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Development of residual stresses in shape memory alloys under thermomechanical cycle loadings

In this paper the experimental measurement results of the residual stresses in shape memory alloys (SMA's) are discussed. The experimental data are based on the investigation of the changes in root-mean-square (RMS) micro-strains and size of coherent blocks. The study was performed on the samples of Ni50,6Ti49,4 alloy that were subjected to cyclic thermo-mechanical loading. To induce reversible martensite transformations in the material, the external loading was used with subsequent data recording using x-ray method. The results of experimental measurements of the RMS micro-strains and coherent block sizes in austenite phase are presented. Based on the experimental data the computer simulation results are presented. Experimental and theoretical results have shown that the changes of structural parameters can be helpful for evaluate of functional characteristics of NiTi alloys.