EFFECT OF INDENTOR ELASTIC MODULUS ON HERTZIAN RING CRACK INITIATION IN SILICON CARBIDE

Hertzian ring cracking in two SiCs was studied as a function of the elastic property mismatch between the indentor and target. Ring crack initiation forces (RCIF) were measured using ZrO2, steel, Si3N4, Al2O3, and WC balls. The SiCs were similar; however, about 20% of the grains in one were larger t...

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Published inInternational journal of applied ceramic technology Vol. 8; no. 4; pp. 885 - 894
Main Authors Wereszczak, A A, Daloz, W L, Strong, K T, Jadaan, O M
Format Journal Article
LanguageEnglish
Published 01.01.2011
Subjects
Aluminum oxide
Ceramics
Crack initiation
Elastic constants
Fracture mechanics
Grains
Modulus of elasticity
Silicon carbide
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Summary:Hertzian ring cracking in two SiCs was studied as a function of the elastic property mismatch between the indentor and target. Ring crack initiation forces (RCIF) were measured using ZrO2, steel, Si3N4, Al2O3, and WC balls. The SiCs were similar; however, about 20% of the grains in one were larger than the largest grains in the other. Decreasing indentor stiffness resulted in lower RCIFs and initiation occurred at lower forces in the SiC containing larger grains. Using a spherical indentor with similar elastic properties as the target provided a simpler interpretation and useful and confident estimates of ring crack initiation stresses.
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ISSN:1546-542X