A VISCOELASTIC MODEL FOR EVALUATING EXTRUSION-BASED PRINT CONDITIONS
By:
Duty, Chad E; Ajinjeru, Christine; Kishore, Vidya; Compton, Brett; Hmeidat, Nadim; Chen, Xun ; Liu, Peng ; Hassen, Ahmed A; Lindahl, John M; Kunc, Vlastimil
Page Number:
495-506
Book Title:
Solid Freeform Fabrication Symposium 2017: Proceedings of the 28th International Solid Freeform Fabrication Symposium - An Additive Manufacturing Conference
Publication Date:
August 2017
Publisher Location:
University of Texas at Austin, Texas, United States of America
Conference Name:
Solid Freeform Fabrication Symposium
Conference Location:
Austin, Texas, United States of America
Conference Sponsor:
University of Texas
Abstract
Extrusion-based printing systems have improved significantly over the past several years, allowing for higher throughput, higher temperatures, and larger components. At the same time, advanced materials are being introduced on the market that can provide improved performance over a range of operating conditions. Often these materials incorporate fiber reinforcements, reactive resins, and additives to control reaction kinetics, flow rheology, or thermal stability. This study presents a general framework for evaluating the printability of various candidate materials based on a basic viscoelastic model. The model addresses fundamental requirements for extrusion-based printing, including pressure-driven flow, bead formation, bead functionality, and component-level functionality. The effectiveness of this model for evaluating the impact of compositional variations and identifying appropriate processing conditions has been demonstrated for specific materials on direct write, fused filament fabrication, and large-scale extrusion platforms.
