Beyond intuitive microstructures for 3D printed composites
March 8 – 12, 2020
3D printed composites marry the worlds of lightweight and tough composite materials with the detailed and programmable geometries of 3D printing. This combination gives rise to a new class of interesting grand challenges to deliver on the net promise of the field. A summary of the current state of 3D printed composites will be provided with a focus on stereolithography (SLA) printing of filled resins that offers high resolution and speed. SLA printing of ceramic filled resins presents many challenges include dispersion issues, poor light penetration, particle alignment, and viscosity handling. Here we offer routes to SLA print resin systems with doped ceramics to exploit magnetic fields to induce programmable alignment within every voxel of a printed 3D part. We offer a vision for implementing numerical simulations of anticipated loads to understand expected internal stress states that inform our design of optimum microstructures within printed composite parts. In addition to optimizing mechanics, we have investigated tuning conduction pathways within 3D printed thermally conductive dielectric parts that have application in the realm of radiofrequency (RF) electronics. Finally, we have found surprising mechanical enhancements through the use of non-intuitive microstructures that can’t be simply predicted through finite element analysis of parts under expected loads. These new classes of reinforcing microstructures improve the toughness of printed composites significantly beyond the conventional wisdom for “optimal” microstructure designs
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Randall Erb, Chunzhou Pan, Jessica Faust, and Robert Zando, "Beyond intuitive microstructures for 3D printed composites" in "Innovative Materials For Additive Manufacturing (IMAM)", Daniel Schmidt, Luxembourg Institute of Science and Technology, Luxembourg Nikhil Gupta, New York University, USA Chua Chee Kai, NTU, Singapore Brett G. Compton, University of Tennessee, USA Eds, ECI Symposium Series, (2020). https://dc.engconfintl.org/imam/9