Elastic fields in NiTi shape memory alloys

Teodor M. Breczko; Krzysztof Kus

doi:10.1117/12.417646

1 February 2001 Elastic fields in NiTi shape memory alloys

Teodor M. Breczko, Krzysztof Kus

Proceedings Volume 4348, Fourth International Workshop on Nondestructive Testing and Computer Simulations in Science and Engineering; (2001) https://doi.org/10.1117/12.417646
Event: Fourth International Workshop on Nondestructive Testing and Computer Simulations in Science and Engineering, 2000, St. Petersburg, Russian Federation

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.

Citation Download Citation

Teodor M. Breczko and Krzysztof Kus "Elastic fields in NiTi shape memory alloys", Proc. SPIE 4348, Fourth International Workshop on Nondestructive Testing and Computer Simulations in Science and Engineering, (1 February 2001); https://doi.org/10.1117/12.417646

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