Trouble with Bending Test

Altair Forum User

Hi all,

 

i am simulating a three point bending test of a flat sheet sample (two rolls for support and a sharp edged stamp).

 

<?xml version="1.0" encoding="UTF-8"?>

 

For contact between stamp and specimen i use /INTER/TYPE7 with constant GAP=0.09 with both Parts being master and slave at the same time.

 

However i discovered, that i get penetrations through the contact gap by up to 60%, see pictures (Detail_02 is enlarged with factor 10):

 

<?xml version="1.0" encoding="UTF-8"?>

<?xml version="1.0" encoding="UTF-8"?>

 

It seems, that only on the nodes locations of the stamp part the gap is kept, between those nodes there is penetration. Why is this happening? The gap should be kept also between the stamp parts nodes, because there is a master segment on the stamp surface and a slave node on the sheet part...

Altair Forum User

Hi florian.

I cannot help you about why this is happening but i think that if you add adaptive meshing in your model, they will go away.

When using adaptive meshing in interfaces, the penetration is checked by RADIOSS and if found bigger than a user specified

percentage, the element is subdivided.

If you have troubling setting it up just ask.