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Materials Strengths in Accidental Situations

#2146


Experimental and Theoretical Study of Strengths of Structural Materials as Applied to Accidental Situations at Nuclear Facilities

Tech Area / Field

  • FIR-NSS/Nuclear Safety and Safeguarding/Fission Reactors
  • PHY-STM/Structural Mechanics/Physics

Status
8 Project completed

Registration date
27.03.2001

Completion date
19.10.2005

Senior Project Manager
Pradas-Poveda J I

Leading Institute
VNIIEF, Russia, N. Novgorod reg., Sarov

Supporting institutes

  • Institute of Continuous Media Mechanics, Russia, Perm reg., Perm

Collaborators

  • Centre D'Etudes de Gramat, France, Gramat\nDepartment of the Navy / Indian Head Division/Naval Surface Warfare Center, USA, DC, Washington\nUniversity of Rome, Italy, Rome\nMichigan Technological University, USA, MI, Houghton\nBrown University / Division of Engineering, USA, RI, Providence\nLawrence Livermore National Laboratory, USA, CA, Livermore\nGeorgia Institute of Technology / School of Materials Science and Engineering, USA, GA, Atlanta

Project summary

Introduction and Overview.

Technical capabilities of high-energy devices are closely associated with science of fracture, since the limiting capabilities of designs are associated with resistance of units, including: thermal-mechanical resistance of shells of nuclear power plants (NPP) fuel elements; resistance of casing elements and containment of NPP; resistance of the first wall of thermonuclear reactor, etc.


Fracture of materials of technologically risky designs as NPP can cause large-scale catastrophic consequences. Therefore study of deformation and fracture of nuclear facilities materials under dynamic loading is an urgent fundamental and applied problem.
At the same time the direct researches of some materials (for example, materials of the NPP active zone) are strongly impeded because of high radioactivity and toxicity. Researches of various materials reveal that at their fracture the common regularities are manifested itself that allows describing the fracture process in the mathematical terms. It gives opportunities to use models of researched materials for prediction of behavior of unresearched materials under conditions of dynamic loading.


Goal of the proposed project is experimental and theoretical research of deformation and fracture of some materials (steels of various types, copper, aluminum alloys, alloy Ti-Ni) under dynamic loading, and development of models which are supposed to be used for estimation of strength of materials for modern nuclear facilities (NPP).


Highly skilled experts of RFNC-VNIIEF will perform the project and scientists from ISM UB RAS are recognized by their works in Russia and abroad.

Technical Approach and Methodology


To solve the project objectives, the following methods are planned to be used:
- methods of dynamic loading with application of energy of impact testing machine, powder gun, HE explosion;
- metallographic and fractographic methods;
- calculation means, methods for fractal geometry and the percolation theory;
- static description of collective effects in mesodefects ensemble.


Expected Results and their Application

The following results will be obtained under the project framework:
· properties of materials under dynamic loading with strain rates 102-104 s-1 will be researched;
· relation between the nonlinear behavior of ensemble of typical mesodefects and relaxation ability of materials (including fracture) will be revealed;
· models of deformation and fracture of tested materials will be developed for prediction of behavior of materials of nuclear facilities under conditions of dynamic loading.

Scientific value of Project consists in obtainment of unique information on deformation and fracture some structural materials in temperature-time loading conditions simulating accidental situations at NPP.

Applied value of Project is determined by industry interest for designing items of modern nuclear facilities with the purpose to improve reliability of designs and reduction of possible consequences of accidental situations at NPP.

Scope of Activities


Under the project framework:
RFNC-VNIIEF and ISM UB RAS will perform experimental researches of dynamic properties of the chosen materials.
RFNC-VNIIEF and ISM UB RAS will perform metallographic and fractographic analysis of tested samples with the purpose to study evolution of structure, formation of fracture centers stages, and description of nonlinear behavior of typical mesodefects.
RFNC-VNIIEF and ISM UB RAS will develop models of deformation and fracture of tested materials with the purpose to use them for estimation of strength of nuclear facilities materials under conditions of accidental situations.


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