Shuffling phase in composite optimisation of a formula student monocoque
Altair EmployeeHi,
I am currently trying to do composite optimisation of a carbon fibre sandwich structure monocoque. I have been following the 'composite optimisation of a formula student monocoque' tutorial on the Altair university training website and am up to the shuffling stage however am not getting any results and getting this message:
*** WARNING # 1569
for element id = -70001.
Thickness is zero for this composite. This will produce meaningless stress
results and may cause singularity of the global stiffness matrix.
*** WARNING # 1569
for element id = -70002.
Thickness is zero for this composite. This will produce meaningless stress
results and may cause singularity of the global stiffness matrix.
*** WARNING # 1569
for element id = -70003.
Thickness is zero for this composite. This will produce meaningless stress
results and may cause singularity of the global stiffness matrix.
*** WARNING # 1569
for element id = -70004.
Thickness is zero for this composite. This will produce meaningless stress
results and may cause singularity of the global stiffness matrix.
*** WARNING # 1569
for element id = -70005.
Thickness is zero for this composite. This will produce meaningless stress
results and may cause singularity of the global stiffness matrix.
*** WARNING # 1569
for element id = -70006.
Thickness is zero for this composite. This will produce meaningless stress
results and may cause singularity of the global stiffness matrix.
*** WARNING # 1569
for element id = -70007.
Thickness is zero for this composite. This will produce meaningless stress
results and may cause singularity of the global stiffness matrix.
*** WARNING # 1569
for element id = -70008.
Thickness is zero for this composite. This will produce meaningless stress
results and may cause singularity of the global stiffness matrix.
*** WARNING # 1569
for element id = -70009.
Thickness is zero for this composite. This will produce meaningless stress
results and may cause singularity of the global stiffness matrix.
*** WARNING # 1569
for element id = -70010.
Thickness is zero for this composite. This will produce meaningless stress
results and may cause singularity of the global stiffness matrix.
*** More of WARNING messages # 1569 were suppressed...
thanks in advance for any advice.
Toby
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thanks for your reply, the only other warning/error I'm getting is this:
*** WARNING 1932: PROD ID 11 is not referenced.
Any ideas?
On another note, going back to the free sizing phase - the optimisation doesnt do anything if my laminate has plies any thinner than 2mm thickness resulting in a much heavier chassis than the one I'm trying to optimise even after free sizing. IS there away round this?
Thanks
You can ignore this warning message, the lack of results may be due to a different modelling problem.