EUROCONFERENCE ON HYPOPLASTICITY

26, 27, 28 February 1997 in INNSBRUCK, Tirol, Austria.


Developments and Perspectives of Hypoplasticity


EUROCONFERENCE

The announced Euroconference (to be followed by meetings in the years 1998 and 1999) aims to the mutual information of the individual researchers, to discuss and evaluate the several directions of development of constitutive laws for soils and other granular materials, to initialise and encourage further research and to instruct young researchers on the possibilities of hypoplasticity for numerical simulations and for furthergoing research.

The first two meetings are planned to take place in the workers union's guest-house at Innsbruck. This guest-house is situated in a mountain forest in a distance of only 5 km from Innsbruck down-town. The meetings will be kept as far as possible informal in order to guarantee a free exchange of opinions. The number of participants is limited to ca. 40. The last meeting will be given a larger publicity and participation and is conceived as a state-of-the-art presentation of our co-ordinated efforts and results to the scientific community. It is planned to take place in the Greek village of Horton (where several scientific and cultural meetings have already been successfully held).

The EU encourages the participation of the following groups:

  • researchers aged 35 years or under
  • researchers whose place of work is in a less-favoured EU-region
  • women researchers
  • researchers who work in industry

HYPOPLASTICITY

The mechanical behaviour of geomaterials and granular materials governs many problems not only in civil engineering (geotechnics, tunnelling, coastal engineering, off-shore constructions) but also in petroleum engineering and mining as well as in the chemical industry (silos and transportation equipment). In the 80s a new type of models to describe this behaviour has emerged from research at the Universities of Karlsruhe and Grenoble, mainly. The model originating from Karlsruhe has been given the name "Hypoplasticity” and bears intrinsic similarities to the Grenoble models. In the meanwhile, many scientists have improved the original model and investigated particular aspects.

The majority of mathematical models for geomaterials and other granular materials are formulated within the framework of the theory of plasticity. An alternative approach, which has been given the name hypoplasticity as it originates from hypoelasticity , has been formulated based on the principles of rational mechanics. Hypoplasticity lacks the several superstructure notions of the classical theory of plasticity (such as yield and bound surfaces, normality rule etc.). Instead, it represents the mathematical model as a single tensorial equation holding equally for loading and unloading. Its main advantages are simplicity and easy calibration. A series of works has been carried out referring to experimental corroboration, finite-element applications, prediction of localisation, extensions for viscous and Cosserat-materials, implications on controllability and stability of tests, cyclic phenomena, wave propagation and hidden relations to classical elastoplasticity.

LECTURES

Kolymbas: General principles for constitutive laws

Kolymbas: Introduction to hypoplasticity

Gudehus: State limits, attractors and percolation thresholds of granular materials

Gudehus: Extended hypoplasticity for aggregates with submicroscopic grains

Bauer: Hypoplastic representation of the physical properties

Herle: Numerical simulation of element tests

Herle: Determination of the material constants based on granulometry

Wu: Characteristic surfaces in the stress space

Wu: Bifurcation in hypoplasticity

Nader: Comparison of Cam-clay theory and hypoplasticity

Chambon: General features of CLoE models

Desrues: Prediction of localisation with CLoE models. The interface Daphnis for postlocalisation behaviour

NN: Micro CLoE and CLoE-Rock

Niemunis: Rate-dependence

Herle: Models for cyclic behaviour

Ossinov: Waves and bifurcation in hypoplastic media

The first session will be devoted to a general introduction devoted to the young participants. The last session will be devoted to the discussion of the perspectives and the future developments of hypoplasticity. The next meeting (in 1998) will be devoted to the numerical applications of hypoplasticity.

ACCOMMODATION

The accomodation in the workers union's guest house in Innsbruck from 25.02.97 evening to 28.02.97 evening including breakfast, lunch and dinner costs ATS 1.620.-

PARTICIPATION FEES

The participition fees amounts ATS 1.000.-. The fees must be transferred after acceptance of participation.

SUPPORT GRANTS

Owing to the status of a EUROCONFERENCE funded by the European Commission (TMR-Programme) we can envisage to reimbourse a large part of travel and accommodation costs of participants not elder than 35. The final amount of support can be determined after completion of the participation list. In addition we will be able to reimbourse the travel and accomodation expenses of the speakers. Reimboursement of travel costs can be only undertaken if the tickets (cheapest economy class air fare or second class train fare or bus fare) will be presented or if the actual costs do not exceed the aforementioned costs.

ORGANIZERS ADDRESS:

Professor Dimitrios Kolymbas
Institute of Geotechnics and Tunnelling
Innsbruck University
Techniker Str. 13
A-6020 Innsbruck, AUSTRIA

fax: +43/512/507-2296
mail: dimitrios.kolymbas@uibk.ac.at

DEADLINE FOR INSCRIPTION:

30. November 1996