An easy procedure for precracking ceramic specimens is proposed in this paper. The method is based on the three-point bending of a sandwich formed by a ceramic beam inserted between two steel beams. Theoretical features of this procedure are analyzed on the basis of beam theory and fracture mechanics arguments. Crack length can be controlled by the initial saw cut length and by the relative stiffnesses of the ceramic and metal beams. This precracking procedure was applied to two different alumina ceramics. Straight-through sharp cracks with controlled length were proved to be easily introduced and the obtained crack lengths were in good agreement with theoretical predictions. © 1998 Elsevier Science Ltd. All rights reserved.
Production of Sharp Cracks in Ceramic Materials by Three-Point Bending of Sandwiched Specimens
Bosetti, Paolo;Dal Maschio, Roberto;Sglavo, Vincenzo Maria
1998-01-01
Abstract
An easy procedure for precracking ceramic specimens is proposed in this paper. The method is based on the three-point bending of a sandwich formed by a ceramic beam inserted between two steel beams. Theoretical features of this procedure are analyzed on the basis of beam theory and fracture mechanics arguments. Crack length can be controlled by the initial saw cut length and by the relative stiffnesses of the ceramic and metal beams. This precracking procedure was applied to two different alumina ceramics. Straight-through sharp cracks with controlled length were proved to be easily introduced and the obtained crack lengths were in good agreement with theoretical predictions. © 1998 Elsevier Science Ltd. All rights reserved.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione
