Evaluation of new technique to estimate yield stress in brittle materials via spherical indentation testing

B. L. Hackett, A. A. Wereszczak, G. M. Pharr

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

3 Scopus citations

Abstract

Instrumented indentation testing provides the means to measure many mechanical properties and characteristics of materials. One such mechanical property that can be ascertained from indentation testing is a material's yield stress, the stress corresponding to the onset of permanent deformation. In britde materials such as ceramics and glasses, traditional testing methods fall short of precisely establishing the yield stress. A new technique to estimate the yield stress is under development and described here. It utilizes the sensing and interpreting of the initiation of a residual surface impression through the change of the instantaneous contact-stiffness3/load (S3/P) as measured by load and depth-sensing indentation with spherical indenters. Several brittle materials (borosilicate, soda-lime silicate, and bulk metallic glass) are evaluated, and the test method and manner of interpreting the yield-like response through S3/P are described.

Original languageEnglish
Title of host publicationCeramic Engineering and Science Proceedings
EditorsJerry LaSalvia, Palani Balaya, Tatsuki Ohji, Zhengyi Fu, Jonathan Salem, Peter Mechnich, Mihails Kusnezoff, Dietmar Koch, Narottam Bansal
PublisherAmerican Ceramic Society
Pages61-71
Number of pages11
Edition2
ISBN (Electronic)9781119519645, 9781119543268, 9781119543305
StatePublished - 2019
Event42nd International Conference on Advanced Ceramics and Composites, ICACC 2018 - Daytona Beach, United States
Duration: Jan 21 2018Jan 26 2018

Publication series

NameCeramic Engineering and Science Proceedings
Number2
Volume39
ISSN (Print)0196-6219

Conference

Conference42nd International Conference on Advanced Ceramics and Composites, ICACC 2018
Country/TerritoryUnited States
CityDaytona Beach
Period01/21/1801/26/18

Funding

Research sponsored by the US Army Research Office (US ARO) under Grant No. W911NF-15-1-0614 through the University of Tennessee - Knoxville. The authors thank US ARO's D. Stepp for financial support. The authors would also like to thank Oak Ridge National Laboratory's R. Parten and T. Geer for specimen machining and polishing, respectively.

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