Apparent fracture toughness estimation of additively manufactured alumina from as-printed chevron-notched test specimens

Patrick L. Snarr, Kris V. Jones, Emily F. Ghezawi, Andrew A. Wereszczak, Corson L. Cramer

Research output: Contribution to journalArticlepeer-review

Abstract

Ceramic vat photopolymerization (VPP) is a digital light processing method used to make additively manufactured green ceramic components that are then sintered. Despite the ever-advancing maturation of this method's green-state process, some of the material properties of sintered VPP-processed ceramics are still not well defined or understood. One example is Mode I fracture toughness, KIc. In this study, attention was devoted to KIc measurement using net-shape chevron-notched bend bars that were VPP-processed and the examination of whether valid KIc measurement could occur by testing them. Stable crack propagation was observed in >60% of tested samples, indicated by a smooth nonlinear transition through the measured maximum force prior to final fracture. However, their results cannot yet be responsibly referred to as KIc because of continuing violations of other prerequisites needed for valid KIc testing.

Original languageEnglish
JournalJournal of the American Ceramic Society
DOIs
StateAccepted/In press - 2024

Funding

This manuscript has been authored by UT\u2010Battelle, LLC, under contract DE\u2010AC05\u201000OR22725 with the US Department of Energy (DOE). The US government retains, and the publisher, by accepting the article for publication, acknowledges that the US government retains a nonexclusive, paid\u2010up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript or allow others to do so for US government purposes. DOE will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan ( https://www.energy.gov/doe\u2010public\u2010access\u2010plan ). The authors acknowledge Andrew Nelson at Oak Ridge National Laboratory (ORNL) for funding acquisition and scoping of this work. The authors also thank Holden Hyer and Trevor Aguirre at ORNL for their technical review of this manuscript.

Keywords

  • alumina
  • characterization
  • fracture mechanics/toughness
  • manufacturing

Fingerprint

Dive into the research topics of 'Apparent fracture toughness estimation of additively manufactured alumina from as-printed chevron-notched test specimens'. Together they form a unique fingerprint.

Cite this