12 July 1999 Thermomechanical characterization of shape memory alloy torque tubes
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The thermo-mechanical characteristics of four NiTi based SMA torque tubes are investigated under simple torsional loading. Results from the thermo-mechanical tests are presented for samples when fully martensitic, fully austenitic, and recovery torque measurements. Test results indicate that wall thickness plays a prominent role in the results. An analytical model was developed as a function of geometry and experimentally determined material properties. The model predicts the torque versus angular deformation for a wide range of tube geometries when in martensite and austenite. The distribution of strain through the thickness is assumed to vary non-linearly as an exponentially with the radius. The analytical results reflect the mechanical behavior reasonably well.
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Andrew C. Keefe, Andrew C. Keefe, Gregory Paul Carman, Gregory Paul Carman, "Thermomechanical characterization of shape memory alloy torque tubes", Proc. SPIE 3675, Smart Structures and Materials 1999: Smart Materials Technologies, (12 July 1999); doi: 10.1117/12.352811; https://doi.org/10.1117/12.352811

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