Paper Number
AM8 

Session
Additive Manufacturing

Title
Nonisothermal welding in fused filament fabrication

Presentation Date and Time
October 15, 2018 (Monday) 2:20

Track / Room
Track 3 / Bellaire

Authors (Click on name to view author profile)

  1. Coasey, Keith (University of Delaware, Materials Science and Engineering)
  2. Hart, Kevin R. (U.S. Army Research Laboratory, Materials and Manufacturing Sciences Division)
  3. Wetzel, Eric (U.S. Army Research Laboratory, Materials and Manufacturing Sciences Division)
  4. Edwards, David (University of Delaware, Department of Mathematical Sciences)
  5. Mackay, Michael E. (University of Delaware, Materials Science & Chemical and Biomolecular Engineering)

Author and Affiliation Lines (in printed abstract book)
Keith Coasey1, Kevin R. Hart2, Eric Wetzel2, David Edwards3, and Michael E. Mackay4
1Materials Science and Engineering, University of Delaware, Newark, DE; 2Materials and Manufacturing Sciences Division, U.S. Army Research Laboratory, Aberdeen, MD; 3Department of Mathematical Sciences, University of Delaware, Newark, DE; 4Materials Science & Chemical and Biomolecular Engineering, University of Delaware, Newark, DE

Speaker / Presenter 
Coasey, Keith

Text of Abstract
Fused filament fabrication (FFF), sometimes called material extrusion (ME) offers an alternative option to traditional polymer manufacturing techniques to allow the fabrication of objects without the need of a mold or template. However, these parts are limited in the degree to which the welding interface is eliminated post deposition, resulting in a decrease in the interlaminar fracture toughness relative to the bulk material. Here we have utilized reptation theory under nonisothermal conditions to predict the development of healing over time, from the rheological and thermal properties of Acrylonitrile-Butadiene-Styrene (ABS). ABS is rheologically complex and acts as a colloidal suspension and as such considerations had to made for the time of relaxation of the matrix which is important in predicting the degree of interfacial healing. The nonsiothermal healing model developed is then successfully compared to experimental interlaminar fracture experiments at variable printing temperatures, allowing future optimization of the process to make stronger parts.