Researchers take printing into the fourth dimension

A team led by H. Jerry Qi, associate professor of mechanical engineering at CU-Boulder, and his collaborator Martin L. Dunn of the Singapore University of Technology and Design has developed and tested a method for 4D printing.

The researchers incorporated shape memory polymer fibres into the composite materials used in traditional 3D printing, which results in the production of an object fixed in one shape that can later be changed to take on a new shape.

‘In this work, the initial configuration is created by 3D printing, and then the programmed action of the shape memory fibres creates time dependence of the configuration – the 4D aspect,’ Dunn said in a statement.

The 4D printing concept, which allows materials to self-assemble into 3D structures, was initially proposed by Massachusetts Institute of Technology faculty member Skylar Tibbits in April this year. Tibbits and his team combined a strand of plastic with a layer made out of a so-called smart material that could self-assemble in water.

‘We advanced this concept by creating composite materials that can morph into several different, complicated shapes based on a different physical mechanism,’ said Dunn. ‘The secret of using shape memory polymer fibres to generate desired shape changes of the composite material is how the architecture of the fibres is designed, including their location, orientation and other factors.’

The CU-Boulder team’s findings were published last month in the journal Applied Physics Letters. The paper was co-authored by Qi ‘Kevin’ Ge, who joined MIT as a postdoctoral research associate in September.

‘The fascinating thing is that these shapes are defined during the design stage, which was not achievable a few years ago,’ said Qi.

The CU-Boulder team demonstrated that the orientation and location of the fibres within the composite determines the degree of shape memory effects like folding, curling, stretching or twisting. The researchers also showed the ability to control those effects by heating or cooling the composite material.

Qi said 3D printing technology, which has existed for about three decades, has only recently advanced to the point that active fibres can be incorporated into the composites so their behaviour can be predictably controlled when the object is subjected to thermal and mechanical forces.

The technology promises exciting new possibilities for a variety of applications. Qi said that a solar panel or similar product could be produced in a flat configuration onto which functional devices can be easily installed. It could then be changed to a compact shape for packing and shipping. After arriving at its destination, the product could be activated to form a different shape that optimizes its function.

As 3D printing technology matures with more printable materials and higher resolution at larger scales, the research should help provide a new approach to creating reversible or tuneable 3D surfaces and solids in engineering like the composite shells of complex shapes used in cars, aircraft and antennas.