Abstract
Interfacial fracture toughness is an important property for layered materials. However, the evaluation technique for the toughness is generally difficult. Vickers indentation test is easy, and can provide the fracture toughness using the length of a generated crack and the indentation load. In this study, we proposed sharp indentation test for fracture toughness of multilayered material with high adhesive. The possibility was experimentally confirmed using a TBC system specimen. Following results were obtained: The sharp indenter can generate a longer crack rather than using a Vickers indenter, and the generated impression was smaller. As the smaller impression, the size did not over the thickness of intermediate layer. Consequently, the force was accurately applied to the interface. Finally, the obtained toughness was confirmed to be accord with the results of DCB tests.
