The following mini-symposia will be organised within the conference programme:
| Title: | Constitutive modelling for flexible slender structures |
| Code: | MS-1 |
| Organisers: | Olivier Brüls, University of Liège Vanessa Dörlich, Fraunhofer ITWM Kaiserslautern |
| Abstract: | This mini-symposium addresses the development of constitutive models able to capture the mechanical behaviour of complex slender structures, such as multi-filament cables, multi-wired harnesses or composite slender structures. In order to capture the diverse internal phenomena occurring within the cross-section, the elaboration and validation of constitutive models may rely on experimental measurements and/or on finer scale numerical simulation of the structural assembly. The following research topics will be covered: – Advanced constitutive models for beam and shell models including e.g. dissipation, plasticity, damage and hysteresis effects, – Experimental measurements of constitutive properties of flexible slender structures, – Mesoscopic simulation of multi-components structures, such as multi-wire cables, cable bundles wiring harnesses, , flexible flat cables, woven or non-woven textiles, etc. – Multiscale and homogenization methods, – Constitutive models for composite slender structures, – Data-driven constitutive models. The mini-symposium will represent an excellent opportunity to discuss fundamental scientific questions and recent progresses related with the development of advanced constitutive models for slender structures. |
| Title: | Contact and friction in mechanics of flexible slender structures |
| Code: | MS-2 |
| Organisers: | José Escalona, University of Seville Johannes Gerstmayr, University of Innsbruck Christoph Meier, Technical University of Munich Yury Vetyukov, Technical University of Vienna |
| Abstract: | The mini-symposium will focus on the latest research and developments in the field, including the behavior of rods under large deformation, computational contact models and high-performance computing methods. Rods may undergo contact and friction either with other rods or with the surrounding environment. The mini-symposium will include, but is not restricted to the following subtopics: – Modeling of rods undergoing large deformation, – Computational methods, – Regularization/discretization approaches for frictional contact mechanics, – High-performance computing (HPC) methods, – Arbitrary Lagrangian-Eulerian (ALE) methods, – Machine learning methods, – Modeling and simulation of cable-pulley mechanisms and ropeway systems, – All subtopics related to rods with contact and/or friction. The symposium will provide an excellent opportunity for researchers and engineers to share their latest research and developments and to learn from one another, as well as an opportunity for future collaborations. |
| Title: | Machine learning based geometrically consistent simulation methods |
| Code: | MS-3 |
| Organisers: | Sigrid Leyendecker, Friedrich-Alexander University of Erlangen-Nuremburg Sina Ober-Blöbaum, University of Paderborn Elena Celledoni, National Technical University of Norway, Trondheim Brynjulf Owren, National Technical University of Norway, Trondheim |
| Abstract: | The digitalization of slender structures strongly relies on efficient and robust simulation methods. Oftentimes, the underlying physical systems are just too complex or even (partly) not known, thus preventing real-time simulations. Therefore, data-based machine learning techniques play a crucial role for the digitalization of slender structures as they bear the potential to on the one hand discover and replace system models and on the other hand to enable efficient predictive simulations. Taking prior knowledge about characteristic physical aspects of the dynamics, in particular geometric properties such as symmetries, conservation laws, Hamiltonian, Lagrangian, or variational structure into account substantially improves qualitative aspects of data-driven models leading to more reliable and robust models in particularly for long term simulations. Furthermore, tools from numerical analysis and geometry can be used to construct more stable, robust end efficient learning approaches. This mini-symposium invites contributions on machine learning based simulation methods taking physical structures and geometry into account addressing, for example but not limited to, the following aspects – Learning Hamiltonian and Lagrangian systems – Learning systems on manifolds – Symmetries and equivariant networks – Stable and robust network architectures – Learning of controlled, multirate or coupled systems |
| Title: | Modelling beam-like layered structures with compliant interfaces |
| Code: | MS-4 |
| Organisers: | Leo Škec, University of Rijeka Giulio Alfano, Brunel University |
| Abstract: | Layered structures can be nowadays easily found in nature (e.g. blood vessels, plants and Earth’s crust) and essentially all areas of industry (e.g. electrical, automotive, aerospace and civil engineering). In particular, structures in which layers of dissimilar materials are combined in a single structural member are called composite structures. Different layers are typically connected by means of discrete shear connectors, adhesive, or both. However, the interface between the layers is often the weakest part of the structure and its failure (delamination) can have severe consequences for the structure. Hence, developing computational tools for design of layered structures and delamination has been a major research topic in the last 50 years. In this mini-symposium the latest advances in modelling beam-like layered structures, as well as their failure by delamination, will be presented. Novel finite-element formulations, interface models and analytical solutions, as well as experimental investigations are welcome. |
| Title: | Slender structures with highly deformable cross-sections: beyond Kirchhoff equations |
| Code: | MS-5 |
| Organisers: | Sébastien Neukirch, Sorbonne University & CNRS Claire Lestringant, Sorbonne University & CNRS Helen Le Clézio, ETH Zurich |
| Abstract: | In studies of thin structures, highly nonlinear geometry is generally accurately captured by 1D approaches that predict the kinematics of a center line. In particular, under the assumption of linear elastic deformation of the cross-sections, classical Kirchhoff equations accurately capture the mechanics of a wide range of flexible slender structures, even in the case of large rotations. In this symposium, we aim at challenging this classical approach by exploring problems involving thin structures undergoing complex nonlinear deformations in their cross-section. Examples range from ribbons to thin-walled beams, including beams with large incompatible pre-strains, beams with cross-sections having large elastic contrasts, and others. Modeling such structures entails accounting for deformable cross-sections, dealing with behavior in the finite strain regime and nonlinear constitutive relations. In this session we will cover in particular: – Theoretical development of non-classical rod and shell theory – Numerical implementation of novel rod and shell models – Dimension reduction techniques |
| Title: | Nonlinear Dynamics of Slender Structures |
| Code: | MS-6 |
| Organisers: | Yury Vetyukov, Technical University of Vienna Francesco Dal Corso, University of Trento Jakob Scheidl, Technical University of Vienna |
| Abstract: | The current technological innovations in the field of soft robotics, flexible locomotion devices, vibration mitigation and energy harvesting, and morphable systems have sparked a renewed interest in the nonlinear dynamic response of slender structures. This special session will focus on novel analytical and numerical methods for analyzing the transient behavior of nonlinear slender structures. General-purpose simulation software can be inefficient or even useless for systems with complicated material structure, moving contacts, material flow through the control volume, impacts and friction, etc. Problem-oriented simulation techniques are often necessary to solve specific practical problems, or they can be useful to investigate new effects and concepts. The following non-exhaustive list provides examples of various phenomena and approaches relevant to the Mini-Symposium: – Axially moving structures and Arbitrary Lagrangian-Eulerian kinematic description – Variable-length structures and configurational forces – Aeroelasticity and fluid-structure interaction – Dynamic instabilities and parametric resonances – Non-conservative systems – Vibrations of damaged structures – Non-smooth systems, contact problems with impacts and friction, transport problems – Asymptotic analysis methods – Computer algebra assisted development of simulation tools – Snapping mechanisms – Nonlinear metamaterials and metastructures Acknowledgement: Support from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme, Grant agreement No. ERC-ADG-2021-101052956-BEYOND is gratefully acknowledged. |
| Title: | Multiphysics coupled problems in slender structures |
| Code: | MS-7 |
| Organisers: | Prakhar Gupta, Indian Institute of Technology (IIT) Hyderabad |
| Abstract: | This symposium focuses on modeling and numerical implementation of multiphysics coupled problems in slender structures like rods and shells. The primary objective would be to understand how large deformations occur in these structures when interacting with external fields such as electric fields, magnetic fields etc., and vice versa. The mini-symposium invites contributions on the development of novel coupled theories, including analytical or numerical solutions, with a focus on, but not limited to, the following topics: – Piezoelectricity, ferroelectricity – Gradient effects in dielectric materials such as flexoelectricity – Magnetic effects – Thermal effects – Fluid-structure interactions – Chemomechanics – Instabilities in coupled problems This mini-symposium aims to bring together researchers and experts to explore the complexities and applications of multiphysics interactions in slender structures. |
| Title: | Textiles and other macroscopic structures, built of flexural 1D objects |
| Code: | MS-8 |
| Organisers: | Julia Orlik, Fraunhofer ITWM Kaiserslautern Damien Durville, Université Paris-Saclay |
| Abstract: | The mini-symposium focuses on the latest modeling and simulation approaches in the field of textiles. The symposium in particular covers the modeling of thin plates made of infinite thin cylinders in a periodic contact with each other, – Asymptotic homogenization and dimension reduction algorithms, – Topological and structural aspects, providing some instabilities and couplings in the effective 2D-plates and shells, – Influence on the textile permeability, – Influence of the curvature and pre-strain in yarns, – Interpolation and simulation tools for the following applications: o Draping and folding of textiles o 3D printing on textiles, pre-stretch o Fluid-structure interaction and permeability of textiles o Electro-light yarns and their integration. The mini-symposium invites researchers from applied mathematics, computational and experimental textile engineering, computer graphics and other fields interested in the related topics. |
| Title: | Advanced models and numerical formulations for the interaction of beams and the coupling of beams with solids |
| Code: | MS-9 |
| Organisers: | Simon Klarmann, RWTH Aachen Myung-Jin Choi, RWTH Aachen Ivo Steinbrecher, University of the Bundeswehr Munich |
| Abstract: | In the analysis of slender structures, beam models benefit from accurately capturing interactions with solid elements and managing contact between beam and solid or other beam elements. Applications of these interactions include the analysis of bridge structures, wind turbines, space structures, woven fabrics, and many more. In these examples, the deformability of the cross-section plays a significant role in obtaining realistic physical behavior of the beam itself, smooth transitions from beam to solid elements, or smooth contact pressure distribution in beam contact problems. This is particularly important when considering physical nonlinearities, which require a representation of three-dimensional stress and strain states. The mini-symposium aims to bring together researchers dealing with relevant numerical methods on – Consideration of the cross-sectional deformations – Beam elements with three-dimensional stress and strain states – Consideration of arbitrary cross-section shapes – Mixed-dimensional interaction between 1D beams and 3D solids o Coupling of beams and solids o Beam-to-solid contact – Non-linear material behavior/Large deformations – Mixed finite element formulations – Non-standard spatial discretization method, e.g., isogeometric analysis The mini-symposium will provide an opportunity to discuss and exchange ideas on various topics related to the field. |
| Title: | Industrial application of simulation methods for flexible slender structures and their challenges |
| Code: | MS-10 |
| Organisers: | Joachim Linn, Fraunhofer ITWM Kaiserslautern Fabio Schneider-Jung, Fraunhofer ITWM Kaiserslautern Johan Ljunglinde, Fraunhofer-Chalmers Centre Gothenburg Christoffer Cromvik, Industrial Path Solutions Sweden |
| Abstract: | For a simulation software in the context of structural mechanics, the expectations of industrial users differ significantly from those of academic users, for instance, regarding – the user interface in general, – the model setup and possible adjustments, – availability of parameters, – computational speed, – or analyzing/postprocess capabilities. Unfortunately, it can therefore happen that a simulation method is not used by industrial users, even though it would be well suited to the task. Therefore, this mini-symposium addresses the application of simulation methods to industrial problems, their related challenges, possible solutions and best practice examples. The contributions should preferably focus on industrial applications of non-linear rod and shell models but is not restricted to those. |