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law for multi-usages

Altair Forum User

Hello !

I have a model in which a material could be submitted to compression and tension.

However, this material have different reaction for these different solicitations.

I wonder if a law which detect the kind of constraint and adapt the reaction exists ?

Thank you for your answer !

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Radioss

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Altair Forum User

Hi,

Can you please elaborate more on your project, that is the objective of your analysis.

Altair Forum User

I have an object and I want make different test on it (tensile test, compression test or flexion test).
I have constitutive law for compression and tension (law 44) which are different and I want only one law.
For example, if i shot on it, I wish that my new law use my compression law and my tensile law where that happen.

Altair Forum User

Hi,

What kind of material do you have (metal, plastic, foam …. )?

Altair Forum User

It's a bone.
But they are two kinds of material : a foam and an elasto-plastic

Altair Forum User

Hi,

For foam materials, you can use LAW38 or LAW70.. For elasto-plastic materials, you can use LAW66.

Please go through the Help Menu on these material cards.

Altair Forum User

Thank you for your answer !

This law does not seem to work for shell elements.
Do you have a law for that ?

Altair Forum User

Hi,

You can model with /MAT/LAW36, where fct_IDp is used to distinguish the behavior in tension and compression for materials.

Please go through the Help Menu on the same.

Altair Forum User

This law is great thank you !

But I don't understand how to define compression curves and tensile curves.

Must I define them together ?

Altair Forum User

Hi,

Yes, define the material behavior and call the function in fct_IDp.

Meanwhile, /MAT/LAW66 is compatible with shell elements also, which is an isotropic tension-compression elasto-plastic material law.This law can be defined for compression and tension.