Non-linear orthotropic material
Hi everyone,
I am modeling an additive manufacturing steel element and I have to define non-isotropic material (so an-isotropic or orthotopic), then I have to perform a non-linear analysis.
Is it possible to add the non linear behavior to orthotropic or an-isotropic material? As for isotropic material MAT1 I can use MATS1 and TABLES1.
Best regards
Martina
Answers
-
Yes it is possible to perform nonlinear analysis with orthotropic material. Till Optistruct 2017.1 we support small displacement analysis. Starting from OptiStruct 2017.2 we now support both small and large displacement analysis. PFA sample for deck for small and large displacement analysis. If possible use latest version 2018.
0 -
Thank you! I'll try.
Martina
0 -
The parameters of the material MAT8 should be set on the linear elastic behavior. Then the behavior after yielding is defined in the MATX43. Is it correct?
0 -
Please make sure to refer comments of MATX43.
0 -
Perfect, I found them in Help>HyperWorks Desktop.
Than you for the answers.
0 -
Hi Rahul,
what about PSOLID element? MAT8 is avaiable only for bi-dimensional element.
0 -
Please check below post for MAT9ORT with PCOMPLS.
https://community.altair.com/community?id=community_question&sys_id=c986c83a1b2bd0908017dc61ec4bcbbd0 -
Dear Rahul,
Thank you for the link!
I have CTETRA elements in my model, so I think I have to use MAT9ORT associated to PSOLID property. I do not have properties of each layer because my material has not proper layers. I have mechanical properties about the whole body obtained throughout tensile tests.
My doubt is if the directions 1, 2 and 3 along which I have to define mechanical properties in MAT9ORT (as elastic modulus, Poisson's ratio etc.) are about local reference system of each element, or are about the global reference system xyz. And I do not understand how can I check direction 1, 2 and 3 in my model.
Bests
Martina
0 -
-
Hi,
I model my sample using MAT9ORT Card Image for PSOLID elements. I activate the options for non-linear analysis MATX28 and select the TABLES1 for each direction, describing the non-linear behaviour. Results do not show the non-linear behaviour and maximum stresses exceed ultimate strength. I used the same procedure and tables I used for MAT1 (that works), but I do not have reasonable results. Please help me fixing my problem. I upload my model. If other files are needed I can upload them.
Best regards
Martina
0 -
Hello all,
was this issue resolved?
I think Martina was trying to set up a non-linear elasto-plastic and orthotropic material in Optistruct.
The file that Rahul posted is for NL larrge displacement analysis but not for elasto-plastic and orthotropic material behavior.
Is there a way to define elasto-plastic orthotropic material behavior for shells, like for istance it is done for isotropic materials using MATS card on MAT1?
Best regards,
Sig
0 -
Sigfrid said:
Hello all,
was this issue resolved?
I think Martina was trying to set up a non-linear elasto-plastic and orthotropic material in Optistruct.
The file that Rahul posted is for NL larrge displacement analysis but not for elasto-plastic and orthotropic material behavior.
Is there a way to define elasto-plastic orthotropic material behavior for shells, like for istance it is done for isotropic materials using MATS card on MAT1?
Best regards,
Sig
not yet, directly.
But for ortho and anisotropic, specially fiber materials, you could combine MultiScaleDesigner and OptiStruct, to get a even more accurate material model.
1 -
MartinaC said:
Hi,
I model my sample using MAT9ORT Card Image for PSOLID elements. I activate the options for non-linear analysis MATX28 and select the TABLES1 for each direction, describing the non-linear behaviour. Results do not show the non-linear behaviour and maximum stresses exceed ultimate strength. I used the same procedure and tables I used for MAT1 (that works), but I do not have reasonable results. Please help me fixing my problem. I upload my model. If other files are needed I can upload them.
Best regards
Martina
Hi Martina,
I do not know is this is still of relevance but according to the comments of MAT28X that you have defined in your model, it is only applicable for EXPDYN ANALYSIS - and not for NLSTAT.
If you found a solution to your task let me know.
Regards,
Sig
0 -
Adriano A. Koga_21884 said:
not yet, directly.
But for ortho and anisotropic, specially fiber materials, you could combine MultiScaleDesigner and OptiStruct, to get a even more accurate material model.
Hi Adriano,
is it possible to transfer the output of MSD for shell elements?
Does MSD deliver elasto-plastic material behavior?
Thanks for the quick response.
0
Altair Employee