About this Abstract |
Meeting |
2025 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2025)
|
Symposium
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2025 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2025)
|
Presentation Title |
A Compact In-Situ Artifact for Real-Time Monitoring 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 still lacks an inexpensive, real-time gauge linking process drift to mechanical reliability. We present a compact in-situ artifact: two arms joined by a 0.8 mm ligament that fractures mid-build when longitudinal residual stress equals the alloy’s ultimate tensile strength. The break ejects a visible powder plume captured by any webcam; counting the fracture layer instantly reveals peak residual stress using a finite-element calibration curve. Thirty Inconel 718 coupons printed across an EOS M290 plate broke reproducibly within layers 104–107, mirroring subtle location-dependent strength shifts in co-fabricated tensile bars. Systematic hatch-angle and laser-power sweeps produced cosine-like and monotonic break-layer trends. Controlled experiments confirm accuracy across plate position, orientation, and power loss. The coupon occupies 6 mm × 61.5 mm, adds minimal print time, and needs no auxiliary sensors, enabling routine parameter qualification and laser-health monitoring in production LPBF in standard production builds. |
Proceedings Inclusion? |
Planned: Post-meeting proceedings |