TWSME of a NiTi strip in free bending conditions: experimental and theoretical approach
This paper deals with the two-way shape memory effect (TWSME) induced on a strip of a nearequiatomic NiTi alloy by means of the shape memory cycling training method. This procedure is based on the deformation in martensite state to reach the desired cold shape followed by cycling the temperature f...
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Gruppo Italiano Frattura
2014-07-01
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| Series: | Fracture and Structural Integrity |
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| Online Access: | http://www.gruppofrattura.it/pdf/rivista/numero29/numero_29_art_8.pdf |
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| author | A. Fortini M. Merlin R. Rizzoni S. Marfia |
| author_facet | A. Fortini M. Merlin R. Rizzoni S. Marfia |
| author_sort | A. Fortini |
| collection | DOAJ |
| description | This paper deals with the two-way shape memory effect (TWSME) induced on a strip of a nearequiatomic
NiTi alloy by means of the shape memory cycling training method. This procedure is based on the
deformation in martensite state to reach the desired cold shape followed by cycling the temperature from above
Af to below Mf. To this end, the sample was thermally treated to memorise a bent shape, thermomechanical
trained as described and thermally cycled in unloaded conditions in order to study the stability of the induced
TWSME. Heating to Af was reached by a hot air stream flow whereas cooling to Mf was achieved through
natural convection. The evolution of the curvature with the increasing number of cycles was evaluated. The
thermomechanical behaviour of the strip undergoing uniform bending was simulated using a one-dimensional
phenomenological model based on stress and the temperature as external control variables. Both martensite and
austenite volume fractions were chosen as internal parameters and kinetic laws were used in order to describe
their evolution during phase transformations. The experimental findings are compared with the model
simulation and a numerical prediction based on the approach proposed in [25]. |
| format | Article |
| id | doaj-art-b51a04158d5b4278b532a8f0594b78ca |
| institution | Kabale University |
| issn | 1971-8993 1971-8993 |
| language | English |
| publishDate | 2014-07-01 |
| publisher | Gruppo Italiano Frattura |
| record_format | Article |
| series | Fracture and Structural Integrity |
| spelling | doaj-art-b51a04158d5b4278b532a8f0594b78ca2025-01-02T22:38:53ZengGruppo Italiano FratturaFracture and Structural Integrity1971-89931971-89932014-07-01829748410.3221/IGF-ESIS.29.08TWSME of a NiTi strip in free bending conditions: experimental and theoretical approachA. Fortini0M. Merlin1R. Rizzoni2S. Marfia3University of FerraraUniversity of FerraraUniversity of FerraraUniversity of Cassino and Lazio MeridionaleThis paper deals with the two-way shape memory effect (TWSME) induced on a strip of a nearequiatomic NiTi alloy by means of the shape memory cycling training method. This procedure is based on the deformation in martensite state to reach the desired cold shape followed by cycling the temperature from above Af to below Mf. To this end, the sample was thermally treated to memorise a bent shape, thermomechanical trained as described and thermally cycled in unloaded conditions in order to study the stability of the induced TWSME. Heating to Af was reached by a hot air stream flow whereas cooling to Mf was achieved through natural convection. The evolution of the curvature with the increasing number of cycles was evaluated. The thermomechanical behaviour of the strip undergoing uniform bending was simulated using a one-dimensional phenomenological model based on stress and the temperature as external control variables. Both martensite and austenite volume fractions were chosen as internal parameters and kinetic laws were used in order to describe their evolution during phase transformations. The experimental findings are compared with the model simulation and a numerical prediction based on the approach proposed in [25].http://www.gruppofrattura.it/pdf/rivista/numero29/numero_29_art_8.pdfNiTi-based alloys; two-way shape memory effect; thermomechanical training; bending. |
| spellingShingle | A. Fortini M. Merlin R. Rizzoni S. Marfia TWSME of a NiTi strip in free bending conditions: experimental and theoretical approach Fracture and Structural Integrity NiTi-based alloys; two-way shape memory effect; thermomechanical training; bending. |
| title | TWSME of a NiTi strip in free bending conditions: experimental and theoretical approach |
| title_full | TWSME of a NiTi strip in free bending conditions: experimental and theoretical approach |
| title_fullStr | TWSME of a NiTi strip in free bending conditions: experimental and theoretical approach |
| title_full_unstemmed | TWSME of a NiTi strip in free bending conditions: experimental and theoretical approach |
| title_short | TWSME of a NiTi strip in free bending conditions: experimental and theoretical approach |
| title_sort | twsme of a niti strip in free bending conditions experimental and theoretical approach |
| topic | NiTi-based alloys; two-way shape memory effect; thermomechanical training; bending. |
| url | http://www.gruppofrattura.it/pdf/rivista/numero29/numero_29_art_8.pdf |
| work_keys_str_mv | AT afortini twsmeofanitistripinfreebendingconditionsexperimentalandtheoreticalapproach AT mmerlin twsmeofanitistripinfreebendingconditionsexperimentalandtheoreticalapproach AT rrizzoni twsmeofanitistripinfreebendingconditionsexperimentalandtheoreticalapproach AT smarfia twsmeofanitistripinfreebendingconditionsexperimentalandtheoreticalapproach |