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Large Deformation Technology Modeling

#2831


Developing of 3D Code for Modeling of the Technological Processes of Loading and Pressing Involving Large Deformations

Tech Area / Field

  • INF-COM/High Performance Computing and Networking/Information and Communications
  • INF-SOF/Software/Information and Communications
  • MAT-CER/Ceramics/Materials

Статус
3 Approved without Funding

Дата регистрации
21.07.2003

Ведущий институт
Neurok Techsoft Ltd, Russia, Moscow

Поддержка институтов

  • St Petersburg State University / Mathematic-Mechanical Faculty / Smirnov Scientific Research Institute of Mathematics and Mechanics, Russia, St Petersburg

Соавторы

  • Livermore Software Technology Corporation, USA, CA, Livermore

Краткое описание проекта

There are a lot of technological problems, which could be modeled using 3D dynamical engineering codes (LS-DYNA, ANSYS, etc.). Among them one can find the processes of ceramics pressing, the processes of plastics and metal extrusion, the processes of shock wave welding, the processes of details hardening and so on. A large number of technological modeling problems deal with the problem of finding of an optimal configuration of technological equipment and with an optimization of the process (i.e. loading and heating regimes). That is the reason why popular CAE codes have optimization tools inside them.

Because of the complicated character of the deformations the most appropriate approach to the modeling of the described problems is a lagrangian one. But use of the common regular or finite element lagrangian codes meets difficulties. These difficulties are connected with the well-known fact, that in such kind of flows lagrangian volumes, which were close one to another may in some time appear to be very far one from another. Thus commonly used lagrangian methods on regular grids can’t be used without special methods of grid reconstructing. Such reconstruction leads to the well – known problem of solution smoothing.

This proposal is devoted to the development of a perspective three-dimensional code for elastic-plastic flows with large deformations modeling. It is the irregular grid method, based on the presentation of the flow region by the Voronoi cells. Such methods were first elaborated by Prof. Sofronov et al. Then, after a long delay, these methods were discussed at the conference on Free Lagrangian Methods in Albuquerque, NM, 1984. After that conference these methods received the name: «Free Lagrangian Methods».

The main goal of the project is the development of the code, which gives an opportunity of modeling large elastic-plastic deformations to an engineer. This code is supposed to be incorporated as a tool in LS-DYNA code. It should contain the optimization module, based on global neural network approximation of the objective function and its constrains.

The team from NeurOK Technical Software Company consists of former weapon scientists, who have been working in Russian Federal Nuclear Center – VNIITF (Snezhinsk). It has experience in large deformations modeling - the 2D code for gas dynamics with large deformations and heat transfer modeling has been created by the team in 1997 under the contract B329117 with Lawrence Livermore National Laboratory.

A part of the team has twelve years experience in the fields of computer simulation, neural networks modeling and optimization.

The team from “Research Center of Dynamics” from Sankt Peterburg has large experience in mathematical models for plastic deformation process constructing. These models are based on the determination of characteristic time of dislocation motion, which is a very robust material characteristic.


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