About this Abstract |
Meeting |
2022 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2022)
|
Symposium
|
2022 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2022)
|
Presentation Title |
Effects of UV Overcuring in Multi-Material Jetting Additive Manufacturing |
Author(s) |
Lindsey Bezek, Christopher Williams |
On-Site Speaker (Planned) |
Lindsey Bezek |
Abstract Scope |
Photopolymer material jetting (MJ) presents designers the opportunity to tune material properties on a voxel-by-voxel basis to fabricate high-resolution, multi-material parts; however, it is mainly constrained to prototyping use. Indiscriminate dosing of ultraviolet (UV) irradiation in MJ systems could cause variations in parts' mechanical properties depending on part design and build layout. This study quantifies how UV irradiation affects mechanical properties. Leveraging physical MJ system measurements, a process model is presented that predicts accumulated exposure in batch-printed parts of dissimilar build heights for different materials and surface finishings. Experimental testing enables correlation of parts' total exposure to mechanical properties. Adjacently printing parts 50 mm taller than a VeroWhitePlus part of interest causes a 29,500% increase in surface exposure, corresponding to a 12.6% increase in tensile strength. Connecting accumulated exposure to mechanical performance enables improved strategies for build layout and process modification to ensure consistency of UV dosage and mechanical performance. |
Proceedings Inclusion? |
Definite: Post-meeting proceedings |