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TECHNICAL PAPERS

Mechanical Behavior of a Cu-Al-Be Shape Memory Alloy Under Multiaxial Proportional and Nonproportional Loadings

[+] Author and Article Information
Christophe Bouvet, Christian Lexcellent

Laboratoire de Mécanique Appliquée R. Chaléat, UMR CNRS 6604/Université de Franche-Comté, 24, rue de l’épitaphe, F-25000 Besançon, France

Sylvain Calloch

Laboratoire de Mécanique et Technologie, ENS de Cachan/UMR CNRS 8535/ Université Paris 6, 61, avenue du Président Wilson, F-94235 Cachan Cedex, France

J. Eng. Mater. Technol 124(2), 112-124 (Mar 26, 2002) (13 pages) doi:10.1115/1.1448324 History: Received March 15, 2001; Revised November 15, 2001; Online March 26, 2002
Copyright © 2002 by ASME
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References

Figures

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Triangular nonproportional loading path for a biaxial compression test. (a) Loading path; (b) total strain response; (c) stress-strain curves in (εxxxx) plane; (d) stress-strain curves in (εyyyy) plane.
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Compilation of experimental results and J2-J3 criterion of initial transformation onset surface
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von Mises, triangular, and J2-J3 criteria of transformation onset surface in the stress deviator plane and interpretation of two of the three stress invariants
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Proportional tension-internal pressure tests numbered in chronological order
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Tension/compression asymmetry
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Transformation onset stress versus temperature; influence of the offset
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Stress-strain curves for different temperatures under tensile loading (the tension tests at 57°C is not plotted for readable purposes)
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Determination of characteristic transformation temperatures by electric resistivity
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Tension-compression/internal pressure test and bi-compression test, two complementary tests
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Stress-strain curves under tension-internal pressure loading. (a) In (εzzzz) plane; (b) in (εθθθθ) plane.
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Transformation onset curve for a tension/internal pressure test
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Square nonproportional loading path for a tension-internal pressure test. (a) Loading path; (b) total strain response; (c) stress-strain curves in (εzzzz) plane; (d) stress-strain curves in (εθθθθ) plane.
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Triangular nonproportional loading path for a tension-internal pressure test. (a) Loading path; (b) total strain response; (c) stress-strain curves in (εzzzz) plane; (d) stress-strain curves in (εθθθθ) plane.
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(a) The multiaxial testing machine, Astree; (b) schematic of the centroid control system for one axis
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Biaxial compression setup before (a) and after (b) control by a full-field displacement measurement
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Stress versus strain. (a) Under uniaxial compression (before the set-up modification); (b) under equibiaxial compression (before the set-up modification); (c) under uniaxial compression (after the set-up modification); (d) under equibiaxial compression (after the set-up modification).
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Displacement fields. (a) Under equibiaxial compression (before the set-up modification); (b) under equibiaxial compression (after the set-up modification); (c) under uniaxial compression (after the set-up modification); (d) under uniaxial compression (after the set-up modification).
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Description of the automatic strategy for the detection of the transformation onset stress
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Transformation onset stress under biaxial compression loading for different offsets
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Square nonproportional loading path for a biaxial compression test. (a) Loading path; (b) total strain response; (c) stress-strain curves in (εxxxx) plane; (d) stress-strain curves in (εyyyy) plane.
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Circular nonproportional loading path for a biaxial compression test. (a) Loading path; (b) total strain response; (c) stress-strain curves in (εxxxx) plane; (d) stress-strain curves in (εyyyy) plane.
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Triangular nonproportional loading path for a biaxial compression test. (a) Loading path; (b) total strain response; (c) stress-strain curves in (εxxxx) plane; (d) stress-strain curves in (εyyyy) plane.

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