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Sandwiched‐Beam Procedure for Precracking Brittle Materials
Author(s) -
Sglavo Vincenzo M.,
Bosetti Paolo,
Trentini Elena,
Ceschini Michele
Publication year - 1999
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1999.tb02077.x
Subject(s) - materials science , brittleness , composite material , bar (unit) , beam (structure) , fracture toughness , molybdenum disilicide , bending , composite number , graphite , toughness , structural engineering , metallurgy , molybdenum , physics , meteorology , engineering
A technique for precracking brittle materials is presented. This procedure, which is called the sandwiched‐beam (SB) technique, allows the production of sharp through‐thickness cracks with predetermined length in specimens with a rectangular section. A bar, in which an initial notch is produced by using a conventional saw, is inserted between two supporting beams and the sandwich assembly is loaded in three‐point bending. Conditions can be defined that allow the stable propagation of a sharp flaw from the notch as the applied load is increased. Then, the cracked bar can be used to determine the fracture toughness. The SB technique is applied to different brittle materials, including soda‐lime‐silica glass, alumina, Si 3 N 4 , a SiC w ‐Si 3 N 4 composite, graphite, a Ti‐Al intermetallic, and Carrara marble.