![]() The technique allows for the 3D printing of engineered materials that can be spatially programmed to achieve specific performance goals. “Rather than using magnetic or electric fields to orient fibers, we control the flow of the viscous ink itself to impart the desired fiber orientation.”Ĭompton noted that the team’s nozzle concept could be used on any material extrusion printing method, from fused filament fabrication, to direct ink writing, to large-scale thermoplastic additive manufacturing, and with any filler material, from carbon and glass fibers to metallic or ceramic whiskers and platelets. “Rotational 3D printing can be used to achieve optimal, or near optimal, fiber arrangements at every location in the printed part, resulting in higher strength and stiffness with less material,” Compton said. Collaborators included then-postdoctoral fellows Brett Compton (now Assistant Professor in Mechanical Engineering at the University of Tennessee, Knoxville), and Jordan Raney (now Assistant Professor of Mechanical Engineering and Applied Mechanics at the University of Pennsylvania) and visiting PhD student Jochen Mueller from Prof. ![]() The work, described in the journal PNAS, was carried out in the Lewis lab at Harvard. “We can now pattern materials in a hierarchical manner, akin to the way that nature builds.” Lewis is also a Core Faculty Member of the Wyss Institute for Biologically Inspired Engineering at Harvard. ![]() Lewis, Hansjorg Wyss Professor of Biologically Inspired Engineering at Harvard SEAS. “Being able to locally control fiber orientation within engineered composites has been a grand challenge,” said the study’s senior author, Jennifer A. Given the modular nature of their ink designs, many different filler and matrix combinations can be implemented to tailor electrical, optical, or thermal properties of the printed objects. Their method, referred to as “rotational 3D printing,” could have broad ranging applications. They used this additive manufacturing technique to program fiber orientation within epoxy composites in specified locations, enabling the creation of structural materials that are optimized for strength, stiffness, and damage tolerance. Paulson School of Engineering and Applied Sciences (SEAS) has demonstrated a novel 3D printing method that yields unprecedented control of the arrangement of short fibers embedded in polymer matrices. Now, a team of researchers at the Harvard John A. ![]() But reproducing the exceptional mechanical properties and complex microstructures found in nature has been challenging. Since ancient civilizations first combined straw and mud to form bricks, people have fabricated engineered composites of increasing performance and complexity. The text "Surface Texture Modulation via Buckling in Porous Technical Metamaterials" is at the bottom of the screen along with the Harvard GSD and Harvard SEAS shields.A novel 3D printing method yields unprecedented control of the arrangement of short fibers embedded in polymer matrices.(Image courtesy of Lewis Lab/Harvard SEAS)ĬAMBRIDGE, MA – Nature has produced exquisite composite materials-wood, bone, teeth, and shells, for example-that combine light weight and density with desirable mechanical properties such as stiffness, strength and damage tolerance. With changes in air pressure, the robot buckles and releases, causing it to inch forward. It is followed by video of a green robot made of porous elastomer cut at 45-degree angles and attached to an air pump. Video description: The text "Soft robotic crawler" appears on the screen. It could even be used on the soles of sneakers to change the levels of traction during walking or running." "It can change the way light is reflected, the way fluid flows, and the way sound is absorbed and reflected. "This change in the third dimension opens up a lot of possibilities for different applications," said Saurabh Mhatre, a senior research associate at GSD and co-first author of the paper. The change in surface morphology resulted in new ways for the material to behave, such as how it responds to various air pressures. Rather than cutting the holed elastomer at the usual 90-degree angle, the material was sliced at 45-degrees. Paulson School of Engineering and Applied Sciences Bertoldi Group and the GSD's Material Processes and Systems (MaP+S) Group on the effects of altering the surface texture of porous metamaterials, such as a block of elastomer. This worm-like robot is powered only by air □□ It demonstrates new research from Harvard John A.
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