why does penetration occur?

gslee

Hi,

 

I want to know the reason why penetration occurs.

auto1 :  Length (x-direction) = 1000, Height = 100(y-direction),  mesh size = 50

component1(yellow) : same as auto1.

 

When I make component1, I use 'translate -> duplicate-> y-direction -100'.

 

If I assign Property and Material on the components,  Penetrations occurs.

(If property and material are not assigned, penetrations does not occurs.)

 

Why does it happen??

 

Thanks.

 

 

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Simon Križnik

Hi,

 

the penetration is detected after assigning property with thickness value defined. This is due to the way the Minimum gap for impact activation (Gapmin) is computed if not specified.

 

 

If Gap_min=0 or blank, a default value is computed as:

If master segments are shell and solid elements, Gap_min = min ( tm , lmin2lmin2 ).

Where,

tm

The average thickness of the master shell elements, for I_gap=0

tm

The minimum thickness of the master shell elements, for I_gap=1, 2, or 3

lmin

The smallest side length of all master segments (shell or brick)

If master segments are all solid elements Gap_min = lmin10lmin10

Where, lmin being the smallest side of all master brick segments.

 

 

 

If no thickness is provided the penetration checker will fail to detect penetrations as tm is not available. This isn't a real issue anyway since the model will not be able to run without material and property properly defined.

 

For more details refer to the attached document from Radioss Help.
 

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