Set the compressive yield point?
Set the compressive yield point?
(OP)
I am new to abaqus and trying to run some very simple models. I have managed to run a plastic analysis with a tensile load, I am now interested in running an analysis with compressive yielding. I have tried setting the yield stress to -xxx (*Plastic -xxx,0) but get an error to say the yield stress must be greater than zero. How do you set the stress at which a material will deform in compression or is it assumed that the material yields at the same stress in both tension and compression?
Thanks
C
Thanks
C





RE: Set the compressive yield point?
MohrColoumb, Drucker Prager, Metal . It depends
RE: Set the compressive yield point?
RE: Set the compressive yield point?
If there is no details of the material data, using Ramberg-Osgood behavour is a good start.
I personally will not use perfectly plastic material behavior if I know the material will going to yield.
RE: Set the compressive yield point?
If for steel one just inputs stress strain data in tension, how is the data interpreted by ABAUQS in compression (for metals). Is the yield in compression assumed to be same as yield in tension? What is failure criterion for ductile metals in tension? Your reply to above questions will be appreciated.
Thanks,
Gurmeet
RE: Set the compressive yield point?
when doing cycling load such as a low-cycle fatigue situations. it is better to use Kinematic hardening material modelling, where the yield surface will shift.
RE: Set the compressive yield point?
Moreover, steel started to have noticeable non-linear behavior below its yeild (my gusses is appoximately 80% of yield strength)
Notice that, after the last stress strain data. ABAQUS assumed that it will be perfetly plastic afterward.
RE: Set the compressive yield point?
Sorry there was a mistake in my earlier post. My question was about failure criteria in comprssion not tension.
Thanks,
Gurmeet
RE: Set the compressive yield point?
RE: Set the compressive yield point?
just for your info that a material can have both isotropic (yield/loading surface is expand or contract in the same magnitude at all directions) and kinematic hardening (the yield surface being expanded is also translating in a specific direction) at the same time, although i do not thing that this case is applied to questionor's problem.
RE: Set the compressive yield point?