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Materials with shape memory effect

#3166


Study of Physical-Mechanical Properties of Materials with Shape Memory Effect with Account for Phase Transitions

Tech Area / Field

  • PHY-STM/Structural Mechanics/Physics
  • MAT-ALL/High Performance Metals and Alloys/Materials
  • OBS-OTH/Other/Other Basic Sciences

Статус
3 Approved without Funding

Дата регистрации
01.12.2004

Ведущий институт
VNIIEF, Russia, N. Novgorod reg., Sarov

Поддержка институтов

  • State University of Nizhny Novgorod / Research Intitute of Mechanics, Russia, N. Novgorod reg., N. Novgorod

Соавторы

  • Los Alamos National Laboratory / Materials Science and Technology Division, USA, NM, Los-Alamos\nPurdue University / School of Aeronautics and Astronautics, USA, IN, West Lafayette\nScandinavian Memory Metals AB, Sweden, Saltsjobaden

Краткое описание проекта

Presently a set of technical problems is known, solution of which requires application of alloys having shape memory. They include termomechanical connections, drive mechanisms, devices for fixing and disconnection. At heating an active element having shape memory in these devices, deformation can occur both non-homogeneously and immediately in all its volume. Here a series of practical problems can be effectively and naturally solved. For designing such devices, it is evidently necessary to have knowledge on regularities of shape memory phenomenon in various ranges of temperatures and stresses, and to know methods for theoretical calculation of strain and stress under these conditions. At the same time, the shape memory phenomenon is associated with martensate transformations. And for understanding deformation mechanisms induced by phase transformations, it is necessary to perform structural researches. Revealing of the relation between structural transitions and mechanical properties and loading parameters will allow to create models of alloys behavior, and to suggest practical application of revealed regularities.

The goal of the proposed project is experimental and theoretical researches of physical and mechanical properties of alloys having shape memory (titanium-nickel and titanium-nickel-copper) under various temperature-velocity conditions of loading, as well as development of models of behavior of the listed alloys and suggestions for practical applications.

Technical approach and methodology

To solve the project objectives, the following methods are planned to be used:

- methods of dynamic loading with application of gas gun, HE explosion;

- metallographic and fractographic methods;

- methods for fractal geometry and the percolation theory;

- methods for calculation of properties of alloys having shape memory based on macroscopic and phenomenological theories and the microstructural model – “structural-analytical theory of strength”.

Expected results and their application

The following results will be obtained under the project framework:

Methods for study the shape memory phenomenon, methods for determination of time of phase transitions and estimation of energy of activation of phase transitions will be developed.

Experimental data on regularities of dynamic deformation of alloys having shape memory (titanium-nickel, titanium-nickel-copper) will be obtained.

Models of alloys behavior will be developed, and recommendations for their practical application will be formulated.

Scientific value of project consists in obtainment of unique information on properties of materials having shape memory under various temperatures and mechanical effects.

Practical value of project is determined by interest in aerospace industry, gas-and-oil producing industry, automobile and railway industries, and the other applications when designing equipment having active elements with shape memory.

Scope of activities

Under the project framework:

VNIIEF and RIM NNSU will perform experimental researches of dynamical properties of chosen materials.

VNIIEF will perform metallographic and fractographic analyses of tested samples with the purpose to study evolution of structure.

VNIIEF and RIM NNSU will develop models of behavior of alloys having shape memory and formulate recommendations for practical application of its.


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