Abstract
This work presents a simple finite element implementation of a geometrically exact and fully nonlinear Kirchhoff–Love shell model. Thus, the kinematics are based on a deformation gradient written in terms of the first- and second-order derivatives of the displacements. The resulting finite element formulation provides \(C^1\)-continuity using a penalty approach, which penalizes the kinking at the edges of neighboring elements. This approach enables the application of well-known \(C^0\)-continuous interpolations for the displacements, which leads to a simple finite element formulation, where the only unknowns are the nodal displacements. On the basis of polyconvex strain energy functions, the numerical framework for the simulation of isotropic and anisotropic thin shells is presented. A consistent plane stress condition is incorporated at the constitutive level of the model. A triangular finite element, with a quadratic interpolation for the displacements and a one-point integration for the enforcement of the \(C^1\)-continuity at the element interfaces leads to a robust shell element. Due to the simple nature of the element, even complex geometries can be meshed easily, which include folded and branched shells. The reliability and flexibility of the element formulation is shown in a couple of numerical examples, including also time dependent boundary value problems. A plane reference configuration is assumed for the shell mid-surface, but initially curved shells can be accomplished if one regards the initial configuration as a stress-free deformed state from the plane position, as done in previous works.
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Therein the author introduced the double-cross product: \(.\)
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Acknowledgments
The first and third authors gratefully acknowledge support by the Deutsche Forschungsgemeinschaft in the Priority Program 1748 “Novel finite elements for anisotropic media at finite strain” under the Project “Reliable Simulation Techniques in Solid Mechanics, Development of Non-standard Discretization Methods, Mechanical and Mathematical Analysis” (SCHR 570/23-1). In addition to that the author P. M. Pimenta expresses his acknowledgement to the Alexander von Humboldt Foundation for the Georg Forster Award that made possible his stays at the Universities of Duisburg-Essen and Hannover in Germany in the triennium 2015–2017 as well as to the French and Brazilian Governments for the Chair CAPES-Sorbonne that made possible his stay at Sorbonne Universités during the year of 2016 on a leave from the University of São Paulo.
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Viebahn, N., Pimenta, P.M. & Schröder, J. A simple triangular finite element for nonlinear thin shells: statics, dynamics and anisotropy. Comput Mech 59, 281–297 (2017). https://doi.org/10.1007/s00466-016-1343-6
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DOI: https://doi.org/10.1007/s00466-016-1343-6