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Ti-Ni Couplings for Pipelines

#0294


Development of an Experimental Technology for the Pipelines Demountable Joint by Couplings of Titanium Nickelide an Alloy with a Shape Memory Effect.

Tech Area / Field

  • MAT-ALL/High Performance Metals and Alloys/Materials

Status
8 Project completed

Registration date
26.10.1994

Completion date
20.03.2002

Senior Project Manager
Horowicz L

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

Collaborators

  • Advanced Materials and Technologies, Belgium, Herk-de-Stad\nTexas A&M University / Texas Engineering Experiment Station, USA, TX, College Station\nLawrence Livermore National Laboratory, USA, CA, Livermore\nIngenieursschule / Abteilung Maschinentechnik, Switzerland, Burgdorf

Project summary

The objective of the Project is to develop a novel advanced technology of pipelines demountable joint by couplings of titanium nickelide - an alloy with a shape memory effect CSME).

SHE alloys have wide application in technique and in particular they are used to connect the pipelines by means of couplings. As opposed to traditional joints by welding, soldering and others this connection shows high reliability, corrosion resistance, simplicity, high mounting tightness, opportunity to join pipes of different materials and thickness, as well as the absence of heat and electric effects.

A reversible shape memory effect (RSME) is of special importance for practical application. However, force characteristics of RSME are often unsatisfactory. At the same time it is known that Ti-Ni alloy, which is the most widely used in industry, after the impact acquires RSME with higher resistance to oppositely directed stresses. Based on a closer examination of this phenomenon and using another techniques, in contrast to available couplings of unidirectional single action, it is planned to develop a demountable joint of pipelines with higher resistance to stresses of opposite directions, using couplings made of titanium nickelide.

Scientific value - further development of experimental and computational techniques and acquisition of data on SME manifestation in different temperature-velocity conditions for titanium nickelide.

Commercial value is in the use of the developed technology of demountable joints by couplings of titanium nickelide (instead of traditional joints by welding, soldering, et al.) in nuclear power production, gas, chemical, food and other branches of industry).

The Project and manufacturing licenses may be sold to the third countries.

The Project will make it possible for 51 weapons scientists and specialists and 3 scientists who are not engaged in weapons programs to solve fundamental problems of practical significance.

The Project provides for:

- investigation of strain and heating rate impact on SME manifestation, on mechanical characteristics, chemical, phase and structural composition of Ti-Ni;

- development of measuring-computing system for the gas gun that will be used in tests;

- calculational technique elaboration to estimate geo-metric parameters of couplings that ensure the given strength;

- eleboration of a quality control technique for a joint being obtained.


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