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Title: Laser notching ceramics for reliable fracture toughness testing

Abstract

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.

Authors:
 [1];  [1];  [1];  [2];  [2];  [1]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. Photomachining, Inc., Pelham, NH (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1252620
Alternate Identifier(s):
OSTI ID: 1396751
Report Number(s):
LLNL-JRNL-664402
Journal ID: ISSN 0955-2219
Grant/Contract Number:  
AC52-07NA27344; AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Journal of the European Ceramic Society
Additional Journal Information:
Journal Volume: 36; Journal Issue: 1; Journal ID: ISSN 0955-2219
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; 36 MATERIALS SCIENCE; ceramics; fracture toughness; laser notching; single-edge-V notch beam; alumina

Citation Formats

Barth, Holly D., Elmer, John W., Freeman, Dennis C., Schaefer, Ronald D., Derkach, Oleg, and Gallegos, Gilbert F. Laser notching ceramics for reliable fracture toughness testing. United States: N. p., 2015. Web. doi:10.1016/j.jeurceramsoc.2015.08.021.
Barth, Holly D., Elmer, John W., Freeman, Dennis C., Schaefer, Ronald D., Derkach, Oleg, & Gallegos, Gilbert F. Laser notching ceramics for reliable fracture toughness testing. United States. doi:10.1016/j.jeurceramsoc.2015.08.021.
Barth, Holly D., Elmer, John W., Freeman, Dennis C., Schaefer, Ronald D., Derkach, Oleg, and Gallegos, Gilbert F. Sat . "Laser notching ceramics for reliable fracture toughness testing". United States. doi:10.1016/j.jeurceramsoc.2015.08.021. https://www.osti.gov/servlets/purl/1252620.
@article{osti_1252620,
title = {Laser notching ceramics for reliable fracture toughness testing},
author = {Barth, Holly D. and Elmer, John W. and Freeman, Dennis C. and Schaefer, Ronald D. and Derkach, Oleg and Gallegos, Gilbert F.},
abstractNote = {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.},
doi = {10.1016/j.jeurceramsoc.2015.08.021},
journal = {Journal of the European Ceramic Society},
number = 1,
volume = 36,
place = {United States},
year = {2015},
month = {9}
}

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