Learning Forum

[s.breyer]

Hi,

I tried different material models for a crimp simulation but as you can see in the picture, the crimp is too squashed on one side. It should look like the one on the right in the picture.

Material models I tried (also with extra high Young's Modulus):
Mat01_Elastic, Mat03_PlasticKinematic, Mat24_PiecewiseLinearPlasticity, Mat36_Barlat, Mat112_FiniteElasticStrainPlasticity.

They all give the same problem result.

[Raman Babu]

It seems like some different BCs, along with different material are used in your case

Can you share some pics of your simulation setup?

We utilize the following BCs to predict the deformed shape.

Regards,

Raman Babu

[s.breyer]

Hi,

here is a quick overview about my setup and one example of a material model (as I said i tried many different).

[Raman Babu]

Please specify the constraint to *MAT_rigid through CMO =1 for rigid parts

Also, you can specify the Die and tool as rigid. 

Loading condition:

Other conditions:

•Apply velocity to a tool body

•Displacement on the wires in the axial direction

•Rigid Body Constraint

-Anvil is fixed

-The tool is free in velocity direction but fixed otherwise

Please try to readjust your setup and let me know your findings.

[s.breyer]

 

Hi,

just to clarify, i am using the free student version

rigid body parts (thickness 0.05):

 

• light blue part (110111 – only move in Z)
• bottom die (111111 – no move)

 

wires – solid part (see material in the picture above):

 

• end of wires (111111 – the long end is fixed)

 

movement (only light blue part is moving to form the crimp)

i used z-displacement, so no “velocity”, just prescribed_motion_rigid DOF=3 & VAD=2

 

[s.breyer]

In the picture you can see the critical point. The punch makes pressure from above and the crimp becomes thinner. I still have no solution for this (im using LS-Dyna free student version)

[Raman Babu]

Can you please fix the wire & other deformable body only in the normal to wire axial direction in place of fixing it in all directions?

 

Regards,

Raman Babu

 

[s.breyer]

Hi,

i did and nothing changes at all. I still have problems with the volume constancy of the metal. The piece of metal should only roll inwards, but not be deformed in width.