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Computer Modeling of Ceramics Pressing

#2040


Developing of Code for Modeling of the Processes of Ceramics Pressing

Tech Area / Field

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

Status
8 Project completed

Registration date
10.11.2000

Completion date
06.10.2004

Senior Project Manager
Alexandrov K A

Leading Institute
State Unitary Enterprise STRELA, Russia, Chelyabinsk reg., Snezhinsk

Project summary

One of the actual problems which oil and gas companies want to simulate is the creation, using a diamond anvil press, of ultra-high-hardness materials (ceramics) to be used in oil and gas well drilling. There are some reasons to believe that harder materials than presently possible can be created if the temperature and pressure in the region of compression can be carefully controlled as a function of time during the ceramics creation. (Private communications with Lr.Dale Nielsen, Jr. (Lawrence Livermore National Laboratory).

As a test problem for the code which can be used for the process of ceramics pressing modeling the following problem may be considered (Private communications with Dr. Dale Nielsen, Jr. (Lawrence Livermore National Laboratory). (see Fig.1).

Fig.1. The initial geometry of the cube pressing problem.

The aluminum cube presented in Fig.1 is compressed by rigid anvils. The action of anvils causes large elastic-plastic deformations of the cube resulting in thin “gaskets” of aluminum which extend like “fins” from the edge of a smaller cube. During compression the behavior of the matter is very complicated. There appear a region of elastic deformation, regions of static, quasi-static and dynamic plastic deformations. So the physical model should allow to account all kinds of possible plastic deformations.

Because of the complicated character of the deformations the most appropriate approach to the modeling of the described problem 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.

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 proposed activity is to show the applicability of free-lagrangian approach to the modeling of the elastic-plastic flows taking place during the compression of the aluminum cube by diamond anvils.


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