Preparation and characterization of PμSL microfiber. (a) The tensile was fabricated by stereolithography, and the working half and clamping half was concurrently fabricated by a single publicity technique. (b) Schematic of the tensile course of. (c) Additional clamping sections had been designed to extend the stiffness. (d) The SEM picture of the fabricated tensile pattern. Credit: International Journal of Extreme Manufacturing (2022). DOI: 10.1088/2631-7990/ac93c2
Projection micro stereolithography (PμSL) has emerged as a robust three-dimensional (3D) printing approach for manufacturing polymer buildings with micron-scale excessive decision at excessive printing velocity, which allows the manufacturing of personalized 3D microlattices with function sizes all the way down to a number of microns. However, the mechanical properties of as-printed polymers weren’t systemically studied on the related size scales, particularly when the function sizes step into micron/sub-micron stage, limiting its dependable efficiency prediction in micro/nanolattice and different metamaterial purposes.
Based on self-developed in situ micro-mechanical platform, Prof. Yang Lu from City University of Hong Kong demonstrates that projection micro-stereolithography (PμSL)-printed microfibers might grow to be stronger and considerably extra ductile with diminished measurement starting from 20 μm to 60 μm, displaying an apparent size-dependent mechanical habits, during which the dimensions decreases to twenty μm with a fracture pressure as much as ~100% and fracture power as much as ~100 MPa.
Such measurement impact allows the tailoring of the fabric power and stiffness of PμSL-printed microlattices over a broad vary, permitting to manufacture the microlattice metamaterials with desired/tunable mechanical properties for varied structural and practical purposes.
Incorporating the dimensions impact of the PμSL printed polymer permits us to acquire microlattice with completely different mechanical properties but the identical topography and relative density. The modulus of the microlattice with 20 μm is measured to be ~87 MPa about twice in contrast with that of the lattice with struts diameter of 60 μm (~43 MPa). After the lattices had been yielded, the stress of the lattice with 20 μm struts elevated with the pressure. This could also be attributed to the pressure hardening section of the micro-sized struts. While the lattice with a diameter of 60 μm reveals typical stress curves of brittle supplies.
This end result reminds us to think about the dimensions of the polymer when designing microlattice metamaterials. Such size-dependent mechanical habits of PμSL-printed acrylate-based resin buildings allows the tailoring of the fabric power and stiffness of microlattice models over a variety, enabling the rational fabrication of microlattice scaffolds with desired/programmable mechanical properties for the event of novel micro/nano-lattice mechanical metamaterials.
“Nowadays, vat photopolymerization 3D printing applied sciences, similar to PµSL, can present a wonderful mixture of ultrahigh printing decision and enormous printing measurement, paving the paths for geometrically advanced elements with well-defined hierarchical buildings for structural and practical metamaterials,” explains Professor Lu Yang within the Department of Mechanical Engineering, who led this analysis.
“A deep understanding of the mechanical properties of PμSL-printed polymer at small size scales will speed up the event of superior mechanical metamaterials similar to micro/nanolattice supplies with unprecedent efficiency. Size-dependent mechanical properties of supplies has been at all times the central focus of my group’s analysis. It additionally evokes us to pay extra consideration to make the most of such measurement results for designing superior mechanical metamaterials with crucial options steps into micro/nanoscales.”
The analysis was printed within the International Journal of Extreme Manufacturing.
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More info:
Wenqiang Zhang et al, Tailoring mechanical properties of PμSL 3D-printed buildings by way of measurement impact, International Journal of Extreme Manufacturing (2022). DOI: 10.1088/2631-7990/ac93c2
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International Journal of Extreme Manufacturing
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Creating stronger and extra ductile microlattice supplies with diminished unit sizes (2022, October 14)
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