Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 8, Issue 42, Pages 29037-29043Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b09768
Keywords
additive manufacturing; graded materials; vat photopolymerization; function-based representations; voxel model
Funding
- University of Washington
- College of Engineering Strategic Research Initiative (University of Washington)
- Washington Research Foundation
- Research Corporation for Science Advancement
- National Science Foundation [DMR-1452726, DGE-1256082]
- Army Research Office [W911NF-15-1-0139]
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We describe an efficient method to produce objects comprising spatially controlled and graded cross-link densities using vat photopolymerization additive manufacturing (AM). Using a commercially available diacrylate-based photoresin, 3D printer, and digital light processing (DLP) projector, we projected grayscale images to print objects in which the varied light intensity was correlated to controlled cross-link densities and associated mechanical properties. Cylinder and bar test specimens were used to establish correlations between light intensities used for printing and cross-link density in the resulting specimens. Mechanical testing of octet truss unit cells in which the properties of the crossbars and vertices were independently modified revealed unique mechanical responses from the different compositions. From the various test geometries, we measured changes in mechanical properties such as increased strain-to-break in inhomogeneous structures in comparison with homogeneous variants.
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