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Rahul Raj

zero or negative volume : 3D element

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Guest

Hello,


 


I think it is a badly shaped 3D element.


The solid is decomposed into sub-volumes associated to each integration point.  If the element is badly warped, one sub-volume could be negative.


 


Check your element quality.


 


Regards,


Mario

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Hello  



Mario



Q.NGUYEN-DAI

thank you for your guidance.


I have checked as u both said, but the problem is that all is having 0% error. 


In our crash analysis we made the contact between two components by translating the nodes and equivalising them. We are not using bolt or weld joints. we meshed the axle by 2D AUTOMESH and wheel part( tyre+hub) by TETRAMESH. Is it a correct method???


 


Regards


Rahul Raj


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Hi


Sometime with soft material, solid elements can be deformed severely that its nodes go through opposite side and cause negative volume


Can handle by covering nul shell on them or set interior contact (i am not sure radioss has interior contact or not)


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Hi

tinh

thank you .... 

 

 We assumed the entire wheel assembly as a single entity and done 3 d meshing. Also we gave same material(rubber) for all the wheel assembly. As rubber is a soft material, we think that may be the reason for the error....

 

  

Regards

Rahul Raj

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As per my understanding,

 

assign failure criteria to that part where element is showing zero or negative volume.

sometimes because of load value it is getting deformed at high amount but not getting deleted even if load crosses its ultimate stress value.

 

correct me if i'm wrong.

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