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Crack-Tip Toughness from Vickers Crack-Tip Opening Displacements for Materials with Strongly Rising R-Curves

2011; Wiley; Volume: 94; Issue: 6 Linguagem: Inglês

10.1111/j.1551-2916.2010.04329.x

1551-2916

Stefan Fünfschilling, T. Fett, R. Oberacker, Michael J. Hoffmann, Gerold A. Schneider, Paul Becher, Jamie J. Kruzic,

Welding Techniques and Residual Stresses

Journal of the American Ceramic SocietyVolume 94, Issue 6 p. 1884-1892 Crack-Tip Toughness from Vickers Crack-Tip Opening Displacements for Materials with Strongly Rising R-Curves Stefan Fünfschilling, Corresponding Author Stefan Fünfschilling Institut für Keramik im Maschinenbau, Universität Karlsruhe, Karlsruhe 76131, Germany†Author to whom correspondence should be addressed. e-mail: [email protected]Search for more papers by this authorTheo Fett, Theo Fett Institut für Keramik im Maschinenbau, Universität Karlsruhe, Karlsruhe 76131, GermanySearch for more papers by this authorRainer Oberacker, Rainer Oberacker Institut für Keramik im Maschinenbau, Universität Karlsruhe, Karlsruhe 76131, GermanySearch for more papers by this authorMichael J. Hoffmann, Michael J. Hoffmann Institut für Keramik im Maschinenbau, Universität Karlsruhe, Karlsruhe 76131, GermanySearch for more papers by this authorGerold A. Schneider, Gerold A. Schneider Institut für keramische Hochleistungswerkstoffe, Technische Universität Hamburg—Harburg, Hamburg 21073, GermanySearch for more papers by this authorPaul F. Becher, Paul F. Becher Metals and Ceramics Division, ORNL, Oak Ridge, Tennessee 37831–6068Search for more papers by this authorJamie J. Kruzic, Jamie J. Kruzic Materials Science, School of Mechanical, Industrial, and Manufacturing Engineering, Oregon State University, Corvallis, Oregon 97331Search for more papers by this author Stefan Fünfschilling, Corresponding Author Stefan Fünfschilling Institut für Keramik im Maschinenbau, Universität Karlsruhe, Karlsruhe 76131, Germany†Author to whom correspondence should be addressed. e-mail: [email protected]Search for more papers by this authorTheo Fett, Theo Fett Institut für Keramik im Maschinenbau, Universität Karlsruhe, Karlsruhe 76131, GermanySearch for more papers by this authorRainer Oberacker, Rainer Oberacker Institut für Keramik im Maschinenbau, Universität Karlsruhe, Karlsruhe 76131, GermanySearch for more papers by this authorMichael J. Hoffmann, Michael J. Hoffmann Institut für Keramik im Maschinenbau, Universität Karlsruhe, Karlsruhe 76131, GermanySearch for more papers by this authorGerold A. Schneider, Gerold A. Schneider Institut für keramische Hochleistungswerkstoffe, Technische Universität Hamburg—Harburg, Hamburg 21073, GermanySearch for more papers by this authorPaul F. Becher, Paul F. Becher Metals and Ceramics Division, ORNL, Oak Ridge, Tennessee 37831–6068Search for more papers by this authorJamie J. Kruzic, Jamie J. Kruzic Materials Science, School of Mechanical, Industrial, and Manufacturing Engineering, Oregon State University, Corvallis, Oregon 97331Search for more papers by this author First published: 16 February 2011 https://doi.org/10.1111/j.1551-2916.2010.04329.xCitations: 17 J. Rödel—contributing editor This work was financially supported by the National Science Foundation CAREER award #0547394 and the Deutsche Forschungsgemeinschaft DFG for financing parts of this work within the SFB 483. Read the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onEmailFacebookTwitterLinkedInRedditWechat Abstract Accurate measurements of the intrinsic crack-tip toughness, KI0, are essential to understanding the strength and toughness of bridging ceramics. Furthermore, even the most carefully made R-curve measurements cannot accurately assess this initial toughness point. In this manuscript, both rigorous and approximate methods are proposed for determining KI0 from crack-tip opening displacement (COD) measurements on Vickers indent cracks for materials with steeply rising R-curves. Such approaches are attractive because of the relative ease of producing indentation cracks and analyzing the CODs; further, the latter method is of particular interest because it saves considerable computational effort. Both the advantages and limitations of the proposed methods are discussed. Finally, based on applying the above methods to three Si3N4 ceramics, it was concluded that there is a common crack-tip toughness of KI0≈2.2±0.3 MPa·√m. References 1 J. J. Kruzic, R. L. Satet, M. J. Hoffmann, R. M. Cannon, and R. O. Ritchie, "The Utility of R-Curves for Understanding Fracture Toughness-Strength Relations in Bridging Ceramics," J. Am. Ceram. Soc., 91, 1986–94 (2008). 2 T. Fett, S. Fünfschilling, M. J. Hoffmann, R. Oberacker, H. Jelitto, and G. A. 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