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TECHNICAL PAPERS

Training of the Two-Way Shape Memory Effect by Bending in NiTi Alloys

[+] Author and Article Information
R. Lahoz, J. A. Puértolas

Department of Materials Science and Technology, Centro Politécnico Superior, Universidad de Zaragoza- E-50018 Zaragoza. Spain

L. Gracia-Villa

Department of Mechanical Engineering, Centro Politécnico Superior, Universidad de Zaragoza- E-50018 Zaragoza. Spain

J. Eng. Mater. Technol 124(4), 397-401 (Sep 30, 2002) (5 pages) doi:10.1115/1.1495001 History: Received October 22, 2001; Revised April 04, 2002; Online September 30, 2002
Copyright © 2002 by ASME
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References

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Figures

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Scheme of the bending training test for obtaining TWSME and characteristic parameters
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Scheme of finite elements (FE) simulation for a pure bending mode in martensite NiTi wires. Tensile strain so deduced corresponding to the point of the generatrix denoted by A in the transversal section of the wire.
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(a) Stress-strain curve of the martensite state at room temperature and Vickers microhardness data at different deformation degrees of the martensite; (b) simplified martensite stress-strain behavior for FE simulations.
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Total (–), plastic ([[dashed_line]]) and elastic (⋅⋅⋅) strains in the intermediate and final positions during the bending on a disk with diameter ϕD=4.5 mm, deduced from FE simulation
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Evolution of two-way shape memory angle, θtw, during martensite deformation method, M-I, at different training disk diameters: (+) 2.8 mm, (∨) 4.5, (□) 5.75, (⋄) 9.5, (×) 12.0, (∧) 16.2, (○) 49.5
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Dependence of recovery angle, θtw, versus disks diameter after 10 cycles of training with the M-II method
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Evolution of two-way shape memory angle (θtw) as a function of the number of thermal cycles by the M-II method, for a training disk with a diameter ϕD=9.5 mm
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TWSME tensile strain as a function of training strain (εt) deduced from the FE simulation for M-I and M-II methods
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TWSME tensile strain deduced from FE simulation, as a function of the number of thermal cycles, for M-I and M-II methods, at different training strain (εt) (percent): (+) 17.7, (▿) 11.1, (□) 8.7, (⋄) 5.3, (×) 4.2, (▵) 3.1, (○) 1 percent

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