20 July 1998 Torsional behavior of shape memory alloys
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This study investigates the properties of TiNi and TiNi-Cu (K- alloy) Shape Memory Alloys and their behavior in torsion (uniaxial) and combined tension-torsion (biaxial). Test results include torque versus angle curves and recovery torque versus pretwist for both uniaxial and biaxial loading. Preliminary results for low cycle fatigue are also presented. The wall thickness of the torque tube influences all of these curves considerably due to the gradation of stresses and strains through the thickness. All test data presented in this paper is for moderate torques where maximum shear strains are below 3.5% and as such represent an actuator capable of long fatigue life, based on previous experimental data for wire systems. A theoretical model for recovery torque is also described.
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Andrew C. Keefe, Gregory Paul Carman, and A. Peter Jardine "Torsional behavior of shape memory alloys", Proc. SPIE 3324, Smart Structures and Materials 1998: Smart Materials Technologies, (20 July 1998); doi: 10.1117/12.316849; https://doi.org/10.1117/12.316849

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