Correlation of the indentation fracture resistance measured using high-resolution optics and the fracture toughness obtained by the single edge-notched beam (SEPB) method for typical structural ceramics with various microstructures

摘要

The standardized SEPB method and an accurate IF technique recently developed by the authors were employed in order to clarify the correlation of K-IC and K-IFR for ceramics with various microstructures. Both KIFR calculated using Miyoshi's equation and Niihara's equation were roughly proportional to K-IC but the correlation was incomplete. K-IFR calculated using Miyoshi's equation has a tendency to exhibit slightly smaller values than their K-IC. In contrast, the relation between K-IFR and K-IC was reversed when Niihara's equation was used for the calculation of K-IFR. (C) 2016 Elsevier Ltd and Techna Group S.r.l. All rights reserved.