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Logo: Institut für Kontinuumsmechanik/Leibniz Universität Hannover
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Logo: Institut für Kontinuumsmechanik/Leibniz Universität Hannover
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Entwicklung verbesserter Methoden für das Virtuelle Design - Annäherung an die Realität

Project coordinators: Christian Weißenfels, Peter Wriggers

Nowadays new and innovative products and production processes are developed in virtual labs. Since new prototypes have not to be fabricated and tested in order to validate their improvement, developments in virtual labs are not only faster, but also less expensive.

Unfortunately, the creative potential in the virtual labs is restricted by commonly used software systems. The opportunity to model arbitrary complex processes with large movements and deformations are still big challenges and the current computational tools are not able to simulate such processes.

Limitation become obvious in modelling formative, subtractive or additive manufacturing processes, insertion or installation processes like pile penetration or ship collisions to address only a few.

Hence tool development for a realistic virtual design is mandatory to give engineers in practice the possibilities to create new products and production processes.

Overview current projects:

Virtuelles Design

Numerical Algorithms for Machining and Cutting Processes – Improvement of Accuracy and Efficiency

Bild zum Projekt Numerical Algorithms for Machining and Cutting Processes – Improvement of Accuracy and Efficiency

Bearbeitung:

M.Sc. Dengpeng Huang

Förderung durch:

China Scholarship Council (CSC)

Kurzbeschreibung:

Metal cutting is one of the most common machining processes in industrial production. Modeling of metal cutting has proved to be particularly complex due to the coupled physical phenomena, including high dynamic shear, fracture, contact, friction and heat-generation. Analytical modeling based on machining experiment has been investigated extensively, but it can only describe the material behavior qualitatively. With the advent of high-speed computer and related robust algorithms, numerical modeling becomes a useful approach to improve and clearly understand the machining processes. In the current work, the Optimal Transportation Meshfree (OTM) method is used to simulate the material removal process in metal cutting.

 

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A Novel Design Approach for Safety at Ship Collision

 

Bearbeitung:

M.Sc. Mohsin Ali Chaudry

 

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A 3D CAD/CAE integration using isogeometric symmetric Galerkin boundary element method

Bild zum Projekt A 3D CAD/CAE integration using isogeometric symmetric Galerkin boundary element method

Leitung:

X. Zhuang

Bearbeitung:

Binh H. Nguyen

Kurzbeschreibung:

A seamless communication of computer aided design (CAD) and computer aided engineering (CAE) has always been the ultimate goal in product lifecycle management. The forward in- tegration CAD/CAE, in which the simulation tasks are operated directly on CAD model, can be achieved by the isogeometric analysis (IGA) within the conventional finite element method (FEM). Despite of this successful implementation that covers many engineering aspects, the crucial challenge in this CAD/CAE integration is the incompatible geometric representation, namely the volumetric representation of CAE versus the boundary representation of CAD in three-dimensional problems.

 

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Topology optimization of nano piezo/flexoelectric structures for energy harvesting applications

Bild zum Projekt Topology optimization of nano piezo/flexoelectric structures for energy harvesting applications

Leitung:

X. Zhuang

Bearbeitung:

Nanthakumar Srivilliputtur Subbiah

Kurzbeschreibung:

Energy harvesters convert the ambient vibration into useful electrical energy. The energy harvesting ability of a structure is characterised by the energy conversion factor, which is the ratio of electrical energy and mechanical energy under external mechanical vibrations. The developments in nanotechnology has lead to the field of Nano Electro Mechanical Systems (NEMS). Nano scale energy harvesting devices with nano sized piezoelectric layers have also become a possibility, where the surface elastic and surface piezoelectric effects become dominant.

 

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Micro-structure Topology Optimization of Auxetic Materials

Bild zum Projekt Micro-structure Topology Optimization of Auxetic Materials

Leitung:

X. Zhuang

Bearbeitung:

Thanh Chuong Nguyen

Kurzbeschreibung:

Auxetic materials with negative Poisson’s ratio can lead to dramatic enhancements in mechanical properties of structures. Such materials are created by modifying periodic unit cells so that the micro-mechanical structure of the unit cells contain hinge-like features. One of the implication of auxetic materials is their resistance to fracture since the lateral expand of material close up potential cracks. Auxetic materials flow toward the point of applied force in the impact problem and result in increase of dense at the impact zone. This show the indentation properties of auxetic materials and are adopted for various needs in military, automotive industries.

 

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Design and Control of Additive Manufacturing Processes for Medical Silicone

 

Bearbeitung:

M.Sc. Philipp Hartmann

 

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High Performance Computing of Stereolithography Processes

 

Bearbeitung:

M.Sc. Sandeep Kumar

 

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Improved Frictional Models for Pile Installations

 

Bearbeitung:

M.Sc. Ajay Harish

 

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A 3D CAD/CAE integration using isogeometric symmetric Galerkin boundary element method