Friday 13 April 2012

What is the difference between a shell element and a 2D solid element?


The 2D Planar elements (For example : CPE4, CPE8 - plane strain analysis and CPS4,
CPS8 - plane stress analysis) are only used in situations where the loading is confined to
the plane of the elements. The elements only have planar variables (d.o.f) ux, uy.

Shell elements are needed for out-of-plane loading. Consider a square plate subjected to
a loading normal to the plane of the plate. This requires shell elements and use of plane
stress/plane strain type of elements would be inappropriate under these circumstances.



 
Shell elements can also be used where the loading is planar but the material is made of
composites. Since shell elements by definition allow for through thickness variation of
material properties these are the appropriate elements to be used in these cases.

** Example elements are from ABAQUS solver. 

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