Interlayer adhesion and fracture resistance of polymers printed through melt extrusion additive manufacturing process

Nahal Aliheidari, Josef Christ, Rajasekhar Tripuraneni, Siva Nadimpalli, Amir Ameli

Research output: Contribution to journalArticlepeer-review

144 Scopus citations


This study aims to establish the relationships between the process parameters, mesostructural features (interlayer neck and void sizes), and the fracture resistance of 3D printed parts. The proposed method enables the decoupling of bond quality and mesostructure effects on the overall fracture behavior. Double cantilever beam specimens of acrylonitrile butadiene styrene (ABS) were designed, printed, and fracture tested. The apparent fracture resistance (Jc,a), the interlayer fracture resistance (Jc,i), and the microstructure were characterized. The fracture results and the microscopic examinations indicate that Jc,a is strongly correlated with the process parameters through both the interlayer adhesion as well as the mesostructure. Nozzle and bed temperatures and layer height were found to have significant effects on the fracture behavior. For instance, the Jc,a increased by 38% with a 20 °C increase in the nozzle temperature. This originated from 15% increase in the interlayer fracture resistance and 23% increase in the actual fracture surface area (interlayer neck size). The quality of interlayer bond was explained in terms of temperature, pressure, and time of the process. This work quantifies the relationships between the printing process and the fracture behavior and provides novel tools and insights in the design and analysis of printed materials.

Original languageEnglish (US)
Pages (from-to)351-361
Number of pages11
JournalMaterials and Design
StatePublished - Oct 15 2018

All Science Journal Classification (ASJC) codes

  • General Materials Science
  • Mechanics of Materials
  • Mechanical Engineering


  • 3D printing
  • Additive manufacturing
  • Fracture resistance
  • Fused deposition modeling
  • Interlayer adhesion
  • Process parameters


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