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<p>As the aerospace sector aims to decrease its greenhouse gas emissions from historical levels, vehicle lightweighting is seen as key to achieving meaningful reductions in the sector. Shape memory alloy (SMA) materials have been shown to have extremely high work density that, when applied in an actuator, can yield significant weight savings compared to electric motor and hydraulic powered alternatives. Following a collaboration between Kinitics Automation Limited (Kinitics) and The Boeing Company (Boeing), a high torque rotary actuator was developed which can be scaled to accommodate a wide range of aerospace applications. Developed as a line replaceable unit (LRU), the rotary actuator needed to meet strict requirements as&#xa0;are typically demanded by the aerospace sector. By leveraging the reconfigurable nature of the actuator, two SMA tube elements were tested under various loads. Conversion of applied torque and angular displacement into the SMA tube elements shear stress-shear strain behavior allowed the elements to be directly compared. Analysis of the data indicated significant differences in the actuation shear strain capabilities of the two SMA elements under test. Benefits of utilizing the actuator as an in situ SMA element tester included reuse, interface simplification, and reduced uncertainty.</p>

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Application of Shape Memory Alloys Inside a Ram Air Door Rotary Actuator

  • 期刊论文

  • 发表日期：

    2025年9月28日

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  • Dean Pick,
  • Ryan Richman,
  • Daniel Tran,
  • Frederick Calkins,
  • Douglas E. Nicholson,
  • Zachary Jones,
  • Jason Steadele

摘要

As the aerospace sector aims to decrease its greenhouse gas emissions from historical levels, vehicle lightweighting is seen as key to achieving meaningful reductions in the sector. Shape memory alloy (SMA) materials have been shown to have extremely high work density that, when applied in an actuator, can yield significant weight savings compared to electric motor and hydraulic powered alternatives. Following a collaboration between Kinitics Automation Limited (Kinitics) and The Boeing Company (Boeing), a high torque rotary actuator was developed which can be scaled to accommodate a wide range of aerospace applications. Developed as a line replaceable unit (LRU), the rotary actuator needed to meet strict requirements as are typically demanded by the aerospace sector. By leveraging the reconfigurable nature of the actuator, two SMA tube elements were tested under various loads. Conversion of applied torque and angular displacement into the SMA tube elements shear stress-shear strain behavior allowed the elements to be directly compared. Analysis of the data indicated significant differences in the actuation shear strain capabilities of the two SMA elements under test. Benefits of utilizing the actuator as an in situ SMA element tester included reuse, interface simplification, and reduced uncertainty.