zero or negative volume : 3D element
Altair EmployeeAnswers
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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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Tool => check elems => 3D => aspect, jacobian, warpage, tet collapse
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Hello
Mario&
Q.NGUYEN-DAIthank 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
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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You could change the element formulations with some advanced formulations (e.g. QEPH etc.).
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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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