Abstract
We introduce novel hybrid discontinuous Galerkin methods for applications in solid mechanics. Different methods are introduced and numerically evaluated for several benchmark scenarios which show that our new approaches are more efficient and in many applications more robust than lowest order conforming finite elements. We consider different methods with discontinuous ansatz spaces in the cells with different concepts to achieve approximate continuity on cell interfaces. In one approach we select adaptively constraints on the faces. This corresponds to a weakly conforming finite element space defined by primal and dual face degrees of freedom. For the hybrid formulation, the element bubble degrees of freedom can be locally eliminated. Here we show robustness of the hybrid method in the nearly incompressible limit and for thin structures. Non-linear applications including contact, plasticity, and large strain elasticity show the flexibility of this discretization. Then, a locking-free incomplete interior penalty Galerkin (IIPG) variant of the discontinuous Galerkin (DG) method with reduced integration on the boundary terms is introduced. Based on the idea of this element formulation, a novel low-order hybrid DG method for geometrically non-linear problems is proposed which eliminates the locking effects. The drawback is the non-symmetric structure of the stiffness matrix. Next, the symmetric version of the aforementioned element formulation is presented based on a finite element technology with reduced integration and hourglass stabilization. Furthermore, the free (penalty) scalar parameter is transformed to a matrix form that is analytically obtained from the finite element technology. Finally, the IIPG method in combination with a cohesive zone model is applied to model failure at the interface.
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Acknowledgements
Financial support of this work, related to the projects “Hybrid discretizations for nonlinear and nonsmooth problems in solid mechanics” funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) - Project-ID 255721882 - SPP 1748 is gratefully acknowledged.
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Bayat, H.R., Krämer, J., Reese, S., Wieners, C., Wohlmuth, B., Wunderlich, L. (2022). Hybrid Discretizations in Solid Mechanics for Non-linear and Non-smooth Problems. In: Schröder, J., Wriggers, P. (eds) Non-standard Discretisation Methods in Solid Mechanics. Lecture Notes in Applied and Computational Mechanics, vol 98. Springer, Cham. https://doi.org/10.1007/978-3-030-92672-4_1
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