Residual stresses and shape memory effect

• Autorzy: Breczko T. , Kus K.
• Języki publikacji: EN

Abstrakty

EN

It is possible to estimate the reliability of the materials during their use by recording the changes in defect density of polycrystalline structure, which can be estimated on residual stresses at a crystal nufactured using shape memory alloy (SMA) are presented. The experimental data are based on the investigation of the changes in the root-mean-square (RMS) micro-strains and size of coherent block in the SMA caused by thermal and mechanical loading. The study is performed on the samples of aproximately equiatomic TiNi alloy. To induce the reversible martensite transformations in the material the external loading is applied with subsequent data recording using the X-ray method. The results of experimental measurements of the RMS microst rain and coherent block size in austenite are presented. Basing on the experimental data a modified (by Brechko [4-5]) mathematical model of Likhachev and Malinin [3] is proposed, which is used in the computer simulations including the martensite transformations, twining, elastic and irreversible deformations. The experimental and computer modeling results of stress and strain field generated by the defect in polycrystalline materials are discussed.

• Wydawca: Wydawnictwo Instytutu Maszyn Przepływowych PAN
• Czasopismo: Transactions of the Institute of Fluid-Flow Machinery
• Rocznik: 2001
• Tom: nr 108
• Strony: 33--45
• Opis fizyczny: Bibliogr. 7 poz., rys.

Twórcy

autor

Breczko T.

• Unversity of Warmia and Mazury, Faculty of Engineering Sciences, Olsztyn, Poland

autor

Kus K.

• Unversity of Warmia and Mazury, Faculty of Engineering Sciences, Olsztyn, Poland

Bibliografia

• [1] Stalmans R. and Van Humbeeck J.; Shape memory alloys: functional and smart at world wide web: http: //www,mtm.kuleuven/Research/Physica1/ShapeMem/smatex.htm (1996).
• [2] Shaken C, Noori M. N. and Hou Z.: Smart materiah and structures; A review, at world wide web: http://me.wpi.edu/cirruc/Publications/Smart-Materials/SmartMaterialExtension.html.
• [3] Likhachev V. A.. Malinin V. G.: Structural and analytical, strength, theory, Nauka. St. Petersburg 1993. (in Russian).
• [4] Breczko T.: Evolution of defect structure in the course of irreversible deformation of polycrystals, Rus. Journ. of Phys. Chem., 8(1995). 1376.
• [5] Breczko T.: Shape memory effect and residual stresses, Tech. Phys., 41(1996), 1123 (American Institute of Physics).
• [6] Breczko T.: Plastic deformation of polycrystals, Pabl. of Bialystok Technical University, (1981) 33, (in Polish).
• [7] Breczko T., Kus K.: Elastic fields in NiTi shape memory alloys, Proc. of SPIE (2001), vol. 4348, 173-188.