WEB Material Selection for temperature sensitive actuators manufactured from shape memory alloy wires embedded in polymer structuresRoom 2
Additive manufacturing allows the integration of shape memory wires into polymer matrices. Actuators produced in this way offer a wide range of shapes and wire integration appropriate to external loads is realisable. Prestrained NiTi wires and a polymer matrix are co-deposited simultaneously using an ARBURG plastic freeformer. Actuation of the shape memory alloy is possible using conductive heating. Amorphous thermoplastics with high glass transformation temperature and high tensile strain at yield are preferred matrix materials. Material selection based on ashby maps implied that ABS, PC and PA are the most promising matrix materials processible with the ARBURG freeformer. Mechanical characterisation revealed the best matrix material for this purpose. As a next step, adhesion between NiTi wire and the matrix material will be investigated.