What is it about?
Additive manufacturing of active structures, also referred to as 4D printing, could replace conventional motors in disciplines like biomedical engineering or robotics. In this work, metallic actuators are 3-D printed using an extrusion-based technique. The materials show good mechanical properties and a shape memory effect: they can be strained and the original shape recovers after exposure to high temperatures. The technique further allows the fabrication of more complex geometrical designs able to stand even greater deformations.
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Why is it important?
Most of the previous work on additive manufacturing active materials has so far focussed on polymeric materials, which often show poor mechanical properties and durability. At the same time, the few previous works on 3D printing shape memory alloys used 3D printing techniques requiring high local temperatures, often leading to high stresses that in turn are detrimental to the mechanical properties of the material. This research, therefore, opens the door for 4D printing applications requiring high mechanical properties.
Read the Original
This page is a summary of: Filament extrusion-based additive manufacturing of NiTi shape memory alloys, Materials & Design, January 2023, Elsevier, DOI: 10.1016/j.matdes.2022.111418.
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