Influence of stress on the transition behaviour of NiTi shape memory alloys for actuator applications
Influence of stress on the transition behaviour of NiTi shape memory alloys for actuator applications
Wednesday, May 18, 2022: 11:15 AM
Sunset Ballroom (Westin Carlsbad Resort)
Shape memory alloy (SMA) wires can be integrated into polymer matrices using additive manufacturing. Actuators produced in this way offer a wide range of shapes and wire integration appropriate to external loads is realisable. SMA wires made from NiTi and a polymer matrix are
co-deposited simultaneously using an ARBURG plastic freeformer. Actuation of the SMA is possible using conductive heating. Wires need to be embedded with initial tension to increase the austenite start temperature in order to prevent phase transition due to heat impact from the manufacturing process. An analytical material model is developed to predict the influence of stress to the transition temperature and phase transformation of the used SMA. The developed model is then validated by thermomechanical testing.
co-deposited simultaneously using an ARBURG plastic freeformer. Actuation of the SMA is possible using conductive heating. Wires need to be embedded with initial tension to increase the austenite start temperature in order to prevent phase transition due to heat impact from the manufacturing process. An analytical material model is developed to predict the influence of stress to the transition temperature and phase transformation of the used SMA. The developed model is then validated by thermomechanical testing.