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Proceedings Paper

Elastic fields in NiTi shape memory alloys
Author(s): Teodor M. Breczko; Krzysztof Kus
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Paper Abstract

This paper includes the results of experimental investigation and calculations of changes in residual stresses in NiTi shape memory alloys. For this purpose, the test of thermal and mechanical loading on the samples of Ni50Ti50 was performed. One-way and two-way shape memory effects were observed during loading and heating, i.e. SME alloy can be deformed, then recover its original shape when heated to a certain temperature. After this experiment the investigation using X-ray method was performed. In our experiments we used X-ray diffraction of the austenite phase of NiTi at room temperature to investigate the changes of elastic fields during thermal and mechanical loading. Diffractometer data were used for calculations of residual stresses. Root-mean- square (RMS) strains and sizes of coherent scattering regions were calculated using harmonic analysis. Based on the experimental data, the modeling results are depicted. Computer simulation takes into consideration martensite transformations, twinning, elastic and irreversible deformations. The result of thermal and mechanical loading and computer simulation provide data for shape memory alloys behavior under cyclic loading.

Paper Details

Date Published: 1 February 2001
PDF: 7 pages
Proc. SPIE 4348, Fourth International Workshop on Nondestructive Testing and Computer Simulations in Science and Engineering, (1 February 2001);
Show Author Affiliations
Teodor M. Breczko, Warmia and Masuria Univ. (Poland)
Krzysztof Kus, Warmia and Masuria Univ. (Poland)

Published in SPIE Proceedings Vol. 4348:
Fourth International Workshop on Nondestructive Testing and Computer Simulations in Science and Engineering
Alexander I. Melker, Editor(s)

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