Mesh size in failure crash analysis
Mesh size in failure crash analysis
(OP)
Mesh size could be very important in crash analysis;
The most common mesh size: 5-15 mm is too coarse sometimes to obtain good correlation results:
Have you got past experience in terms of material law and modelization ?
The most common mesh size: 5-15 mm is too coarse sometimes to obtain good correlation results:
Have you got past experience in terms of material law and modelization ?





RE: Mesh size in failure crash analysis
RE: Mesh size in failure crash analysis
------------
See FAQ569-1083 for details on how to make best use of Eng-Tips.com
RE: Mesh size in failure crash analysis
1. thickness is important becoz you dont want to have 5mm elements with 4.0 thickness(violates the shell theory)
2 load case is important coz you dont want 8 mm element on the rear bumper if you are doing front-impact.
3. resources are important, they dictate your model and mesh size.
4. If you want to capture beads, crush-initiators and etc then the geometric details will dictate your mesh size.
And in crash-analysis "the-more-the-elements-the-better-the-result" is not necessarily true. Infact in some case it can hurt the prediction by softening the model a bit too much.
So to sum it up i would say, its experience which determines the right size for the right problem and i guess thats the reason why companies pay big bucks to crash analysts...
Ghouri
RE: Mesh size in failure crash analysis
In general, the fewer elements you have then the stiffer the overall model. The more elements you have then the better the representation of the model stiffness. If more elements hurts the prediction then my guess is that some other factor in the model is not represented properly and using fewer elements is a random 'fiddle factor'.
corus