Spherical indentation of SiC

A. A. Wereszczak, K. E. Johanns

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

7 Scopus citations

Abstract

Instrumented Hertzian indentation testing was performed on several grades of SiCs and the results and preliminary interpretations are presented. The grades included hot-pressed and sintered compositions. One of the hot-pressed grades was additionally subjected to high temperature heat treatment to produce a coarsened grain microstructure to enable the examination of exaggerated grain size on indentation response. Diamond spherical indenters were used in the testing. Indentation load, indentation depth of penetration, and acoustic activity were continually measured during each indentation test. Indentation response and postmortem analysis of induced damage (e.g., ring/cone, radial and median cracking, quasi-plasticity) are compared as a function of grain size. For the case of SiC-N, the instrumented spherical indentation showed that yielding initiated at an average contact stress 12-13 GPa and that there was another event (i.e., a noticeable rate increase in compliance probably associated with extensive ring and radial crack formations) occurring around an estimated average contact stress of 19 GPa.

Original languageEnglish
Title of host publicationAdvances in Ceramic Armor II - A Collection of Papers Presented at the 30th International Conference on Advanced Ceramics and Composites
Pages43-57
Number of pages15
Edition7
StatePublished - 2006
EventAdvances in Ceramic Armor II - 30th International Conference on Advanced Ceramics and Composites - Cocoa Beach, FL, United States
Duration: Jan 22 2006Jan 27 2006

Publication series

NameCeramic Engineering and Science Proceedings
Number7
Volume27
ISSN (Print)0196-6219

Conference

ConferenceAdvances in Ceramic Armor II - 30th International Conference on Advanced Ceramics and Composites
Country/TerritoryUnited States
CityCocoa Beach, FL
Period01/22/0601/27/06

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