About this Abstract |
| Meeting |
2025 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2025)
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| Symposium
|
2025 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2025)
|
| Presentation Title |
An In-situ Test Artifact for Real-time Monitoring of Properties in Laser Powder Bed Fusion |
| Author(s) |
Sina Nejati Eghteda, Albert C. To |
| On-Site Speaker (Planned) |
Sina Nejati Eghteda |
| Abstract Scope |
Laser Powder Bed Fusion demands an in-process signal that says, with mechanical authority, whether the build is drifting. We introduce a micro-coupon—two cantilevered arms bridged by a 0.8 mm ligament—that snaps as soon as accumulated longitudinal residual stress reaches the material’s ultimate tensile strength. The single fracture layer releases a visible powder disturbance that any viewer can register, delivering an instant, integer-layer metric. Thirty Inconel 718 coupons spread across a build plate fractured within layers 104–107, mapping location-dependent stress gradients that mirrored strength shifts in co-printed tensile bars. Scan-angle tests produced a cosine-governed delay, and deliberate 40 W laser-power drops postponed fracture by up to four layers. The finite-element simulation reproduced each stress trajectory, anchoring the break-layer calibration. Consuming 6 mm × 61.5 mm and with a minimal print time, the artifact enables low-cost parameter qualification and machine-health monitoring. Its output streamlines quality assurance across builds. |
| Proceedings Inclusion? |
Planned: Post-meeting proceedings |