FSU 3D printing researcher

Using magnets to develop innovative technique for 3D printing

Researchers from Florida State University’s High-Performance Materials Institute and the FAMU-FSU College of Engineering have developed and investigated a new technique for 3D printing that could produce much stronger materials that could be used in a variety of engineering applications.

fiber alignment

In a paper published in the journal Additive Manufacturing, recent engineering doctoral graduate Mahuparna Roy and Associate Professor of Industrial and Manufacturing Engineering Tarik Dickens showed the possibility of using magnetic fields near a 3D printer to change the alignment of fibers inside an object as it was being printed. This tweak in the mechanical properties of the material could greatly improve its overall quality and strength. Dickens, the paper’s corresponding author, calls it “magneto-assisted printing.”

3D-printed materials are not strong on their own because they’re just plastic layers sitting on top of each other,” said Roy, the paper’s lead author. “The gap in the research world is to improve mechanical properties. With improved mechanical properties, you could create solutions for any kind of application, depending on what that particular application requires.”

 

The new technique

3D printing sometimes adds fibers made from various materials to the plastic or other substances used in printing, a technique that can improve the strength of the finished piece. When those fibers come out of a nozzle, they are oriented parallel to the direction of the flow from that nozzle. But by applying a magnetic field near the printer, the researchers were able to create objects with fibers oriented perpendicular to the nozzle’s flow.

magnetic field

The alignment of fibers inside an object can give it certain useful properties, for example, more strength or electrical conductivity. Along with showing the possibility of this new technique for fiber alignment, the research also examined how different flow rates, magnetic field strength and the shapes of nozzles affected the ability to change the fiber alignment. A theoretical model developed by Bryan Quaife, assistant professor in the FSU Department of Scientific Computing, was used to study the process regime of the assisted flow-geometry.

The study found that the more viscous the printing substance, the stronger the required magnetic field for realigning the magnetic fibers. The experiments also seemed to show that as the material is moved through the nozzle faster, the less the interior fibers will be realigned.

 

Further developments

The research showed the possibility of using this technique for a material with low viscosity, so future investigations could study the process with a more viscous material that requires a stronger magnetic field to realign the interior fibers, Roy said. Mechanical tests of the finished 3D-printed product would also be helpful.

There are still plenty of gaps that need to be addressed in terms of what materials can be used and what printers can be used in conjunction with them,” Roy said. “In this work, we’re talking about using plastics with metal particles in them. We’re combining the two major groups of 3D-printing materials to make a new material that gives you added functionality when it comes to making anything else.”

Co-authors of this study include postdoctoral researcher Phong Tran. This work was supported by the National Science Foundation.

 

Featured image: Madhuparna Roy, a former engineering doctoral student and the lead author of a paper that showed the possibility of using magnets to realign fibers inside a material being used for 3D printing.

 

Source: Florida State University


Leggi anche

BAE Systems, azienda britannica del settore aerospaziale, della difesa e della sicurezza, utilizza la stampa 3D FDM di Stratasys per implementare un’iniziativa chiamata “La fabbrica del futuro”. Nello stabilimento produttivo di Samlesbury (Lancashire, UK) la società ha creato un impianto dotato di soluzioni tecnologiche di ultima generazione, che opera con una modalità di connessione integrata inedita, combinandosi senza interruzioni con l’elemento umano. …

Leggi tutto…

La natura produce spesso compositi in fibra come il legno, gli steli delle piante, i gusci chitinosi e le tele di ragno, utilizzando principi costruttivi che richiedono poco materiale ed energia. Da questi processi di produzione naturale, si può prendere ispirazione per progettare e produrre compositi rinforzati con fibre sostenibili a base biologica, che sono molto richiesti perché vantano proprietà meccaniche paragonabili a quelle dei compositi in fibra di vetro. …

Leggi tutto…

L’Università del Maine Advanced Structures and Composites Center (ASCC) ha presentato BioHome3D, la prima casa stampata in 3D realizzata con materiali compositi a base biologica. Il progetto ha potuto contare su un finanziamento del programma Hub and Spoke del Dipartimento dell’Energia degli Stati Uniti….

Leggi tutto…

I ricercatori dell’ingegneria North Carolina State University hanno sviluppato un materiale composito autorigenerante che consente alle strutture di aggiustarsi da sole in posizione, senza dover essere rimosse dal servizio. Questa tecnologia potrebbe essere in grado di prolungare notevolmente la vita media di alcuni componenti strutturali, tra cui le pale delle turbine eoliche e le ali degli aerei….

Leggi tutto…