Shape memory alloy based 3D printed composite actuators with variable stiffness and large reversible deformation

Abstract Soft composite actuators can be fabricated by embedding shape memory alloy (SMA) wires into soft polymer matrices. Shape retention and recovery of these are typically achieved incorporating segments the actuator structure. However, this requires complex manufacturing processes. This work uses multimaterial 3D printing to fabricate with variable stiffness capable recovery. The hinges bending presented here printed from a elastomeric layer as well rigid (SMP) layer. SMA embedded eccentrically over entire length structure provide actuation force, while resistive SMP change temperature via Joule heating. wire is changed sequentially accomplish large deformation, deformed shape, original without applying any external mechanical force. thickness was varied investigate its effect on A nonlinear finite element model used predict deformation actuators.