Radioss Material M36 Plastic Tab

Altair Forum User

Hi,

 

Could anyone tell me if we use M36 Plastic tab there is a procedure given to represent tear or element deletion.

 I have certain queries 

1) Can I represent tear with M36 Plastic tab like that of  real scenario?

2) When stresses and strains are given has a input in the N func should they be [true stress vs true strain]        or       [Engineering stress vs Engineering Strain]?

3) I tried to generate tear, for this purpose I used Et = 1(strain in the pic) and Em = 1.25 (approximation) when such  a model was used I couldn't reach the maximum ultimate stress, tear occurred much earlier at 250 MPa. Whereas if I don't define Em and let it be a default then I achieved a maximum stress of 350 MPa. So is this procedure correct?

4) Where can I find the literature of Em (maximum failure strain where stress is zero)

 

 

 

 

thanking you,

 

 

yours sincerely,

kartik kanugo

Altair Forum User

Hi Kartik,

1).Yes, you can represent /MAT/LAW36 to represent tear like simulation.

2).The function should be true stress vs true strain.

3).When the material reaches the failure strain (εp_max) the corresponding elements will be deleted from the model. SO i recommend you to provide a higher value of Eps_max and simulate the tear effect. The other option is to use any failure card, like /FAIL/JOHNSON.

4).If the largest principal strain reaches εm value, the stress in the element is reduced to 0, but the element is not deleted.

Altair Forum User

Hi,

 

I would like to use MAT LAW36 for element type: SOLID/BRICK

Could anyone tell me, which property card should I use?

I would like to run it in Radioss v12.0.226.

In manual we can see, that type 14, 20 and 22 can be used.

I need to model tension test with LAW36 and I need proper property card.

Please help me with that topic.

 

Thanks in advance.

Jakub

Altair Forum User

Hi Jakub,

For solid elements you can use P14_SOLID property.

Altair Forum User

Hi George,

Do you mean that one?:

/PROP/TYPE14 - General Fluid Property Set

 

 

Altair Forum User

Hi Jakub,

Yes, in /PROP.TYPE14 we also have general solid property set. As default this property card will have solid property set.

 

Altair Forum User

Hi George,
Thank you very much for your fast response.