Laser notching ceramics for reliable fracture toughness testing

Barth, Holly D.; Elmer, John W.; Freeman, Dennis C.; Schaefer, Ronald D.; Derkach, Oleg; Gallegos, Gilbert F.

doi:10.1016/j.jeurceramsoc.2015.08.021

Laser notching ceramics for reliable fracture toughness testing

Journal Article · Sat Sep 19 00:00:00 EDT 2015 · Journal of the European Ceramic Society

DOI:https://doi.org/10.1016/j.jeurceramsoc.2015.08.021· OSTI ID:1252620

Barth, Holly D. ^[1]; Elmer, John W. ^[1]; Freeman, Dennis C. ^[1]; Schaefer, Ronald D. ^[2]; Derkach, Oleg ^[2]; Gallegos, Gilbert F. ^[1]

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Photomachining, Inc., Pelham, NH (United States)

A new method for notching ceramics was developed using a picosecond laser for fracture toughness testing of alumina samples. The test geometry incorporated a single-edge-V-notch that was notched using picosecond laser micromachining. This method has been used in the past for cutting ceramics, and is known to remove material with little to no thermal effect on the surrounding material matrix. This study showed that laser-assisted-machining for fracture toughness testing of ceramics was reliable, quick, and cost effective. In order to assess the laser notched single-edge-V-notch beam method, fracture toughness results were compared to results from other more traditional methods, specifically surface-crack in flexure and the chevron notch bend tests. Lastly, the results showed that picosecond laser notching produced precise notches in post-failure measurements, and that the measured fracture toughness results showed improved consistency compared to traditional fracture toughness methods.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-05CH11231; AC52-07NA27344

OSTI ID:: 1252620

Alternate ID(s):: OSTI ID: 1396751

Report Number(s):: LLNL-JRNL--664402

Journal Information:: Journal of the European Ceramic Society, Journal Name: Journal of the European Ceramic Society Journal Issue: 1 Vol. 36; ISSN 0955-2219

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Related Subjects

36 MATERIALS SCIENCE
42 ENGINEERING
alumina
ceramics
fracture toughness
laser notching
single-edge-V notch beam

Laser notching ceramics for reliable fracture toughness testing

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References (17)

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