model the analysis becomes more expensive if you choose a different constitutive model or you refine the time step control, or change the loading (amongst many, many other things depending on what it is you're doing).
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RE: Nonlinear material-plasticity
------------
See FAQ569-1083: Asking questions the smart way on Eng-Tips fora for details on how to make best use of Eng-Tips.com
RE: Nonlinear material-plasticity
The reason I tought that more points would mean more expensive analysis is that:
if I use only a few points I tought abaqus just makes the response linear between this two points (linear relationship stress-strain). Therefore, when applying next increment in nonlinear analysis, it is more likely that it will stay on the stress-strain curve and won't have to make iterations.
Sorry, if I am totaly wrong :)
Thank you again