Type 7 interfaces not working

JM Desrosiers

Hi, I got Type 7 interfaces between parts. 

- No initial penetration or intersection. 

But some parts are passing through other parts. And some are ok. Why? Here my setup for type 7. 

I tried Type 11 with the same parameters, but still the same problem.

I can share the model, but in a secured folder.

Thanks!

JM

JM Desrosiers

I want to precise that the parts that are passing through others are parts which have some nodes in a type 2 interface

ArthurJANNOT

Hello,

It's possible to share your model please?

My secure FileDrop : https://ftam1.altair.com/filedrop/ajannot@altair.com

Best regards,

Arthur JANNOT

 

JM Desrosiers

I finally got it. I created surfaces to wrap my solid parts (to use it for Type 2 interfaces) and I don't know why, but when I remove theses surfaces, it's working.

 

For exemple. Part A and Part B have these kind of 2D surfaces. When I remove one of them, it's working.

 

Thanks!

 

JM

Andy_20955

Hi,

Glad to know you got if figured out.  Yes the 2d shell elements on the solid elements could be the issue.  If they are defined with VOID materials and properties then it is important to define realistic material properties in /MAT/VOID and thickness in /PROP/VOID because without these the contact stiffness will not work correctly.  If another material and property is used then using realistic values is still needed. This is mentioned in the comments of /INTER/TYPE7.

"When using /PROP/VOID and /MAT/VOID, material properties and thickness for the VOID material must be entered; otherwise, the contact stiffness of the void elements will be zero. This is especially important if VOID shell elements share elements with solid elements as the stiffness of the shell elements is used in the contact calculation."

Unlike other explicit solvers, the 2D shell elements skinned over solid elements are not needed for tied TYPE2 contact or other contacts such as TYPE7. 

Thanks,

Andy  

 

Dhanasharee Jadhav_20562

Hi,

Please refer to this video to learn more about the type 7 interface.

https://altairuniversity.com/learning-library/vii_d_sliding-interface-type-7-in-radioss/

Regards,

Dhanasharee Jadhav

JM Desrosiers

Andy_20955 said:

Hi,

Glad to know you got if figured out.  Yes the 2d shell elements on the solid elements could be the issue.  If they are defined with VOID materials and properties then it is important to define realistic material properties in /MAT/VOID and thickness in /PROP/VOID because without these the contact stiffness will not work correctly.  If another material and property is used then using realistic values is still needed. This is mentioned in the comments of /INTER/TYPE7.

"When using /PROP/VOID and /MAT/VOID, material properties and thickness for the VOID material must be entered; otherwise, the contact stiffness of the void elements will be zero. This is especially important if VOID shell elements share elements with solid elements as the stiffness of the shell elements is used in the contact calculation."

Unlike other explicit solvers, the 2D shell elements skinned over solid elements are not needed for tied TYPE2 contact or other contacts such as TYPE7. 

Thanks,

Andy  

 

Thanks,

That was exactly my problem.

Thanks Andy!

JM

Rogerio Nakano_21179

JM Desrosiers said:

I finally got it. I created surfaces to wrap my solid parts (to use it for Type 2 interfaces) and I don't know why, but when I remove theses surfaces, it's working.

 

For exemple. Part A and Part B have these kind of 2D surfaces. When I remove one of them, it's working.

 

Thanks!

 

JM

if you created surface becaused needed shells for the contact master side,  it is not needed.

You can define /SURF from the solid element faces as well and use it for the /INTER/TYPE2 contact.

Regards