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

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

doi:10.1111/jace.20327

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

Journal Article · Fri Dec 20 00:00:00 EST 2024 · Journal of the American Ceramic Society

DOI:https://doi.org/10.1111/jace.20327· OSTI ID:2538334

^[1]; Jones, Kris V. ^[1]; Ghezawi, Emily F. ^[1]; ^[1]; ^[1]

Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

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, K_Ic. In this study, attention was devoted to K_Ic measurement using net-shape chevron-notched bend bars that were VPP-processed and the examination of whether valid K_Ic measurement could occur by testing them. Further, 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 K_Ic because of continuing violations of other prerequisites needed for valid K_Ic testing.

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 2538334

Alternate ID(s):: OSTI ID: 2514524

Journal Information:: Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 4 Vol. 108; ISSN 0002-7820

Publisher:: American Ceramic SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Related Subjects

36 MATERIALS SCIENCE
alumina
characterization
fracture mechanics/toughness
manufacturing

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

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References (8)

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