Buckling Analysis Composites (PCOMPP)

Dear,

 

I am trying to preform a buckling analysis of a composite sandwich material.

But the Auto-SPC limits the DOF's of the composite skins, so that buckling can not happen in correct way.

 

When the Auto-SPC is dissabled, the solver gives the error which states that the DOF's of these elements should be limited, because they have no stiffness in that direction.

This is true, due to the material and property assignment (Mat 8, and PCOMPP) which does not provide stiffness in the 3th direction.

 

Is there a work around?
I also did a dynamic test (Radioss) where the specimen does not buckle according to the first mode.

Test to be replicated:

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Optistruct First mode

<?xml version="1.0" encoding="UTF-8"?>

 

Faulty result due to Auto SPC

<?xml version="1.0" encoding="UTF-8"?>

 

 

RADIOSS Result

 

<?xml version="1.0" encoding="UTF-8"?>

 

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