EVALUATION OF FRACTURE TOUGHNESS OF SINTERED SILICA-NICKEL NANOCOMPOSITES

A.K.Pramanick

Abstract: The micro-Vickers indentation technique is limited to a small area of the specimen surface. It provides a sort of local fracture toughness value, limited to a small portion of the material. But, due to the simplicity of the micro- Vickers indentation test, there has been a steadily increasing interest in its applications. It has been established that classifying on the indentation load, two different types of cracks may form in the Vickers indentation. One type is the Palmqvist crack, while the other is the median type crack which forms in a half penny shape. A Niihara approach is chosen to assess the fracture toughness of silica-nickel Nanocomposites for both type of cracks found in this experiment. The important observation is that with the increase in the amount of nickel, the indentation fracture toughness is found to increased

Keywords: Micro-Vickers indentation, fracture toughness, Palmqvist crack, Median crack, Nickel, Niihara, Nanocomposites

DOI: https://doi.org/10.15623/ijret.2015.0403057