fluid pressure and metal plasticity
fluid pressure and metal plasticity
(OP)
hi to all again,my first question is how to define a fluid pressure and temperature acting on a piece of metal?is this possible in ABAQUS?and my second question is about the different plasticity models which one is to use and for what
thanks in forward
thanks in forward





RE: fluid pressure and metal plasticity
Do you have creep results?
Conventional insenstive to hydrostatic pressure model ,e.g , Tresca (or Mises) with isotropic hardening can be used if you only have Stress-Strain curve under static load
RE: fluid pressure and metal plasticity
RE: fluid pressure and metal plasticity
for the fluid modeling,no it is not a porous medium.i want to model a fluid pressure on a definied area of a piece of metal.any idea. thanks for the reply
RE: fluid pressure and metal plasticity
what material data do you have ?
For the fluid pressure: you can simulate it by applying hydrostatic pressure on the edge (surface) of the metal part this fluid pressure operating on.
RE: fluid pressure and metal plasticity
RE: fluid pressure and metal plasticity
Beaware that ABAQUS use true stress and longitudital strain. so you many need to convert them from the engineering stress and strain from test
RE: fluid pressure and metal plasticity
RE: fluid pressure and metal plasticity
You can use simple elasto-plsaticity model that is temperature-dependent
Get the young modulus from the stress strain curve.
If you notice the Curve, you find it at early loading stage linear. So get the slope of this linear part of the curve . That will be your Young modulus (E )if the stress- strain curve is for tension/compression and is Shear modulus (G) if shear test was performed. Assume Poission ratio for the material you have.
Enter the elastic information under Elasticity information
Go to plasticity and select Plastic . Choose isotropic hardening and tick at temperature-dependent data box
enter the first stress-plastic strain curve (taken at the first tempertaure)
enter the second curve for the second temperature
and so on
RE: fluid pressure and metal plasticity
RE: fluid pressure and metal plasticity
For stress strain curve ,do you have loading and unloading paths
If you do not have unloading path then this would be the only way to get elasticity modulus if you only have stress-strain curve data. Alternatively, You may want to get the approximate elasticity modulus looking for a similar material from literature.
"secondly the isotropic model for plasticity is not working": Keep the same model and just try to use the Step :Static Riks instead of Static General
and please let me know what happens.
RE: fluid pressure and metal plasticity
18.2.2 Models for metals subjected to cyclic loading.
and you will need to use the kinematic hardening modelling for cycling yielding.
In ABAQUS standard, the material only model up to the ultimate tensile strength, hence the loading that you see where it drop will not be modelled normally.
Beware that the plasticity will become perfetly plastic from the last of the plastic strain value specified.