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Logo: Institut für Baumechanik und Numerische Mechanik/Leibniz Universität Hannover
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Logo: Institut für Baumechanik und Numerische Mechanik/Leibniz Universität Hannover
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Contact Mechanics

Thermo-mechanical analysis of tires in stationary rolling contact

Bild zum Projekt Thermo-mechanical analysis of tires in stationary rolling contact

Bearbeitung:

M.Sc. Robert Beyer, Prof. Dr.-Ing. Udo Nackenhorst

Förderung durch:

German Research foundation (DFG)

Kurzbeschreibung:

The optimization of tire designs towards less rolling resistance and higher durability is still a challenging task. In the recently finished project (Link to Anuwat Suwannachit 2012) a thermo-mechanical framework for the calculation of the energy dissipation in the bulk material of stationary rolling tires was developed.

 

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Computational techniques for the stochastic excitation of rolling tires from rough road surface contact

Bild zum Projekt Computational techniques for the stochastic excitation of rolling tires from rough road surface contact

Bearbeitung:

Robert Lee Gates, M.Sc.; Prof. Dr.-Ing. Udo Nackenhorst

Förderung durch:

DFG (German Research Foundation)

Kurzbeschreibung:

In this project, we intend to address issues in modeling rolling tires on rough road surfaces by (a) extending previously developed methods by a stochastic excitation function describing the interaction of the macroscopic tire model and the detailed meso-mechanical contact behavior of the tire tread with the road surface; (b) including dynamic stiffening effects in the rubber compound.

 

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Modeling and Simulation of Rolling Tires with Detailed Tread Pattern

Bild zum Projekt Modeling and Simulation of Rolling Tires with Detailed Tread Pattern

Bearbeitung:

M. Sc. Thirumalalagu Palanichamy, Prof. Dr.-Ing. Udo Nackenhorst

Kurzbeschreibung:

The analysis of tires is of importance in tire industries for determining wear phenomena, endurance and noise effects, etc. The relative kinematics framework based on ALE formulation has its main advantages in implementing the detailed contact analysis with local mesh refinement and time independent formulation of elastic stationary rolling. The weak point of the ALE formulation is that tires with detailed tread pattern cannot be simulated due to its axi symmetric constraint.

 

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Modeling and numerical simulation for the prediction of the fatigue strength of air springs

Bild zum Projekt Modeling and numerical simulation for the prediction of the fatigue strength of air springs

Bearbeitung:

M. Sc. Niraj Kumar Jha, Prof. Dr.-Ing. Udo Nackenhorst

Förderung durch:

Continental Teves AG

Kurzbeschreibung:

Fatigue failure of cord-reinforced rubber composite has been the subject of extensive studies in automotive industries due to its importance in engineering applications. The classical examples of such composites are found in tires, hoses, and airsprings.

 

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Numerical simulation of tire rolling noise radiation

 

Förderung durch:

Supported by BMBF

Kurzbeschreibung:

The structural dynamics of rolling tires is treated by a modal superposition approach whereas the underlying stationary rolling process is modeled within a nonlinear relative kinematics continuum theory.

 

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Finite Element Evaluation of Primary Stability of Teeth Implants

Bild zum Projekt Finite Element Evaluation of Primary Stability of Teeth Implants

Kurzbeschreibung:

Usually dental implants are loaded after the healing period which is generally 2 to 3 months after the insertion of the implant. During the healing period the patient is dependent on liquid diet. Therefore implant technologies are heading towards implants that can be loaded directly after insertion. The aim of this project is to compare the primary stability of two dental implants, one standard model and one model with a bar for rotational stabilization.

 

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Numerical Treatment of Inelastic Constitutive Behaviour within an ALE-Framework of Rolling

Bild zum Projekt Numerical Treatment of Inelastic Constitutive Behaviour within an ALE-Framework of Rolling

Bearbeitung:

ext. M. Ziefle

Förderung durch:

This work is financed by the German Research Foundation (DFG).

Kurzbeschreibung:

The aim of this research project is the development of efficient computation methods for the treatment of inelastic material behaviour of rolling elastomer solids.

 

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A multi-scale approach on the transient dynamics of rolling tires

Bild zum Projekt A multi-scale approach on the transient dynamics of rolling tires

Bearbeitung:

Prof. Dr.-Ing. Udo Nackenhorst, M.Sc. Anuwat suwannachit

Förderung durch:

This work is supported by German Ministry for Economics within the “Leiser Straßenverkehr 2” program

Kurzbeschreibung:

The transient dynamic response of rolling tires, which is a major source of traffic noise nowadays, is excited from the tread impact and the road surface texture. A multi-scale approach is introduced in order to investigate the behaviour of tread rubber in contact with rough road surface at a sufficient small length-scale, which leads to the vibration of the overall structure.

 

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Transient dynamic impact of inelastic solids with rough surfaces

Bild zum Projekt Transient dynamic impact of inelastic solids with rough surfaces

Bearbeitung:

Prof. Dr.-Ing. Udo Nackenhorst, M.Sc. Anuwat Suwannachit

Förderung durch:

This work is supported by German Research Foundation (DFG)

Kurzbeschreibung:

Since more than two decades a relative kinematic framework (ALE-description) has been widely used for rolling contact analysis of tire-road systems. The well known advantages of the ALE-formulation are the possibility of local mesh refinement in contact region and time-independent formulation of stationary elastic rolling.

 

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ALE-interface coupling for multiscale analysis of treaded tires in rolling contact

Bild zum Projekt ALE-interface coupling for multiscale analysis of treaded tires in rolling contact

Bearbeitung:

Prof. Dr.-Ing. Udo Nackenhorst, Dip.-Ing. Raffaela Chiarello, Dipl. Ing. (FH) Ole Stegen

Kurzbeschreibung:

The Arbitrary Lagrangian Eulerian (ALE) formulation is well established for the finite element simulation of stationary as well as transient dynamics rolling contact phenomena. The method enables mesh refinements in the contact zone and a time independent formulation of stationary rolling. The inconvenience for the simulation of rolling tires is the incorrect treatment of the tread blocks due to the non axisymmetric geometry.

 

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Computational Methods for Frictional Rolling Contact

Bild zum Projekt Computational Methods for Frictional Rolling Contact

Bearbeitung:

ext. M. Ziefle

Förderung durch:

This work is financed by the German Research Foundation (DFG), research group FOR492.

Kurzbeschreibung:

The aim of this research project is the development of efficient computation methods for the analysis of frictional rolling contact problems of elastomer solids on rigid surfaces.

 

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Modeling of electro-mechanical contact on a mesoscopic length-scale

Bild zum Projekt Modeling of electro-mechanical contact on a mesoscopic length-scale

Bearbeitung:

ext. T. Helmich

Förderung durch:

This work is supported by the Graduiertenkolleg 615 of the DFG (German Research Foundation).

Kurzbeschreibung:

The aim of the project is a simulation of the electro-mechanical coupled contact behaviour between tip and surface of an afm.

 

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A finite element tire modelling approach for car interior noise simulation

 

Bearbeitung:

Prof. Dr.-Ing. Udo Nackenhorst, Dipl.-Ing Raffeala Chiarello

Kurzbeschreibung:

A finite element approach for the simulation of the dynamic behaviour of tires rolling on rough roads for the car indoor noise prediction is presented. Based on a detailed finite element model valid for the nonlinear stationary rolling analysis a modal tire model to be coupled with a total vehicle dynamics simulation approach has been developed, where special care is taken on the physical consistency.

 

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Multiscale Modeling, with Applications in Contact Mechanics

 

Bearbeitung:

Prof.Dr.-Ing. U. Nackenhorst, Dr.-Ing W. Shan

Förderung durch:

Deutsche Forschungsgemeinschaft (DFG), Graduiertenkolleg 614 (GRK615)

Kurzbeschreibung:

We seek for multi-scale methods with physically consistent coupling of the molecular dynamics (MD) method and the finite element methods (FEM), and apply it to contact problems. The material near the contact region will be modelled in MD models so that complicated behaviours such as dislocations, initiation of plastic deformations and crack propagation can be captured.

 

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Finite Element Analysis of the Fracture Healing Process

Bild zum Projekt Finite Element Analysis of the Fracture Healing Process

Bearbeitung:

Prof. Dr.-Ing. U. Nackenhorst, M.Sc. Alexander Sapotnick

Förderung durch:

This project is funded by the DFG (German Research Foundation) NA-330/8-1

 

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Finite Element Simulation of Osseointegration of Uncemented Endoprostheses

Bild zum Projekt Finite Element Simulation of Osseointegration of Uncemented Endoprostheses

Bearbeitung:

Prof. Dr.-Ing. U. Nackenhorst, M.Sc. André Lutz

Kurzbeschreibung:

The term osseointegration means the ingrowth of bone into a porous coated implant. In order to simulate the osseointegration of bone implants, a bio-active interface theory is necessary.

 

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An efficient approach for modeling hip joint contact

Bild zum Projekt An efficient approach for modeling hip joint contact

Bearbeitung:

M.Sc. Kristin Fietz, Prof. Dr.-Ing Undo Nackenhorst

Förderung durch:

This research is supported by the German Research Foundation under Grant NA 330/6-1.

Kurzbeschreibung:

In developed countries osteoarthritis is the major cause for artificial joint replacement. Unfortunately, the formation processes of this degeneration of cartilage and subchondral bone remain partly unknown. In this research project a three dimensional finite element model of the hip joint is developed in order to investigate the fluid cartilage contact under physiological loading conditions.

 

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Finite Element Analysis of Hip Joint Contact

Bild zum Projekt Finite Element Analysis of Hip Joint Contact

Bearbeitung:

Prof. Dr.-Ing. Udo Nackenhorst, M.Sc. Kristin Fietz, M.Sc. Andre Lutz

Kurzbeschreibung:

Diseases and injuries of the human muscosceletal system are of particular importance in the health care systems worldwide. The overall costs in Germany including loss of production are estimated up to 100 billion Euros every year.

 

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