Material Detail

3D Printing Feedstock Physics: Sintering, Polymerization & Extrusion is an open-access engineering instructional module and reference text published by Prep4Uni.Online. This module provides a rigorous, undergraduate-to-postgraduate treatment of the governing thermodynamic phase transformations, mass transport kinetics, and rheological mechanics across liquid, powder, and solid additive manufacturing feedstocks.

Aligned with international engineering accreditation standards under the Washington Accord (WA1–WA5) and EUR-ACE frameworks, this resource models the continuum and molecular mechanics governing consolidation in photopolymer vats, sintering powder beds, and thermoplastic liquefier nozzles.

Key Mathematical & Physical Topics Covered:

• Liquid Feedstock Kinetics: Modeling Beer-Lambert photon attenuation, free-radical photoinitiation, Jacobs' cure depth relationship, and Flory-Stockmayer critical gelation conversion thresholds.

• Powder Consolidation & Sintering: Excess surface-energy-driven chemical potential gradients via the Gibbs-Thomson equation, Frenkel viscous neck growth kinetics, and atomic mass transport mechanisms across surface, grain boundary, and volume lattice diffusion pathways.

• Solid Filament Rheology: Non-Newtonian pseudoplastic melt extrusion through circular dies, Weissenberg-Rabinowitsch-Mooney wall shear rate corrections, Ostwald-de Waele power-law pressure drop calculations, and Williams-Landel-Ferry (WLF) molecular reptation welding across deposited bead interfaces above the glass transition temperature (Tg).

• Interactive Simulation & Assessment: An embedded client-side HTML5 thermodynamic phase-change and melt rheology simulation engine, complemented by a three-tier assessment suite containing 8 foundational concept questions, 7 industrial failure-analysis cases, and 6 quantitative engineering worked examples with complete step-by-step solutions.

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