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When defining the thickness of the shell elements, there is an option to define the Formulation "Thick" or "Thin". What's the meaning of this and how to determine which to use?
FAQID: 339
Applies to: All Products
Version: All Versions
Category: Element Types
Created: 11/04/2002
Last Revised: 11/04/2002
Discussion
Thick shell formulation considers shear terms that the thin shell formulation neglects. As a general guideline, use thick shells if the thickness-to-span ratio is larger that 5%.
To consider the difference between thick and thin shell formulation, let’s consider a cantilever beam, which can be modeled as a shell:
The actual deformation of the part is a combination of two types: a shear deformation and a bending deformation:
Depending on the thickness / span ratio, the shear deformation can become negligible compared to the bending deformation. This is the case if the ratio is inferior to 0.05 (that is 5%). This means that the span is 20 times larger that the thickness. Therefore the part is relatively thin. A shell formulation that doesn’t take into account the shear deformation (to save calculation time and efforts) was developed for cases of this type: it is the THIN SHELL FORMULATION.
For all other cases, that is when the shear deformation isn’t negligible compared to the bending deformation (which is the case for thicker shells), a formulation that takes into account the shear deformation must be used. It is called the THICK SHELL FORMULATION.
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