Procedural Aspects of the Wedge Splitting Method to Measure the Fracture Energy of Ceramic Materials
To study the fracture energy of materials, the stable crack propagation must be observed during the test. To this end, an appropriate method, particularly in the case of large samples, is the wedge splitting method. By this method, the test machine stores less elastic energy, facilitating stable propagation. The materials tested in this study were mortars with sand:cement ratios of 2:1 and 3:1. Two types of samples were prepared: one with a notch and grooves produced with a diamond disk and the other with notch and grooves produced directly during molding of the mortar. The crack moved easily along an imaginary vertical plane defined by the grooves. The methodology proved sensitive to the material’s microstructure, modified here by varying its formulation. High sensitivity was also found in relation to the shape of the tip of the notch, whether V-shaped or square. In the material studied here, the values of fracture energy varied from 23 to 56 J.m-2.
António Torres Marques, António Fernando Silva, António Paulo Monteiro Baptista, Carlos Sá, Fernando Jorge Lino Alves, Luís Filipe Malheiros and Manuel Vieira
S. Ribeiro et al., "Procedural Aspects of the Wedge Splitting Method to Measure the Fracture Energy of Ceramic Materials", Materials Science Forum, Vols. 587-588, pp. 882-886, 2008