Characterization of NiTi Shape Memory Damping Elements designed for Automotive Safety Systems

J. Strittmatter, Victopr Clipa, V. Gheorghita, P. Gumpel

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Actuator elements made of NiTi shape memory material are more and more known in industry because of their unique properties. Due to the martensitic phase change, they can revert to their original shape by heating when subjected to an appropriate treatment. This thermal shape memory effect (SME) can show a significant shape change combined with a considerable force. Therefore such elements can be used to solve many technical tasks in the field of actuating elements and mechatronics and will play an increasing role in the next years, especially within the automotive technology, energy management, power, and mechanical engineering as well as medical technology. Beside this thermal SME, these materials also show a mechanical SME, characterized by a superelastic plateau with reversible elongations in the range of 8%. This behavior is based on the building of stress-induced martensite of loaded austenite material at constant temperature and facilitates a lot of applications especially in the medical field. Both SMEs are attended by energy dissipation during the martensitic phase change. This paper describes the first results obtained on different actuator and superelastic NiTi wires concerning their use as damping elements in automotive safety systems. In a first step, the damping behavior of small NiTi wires up to 0.5 mm diameter was examined at testing speeds varying between 0.1 and 50 mm/s upon an adapted tensile testing machine. In order to realize higher testing speeds, a drop impact testing machine was designed, which allows testing speeds up to 4000 mm/s. After introducing this new type of testing machine, the first results of vertical-shock tests of superelastic and electrically activated actuator wires are presented. The characterization of these high dynamic phase change parameters represents the basis for new applications for shape memory damping elements, especially in automotive safety systems
Original languageEnglish
Pages (from-to)2696-2703
JournalJournal of Materials Engineering and Performance
Volume23
Issue number7
DOIs
Publication statusPublished - 2014
Externally publishedYes

Fingerprint

Shape memory effect
Security systems
Damping
Actuators
Testing
Wire
Impact testing
Mechatronics
Tensile testing
Energy management
Mechanical engineering
Martensite
Austenite
Elongation
Energy dissipation
Heating
Industry
Temperature
Hot Temperature

Bibliographical note

The final publication is available at Springer via http://dx.doi.org/10.1007/s11665-014-1045-1.

Keywords

  • dynamic testing plant
  • dynamic tests
  • Ni-Ti wires
  • shape memory alloy

Cite this

Characterization of NiTi Shape Memory Damping Elements designed for Automotive Safety Systems. / Strittmatter, J.; Clipa, Victopr; Gheorghita, V.; Gumpel, P.

In: Journal of Materials Engineering and Performance, Vol. 23, No. 7, 2014, p. 2696-2703.

Research output: Contribution to journalArticle

Strittmatter, J. ; Clipa, Victopr ; Gheorghita, V. ; Gumpel, P. / Characterization of NiTi Shape Memory Damping Elements designed for Automotive Safety Systems. In: Journal of Materials Engineering and Performance. 2014 ; Vol. 23, No. 7. pp. 2696-2703.
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