Abstract
In these lecture notes, we describe basic features of the mixed/ enhanced four-node shell elements with six dofs/node based on the Hu-Washizu (HW) functional, developed for Green strain. The focus in on the following features:
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1.
Derivation of the so-called incomplete (partial) HW functionals for shells, with different treatment of the bending/twisting part and the transverse shear part of strain energy. This is an alternative to the derivation from the three-dimensional HW functional, and it allows to reduce the number of elemental parameters.
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2.
Selection of parameters of the assumed fields and selection of an enhancements for the HW shell elements, with the purpose to improve accuracy for distorted meshes. This includes also the use of the so-called skew coordinates, which are associated with the natural basis at the element center.
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3.
Numerical treatment of the drilling Rotation Constraint equation by the Perturbed Lagrange method. The faulty term resulting from the equal-order approximations of displacements and the drilling rotation is eliminated and one spurious mode is stabilized using the gamma method.
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4.
A simple additive/multiplicative scheme of treating finite rotations is described and tested on numerical examples. This simplified scheme is consistent with the typical update scheme used by FE codes.
The quality of the proposed formulation is demonstrated using the Hu-Washizu shell element with 29 parameters (HW29), which has a very good accuracy and is insensitive to the shape distortions for coarse meshes. Besides, it exhibits an excellent convergence and robustness in nonlinear examples.
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Notes
- 1.
- 2.
Note that the definition of Eq. (18) is not valid for the \( \mathbf {N}^* \) used here!
- 3.
The tilde denotes the skew-symmetric tensor associated with the rotation vector, i.e. \( \tilde{\varvec{\theta }} \doteq \varvec{\theta }\times \mathbf {I}\).
- 4.
The use of these programs is gratefully acknowledged.
- 5.
S16 is the 16-node shell element based on bi-cubic Lagrangian shape functions.
- 6.
2m is used in the circumferential direction.
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Wisniewski, K., Turska, E. (2017). Selected Topics on Mixed/Enhanced Four-Node Shell Elements with Drilling Rotation. In: Altenbach, H., Eremeyev, V. (eds) Shell-like Structures. CISM International Centre for Mechanical Sciences, vol 572. Springer, Cham. https://doi.org/10.1007/978-3-319-42277-0_6
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