Functional behavior of pseudoelastic niti alloy under variable amplitude loading

• Autorzy: Iasnii Volodymyr , Yasniy Petro , Lapusta Yuri , Yasniy Oleg , Dyvdyk Oleksandr

Identyfikatory

DOI

10.2478/ama-2020-0022

• Języki publikacji: EN

Abstrakty

EN

Cyclic loading of superelastic NiTi shape memory alloy (SMA) causes forward and reverse austenite–martensіte transfor-mations, and also increases the volume of stabilized martensite. This appears in the change of stress-strain curve form, the decrease of dissipation energy, and increase of residual strain, that is, named transformation ratcheting. In real structures, the SMA components in most cases are under the action of variable amplitude loading. Therefore, it is obvious that the loading history will influence the functional fatigue. In the present work, the effect of stress ratio on the functional properties of superelastic NiTi shape memory alloy under variable amplitude loading sequence with two blocks was investigated. The studies were carried out under the uniaxial tension of cy-lindrical specimens under load-full unload and load-part unload. The change of residual strain, strain range, dissipation, and cumulative dissipation energy density of NiTi alloy related to load sequences are discussed. Under both stress ratios, the residual strain in NiTi alloy is increased depending on the number of loading cycles on the high loading block that is similar to the tests at constant stress or strain amplitude. An unusual effect of NiTi alloy residual strain reduction with the number cycles is found at a lower block loading. There was revealed the effect of residual strain reduction of NiTi alloy on the number of loading cycles on the lower amplitude block. The amount of decrement of the residual strain during a low loading block is approximately equal to the reversible part of the residual strain due to the stabilized martensite. The decrease of the residual strain during the low loading block is approximately equal to the reversible part of residual strain due to the stabilized martensite. A good correlation of the effective Young’s modulus for both load blocks with residual strain, which is a measure of the volume of irreversible martensite, is observed.

Słowa kluczowe

EN

pseudoelastic alloy; NiTi alloy; functional fatigue; variable amplitude loading; strain range; residual strain; dissipation energy

• Wydawca: Oficyna Wydawnicza Politechniki Białostockiej
• Czasopismo: Acta Mechanica et Automatica
• Rocznik: 2020
• Tom: Vol. 14, no. 3
• Strony: 154--160
• Opis fizyczny: Bibliogr. 25 poz., rys., tab., wykr.

Twórcy

autor

Iasnii Volodymyr

• Department of Structural Mechanics, Ternopil Ivan Puluj National Technical University, Ruska str. 56, 46001 Ternopil, Ukraine

autor

Yasniy Petro

• Department of Structural Mechanics, Ternopil Ivan Puluj National Technical University, Ruska str. 56, 46001 Ternopil, Ukraine

autor

Lapusta Yuri

• Université Clermont Auvergne, SIGMA Clermont (ex-IFMA, French Institute of Advanced Mechanics), Institut Pascal, BP 10448, F-63000 Clermont-Ferrand, France, CNRS, UMR 6602, IP, F-63178 Aubière, France

autor

Yasniy Oleg

• Department of Structural Mechanics, Ternopil Ivan Puluj National Technical University, Ruska str. 56, 46001 Ternopil, Ukraine

autor

Dyvdyk Oleksandr

Bibliografia

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Uwagi

Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2021).