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Influence of experimental variables on fracture toughness determined on SEVNB in three points bending. Mullite a casestudy

AuthorsGarcía-Prieto, Ana ; Baudín de la Lastra, Carmen
KeywordsNotch-Root Radius
Controlled Crack-Growth
Issue Date2012
CitationJOURNAL OF THE EUROPEAN CERAMIC SOCIETY Volume: 32 Issue: 16 Pages: 4241-4248
AbstractThe effect of testing variables on toughness of single edge "V" notched beams (4 mm x 6 min x 50 mm, alpha = 0.6) of a fine grained mullite (d(50) = 0.7 +/- 0.5 mu m) in three points bending (span = 40 nun) is analysed. Mullite was selected as case material because it presents flat R-curve and subcritical crack propagation. Stable fracture was reached by using the CMOD as control variable (0.001 and 0.018 mm/min). Results for stable test and unstable displacement (0.05 mm/min) controlled tests are analysed. K-IC has been calculated from maximum loads, K-ICp, and from the total fracture energy determined in stable tests, K-IC gamma. The fact that for materials with flat R-curve both K-IC values are coincident has been used as criterion for adequacy of the test. Stable fracture at high deformation rates is required to fulfil K-ICp = K-IC gamma. Under such conditions, an intrinsic K-IC = 0.86 +/- 0.06 MPa m(1/2), less than one half of those previously reported has been obtained. (C) 2012 Elsevier Ltd. All rights reserved.
Publisher version (URL)DOI: 10.1016/j.jeurceramsoc.2012.06.018
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