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Abstract: Shape memory alloy (SMA) is noticed for its special
thermomechanical properties in the research on smart structural actuator
system. SMA torsion actuator is made up of nickel-titanium alloy wire
and a thin-walled tube, in which plastically elongated wire is wound and
pasted on a tube with a certain angle referenced to the generatrix of
the tube. SMA torsion actuator can yield torsion deformation and moment,
which may provide new ideas for wing control system design. SMA wire
wound angle is an important parameter that affects actuator primary
performances. For actuators with SMA wire wound angles of 40°, 45°, 55°,
60° and 75°, the experimental curves of temperature-wound angle-torsion
angle and torque are obtained under free, fixed and flexible-restricted
conditions. Results show that actuator, with wound angle of 60°, can
produce the maximum torsion angle and the maximum moment. The research
is of important value to the investigation of mechanical model and
structural parameter optimization of SMA torsion actuators.
Key words: SMA torsion actuator Wound angle of SMA wire Primary
performance Experimental research
CLC No: V249 V259
国家自然科学基金资助项目(50135030、90205031). Received 20021211, received in revised
form 20030506
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