About this Abstract |
| Meeting |
2026 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2026)
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| Symposium
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2026 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2026)
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| Presentation Title |
Spatial Heterogeneity of the Mechanical Properties in DLP 3D Printed Polymers |
| Author(s) |
Kubra Sekmen, Xuyang Chang, Baris Telmen, Simon Hallais, Kostas Danas, Andrei Constantinescu |
| On-Site Speaker (Planned) |
Kubra Sekmen |
| Abstract Scope |
Digital light processing (DLP) is a widely used additive manufacturing technique that fabricates three-dimensional parts layer by layer through in-plane photopolymerization. However, heterogeneities in ultraviolet (UV) light exposure during printing can induce significant variations in the chemical, thermal, and mechanical properties of the printed material. The small thickness of each deposited layer leads to repeated UV exposure of previously printed layers along the build direction. In addition, within the printing plane, the UV light projected by digital micromirrors generates pixel-scale exposure heterogeneity. These effects result in nonuniform photopolymerization, heterogeneous material properties, and localized polymerization shrinkage, which together promote the formation of surface wrinkles. Such wrinkle patterns are associated with stress relaxation via buckling of a stiffer surface layer, resulting in out-of-plane deformation. This presentation discusses these mechanisms based on experimental observations from atomic force microscopy (AFM) and scanning electron microscopy (SEM), emphasizing wrinkles as precursors to cracks and dimensional inaccuracies. |
| Proceedings Inclusion? |
Undecided |