Session Details

08:30
Contact, Fluid Structure Interaction and Variational Transfer
Patrick Zulian (Università della Svizzera Italiana), Maria Nestola (Università della Svizzera Italiana), Cyrill von Planta (Università della Svizzera Italiana), Rolf Krause (Università della Svizzera Italiana)

Kurzfassung:
We present a new and completely parallel approach for fluid-structure interaction, which includes also contact between the elastic structures. Our approach is inspired by the fictitious domain method and makes intensive use of variational transfer between the solid and the fluid and on the possibly contacting surfaces between solids. We present the discretization, the setup of the variational transfer, and efficient methods for the solution of the arising non-linear problems. We present 2D and 3D benchmarks, and a tricuspid heart valve.

08:50
Simulation of fibers in woven composites: a comparison between solid and beam models
Mathias Haverstreng (Leibniz Universität Hannover), Stephanie Andress (Leibniz Universität Hannover), Ajay Bangalore Harish (Leibniz Universität Hannover), Alfredo Gay Neto (University of São Paulo), Peter Wriggers (Leibniz Universität Hannover)

Kurzfassung:
Woven composites find numerous applications in engineering products. Their micromechanical behavior involves complex contact behavior between fibers/matrix, debonding etc and thus warrant micromechanical investigations. Such materials can be geometrically described using computationally intensive solids or reduced structural models like beams/shells etc. This work provides an objective comparison between the two approaches in order to compare pros/cons of each modeling hierarchy.

09:10
Mortar-based contact formulations for non-smooth geometries
Alexander Popp (Technical University of Munich), Philipp Farah (Technical University of Munich), Wolfgang A. Wall (Technical University of Munich)

Kurzfassung:
Finite deformation frictional contact is revisited with a special emphasis on non-smooth geometries such as corners and edges. Contact conditions are enforced separately for point-, line- and surface-contact by employing three different sets of Lagrange multipliers and a variationally consistent discretization approach based on mortar FE methods. In particular, no unphysical transition parameters are required, but all contact decisions are taken implicitly by the underlying solution scheme.

09:30
Numerical model for contact with adhesion based on Kalker's variational principle.
Mykola Tkachuk (National Technical University, Kharkiv Polytechnical Institute)

Kurzfassung:
Kalker variational principle allows to solve consistently unilateral contact problems in terms of the normal traction as the prime unknown variable. It is particularly useful for the development of boundary elements for Boussinesq problem in half-space approximation. This principle is extended to account for adhesion between solids. The contact pressure may take negative values governed by an adhesive work potential and surface separation energy. The latter is evaluated via level-set.

09:50
A symmetry preserving contact treatment in isogeometric analysis
Ján Kopačka (Institute of Thermomechanics, Czech Academy of Sciences), Dusan Gabriel (Institute of Thermomechanics, Czech Academy of Sciences), Radek Kolman (Institute of Thermomechanics, Czech Academy of Sciences), Jiří Plešek (Institute of Thermomechanics, Czech Academy of Sciences)

Kurzfassung:
In this contribution an isogeometric contact treatment by the penalty method is presented. The symmetry preserving formulation, also known as the two-half-pass formulation, is utilized together with the Gauss-point-to-segment discretization. A particular attention is payed to the contact detection, i. e. to the closest point projection of a point onto a NURBS patch. The problem of contact pressure post-processing is also presented in more detail.