ADDITIVE PHYSICS & EXPERIMENTAL METROLOGY
Form Under Manufacturing
A CAD model represents Platonic perfection: perfectly planar surfaces, zero-thickness boundary fillets, and uniform isotropic assumptions. In additive manufacturing, thermodynamic physics takes over: concentrated laser energy generates 2000°C melt pools, rapid solidification (exceeding 1,000,000 K/s) triggers anisotropic shrinkage, and residual elastic strain warps overhangs upon substrate release.
Signature Interactive Instrument · 10 & 11
Form Under Manufacturing
NIST AM Bench: Designed CAD vs. Physical CT Scan Thermal Deviation
Inconel 625 (Nickel-Chromium Superalloy)
Nominal (0.00mm)Max Sag (+0.68mm)
PHYSICS EXPERIMENT
NIST AMB2022-01 Nickel Superalloy IN625 Overhang
Laser Powder Bed Fusion (LPBF) / EOS M290
MAX DEVIATION
+0.68 mm
THERMAL SHRINKAGE
1.42%
RESIDUAL STRESS
480 MPa
MELT POOL TEMP
2180°C
Printability Heuristics & Failure Modes:
Overhang Angle Threshold>= 45° from horizontal
Risk: Downward dross formation, powder burn-through, rough underside
Minimum Wall Thickness>= 0.6mm (2x laser beam spot size)
Risk: Delamination, porosity, and thermal buckling
NIST AM Bench Experimental Records (2)
Controlled physical benchmark measurements archived for computational simulation validation
AM Bench 2022STEP CAD Solid
NIST AMB2022-01 Nickel Superalloy IN625 Overhang
Material: Inconel 625 (Nickel-Chromium Superalloy) · Process: Laser Powder Bed Fusion (LPBF) / EOS M290
Thermodynamic Transformation Chain:
Laser Heating
Intense localized Gaussian energy density creates a keyhole melt pool → Vapor depression and powder recoil pressure
Rapid Solidification
Cooling rates exceed 10^6 K/s, creating fine cellular dendritic microstructure → Volumetric contraction pulls adjacent unsolidified powder inward
Substrate Release
EDM wire cutting releases substrate constraint, unleashing trapped elastic strain → Part curls upward by +0.52mm along longitudinal axis
AM Bench 2025STEP CAD Solid
NIST AMB2025 Ti-6Al-4V Triply Periodic Minimal Surface
Material: Ti-6Al-4V Grade 23 (Titanium Alloy) · Process: Electron Beam Melting (EBM) / Arcam Q10
Thermodynamic Transformation Chain:
Phase Change & Melting
Electron beam beam-powder interaction in high vacuum → Semi-sintered titanium particles cling to downward-facing gyroid saddles
Substrate Release
Uniform thermal dissipation through connected TPMS pore network → Near-zero macroscopic warpage due to omnidirectional stress distribution
JURALOGIUM · JURISPRUDENCE
Additive Manufacturing IP, 3D File Copyright & Design Patents
Related cross-corpus research node: 3D file distribution rights and cultural scan licensing